Posts from the ‘Showcases’ Category

German Specimens from My Personal Collection

I have been sorting out my vast stock of rocks recently, aiming to sell off a lot of them and get back some kind of control of things.  I have been selling liberally over on the Thunderegg Shop Facebook Group – but this has also been a chance to look through all my specimens that are not yet on the gallery and decide which ones I would keep.  And then finally upload them!  These are the ones that really caught me, including some very unusual locations and some nice specimens of more familiar ones.  Below are some of my favourite ones.

See the whole German gallery here:


Wieda Thunderegg – A Crisp Specimen From a Rare Location


Altersbach – Rarish Location Known for it’s Flaming Hydrothermal Agate.


Nesselhof Thunderegg – Candycane!


Nesselhof thunderegg – Deep Red


Drusenborn Thunderegg – Rarely Seen Solid Agate


Querbitzsch – a Beautiful Specimen of the White Ghosts of the Kaolin Mines


Waldeneck – The Classic Baden Baden Location


Gröppendorf – The ‘Other’ White Ghost of the Kaolin Mines




Hölle (Gehlberg) – one of the Quiet Relatives of the Famous Felsenschlag.


Oberhof – a Rare New Location from an Urban Building Site!


Spießberg ‘Rote Linie’ – an Unnamed Location in an area that is Being Revealed as Surprisingly Diverse.




Two Californian Tilt Eggs

Tilt thundereggs, where the horizontal bands in some agate are oriented in different directions due to the stone moving in the ground, are one of the most interesting features you can fine.  Here are two specimens showing various degrees of tilt.

Turkeytail 03

TurkeyTail Bed thunderegg. In this stone, the tilt has ‘crept’ – slowly moving and laying down bands of agate in a fan structure.


Unknown location – Possibly Middle Hauser or Potato Patch West. This one shows some dramatic events that have shattered the agate and left it to ‘freeze’ again inside a new material laid down at about 30 degrees to the original. Other half below.


Baumgartental East Side Update

Baumgartental Bed 2 Thunderegg

The above stone has been with me for a long time – a lovely little specimen from the Baumgartental East Side location (from the east side of the valley).  It is still one of the best Baumgartentals I have seen, and I have worked with quite a lot.  I have just updated the gallery with a few new stones – the best of the ones that have passed through my hands in the past few years.  And for the first time this begins to show just how changeable these stones can be.

For a long time, i was working with a distinctly different form with a far paler and more distinctly two-tone matrix.  Like this:

Baumgartental2 04

It has to be said that once i acquired a stock of these they stuck to their basic formula pretty tightly – all very similar with very reduced agate and quartz ranging from decayed mess to glitteringly brilliant.

Baumgartental2 05a

They were beautiful stones, but not the most varied, i thought, so it became a game of finding one with slightly brighter quartz maybe – or a slightly better shape.  Yes – I was even getting what you might call board!  But of course – that’s the thing about a specific batch that you acquire – dug up from one patch of ground maybe – one small area of the infinite geology of the earth . . .

Baumgartental2 06

Compare, for example, with the following:

Baumgartental2 08

Both these last two specimens are tiny – just 4.5cm across.  And maybe this also changes the rules somewhat.  At any rate, finding these small stones, the very first ones to emurge from a small batch I acquired, suddenly opened the location up again!  Jolted me out of any weird Baumgartental reverie.  There will be more of these as I slowly work through them.  And the one thing they do prove is what an amazing location Baumgartental can be!

Baumgartental2 09b

Bear Mountain Beauty


Bear Mountain, New Mexico is not a new location on the gallery, but this is the first time I have managed to track down specimens of any real quality that demonstrate what the location is capable of.  These two specimens demonstrate some interesting, not to say beautiful mineral growths and some nice mocha coloured agate.  Click here to visit the New Mexico gallery.bearmountain02

Kopfchens – Stressed and Shattered, but not so Ugly, Right?

Thunderegg36 sm

Click the image for a larger version.

These are Kopfchen thundereggs. With a few exceptions, the first batch of Kopfchens I got were somewhat on the scrappy side – tail end of a stock I think. So much so that I quickly labelled them one of the ugliest thundereggs in the world!  But I was very pleased to get a second chance with them just today. Of course, they are still almost always EXTREMELY rough and a deeply flawed thunderegg – they must have been through some dramatic stress even by the standards of German stones to end up quite this beat up. I suppose if you can’t stand cracks you won’t stand Kopfchens – but hey, I think they have an aesthetic and a character and a lot of nice colours to them, so maybe not so ugly now, right?

There will be more of these as I slowly polish through the stock – and yes, some will be for sale or swap.


True Beauty – Whistler Springs

Not a new location or anything – I just wanted to share what may be one of the most directly beautiful thundereggs I have ever seen.

Whistler Springs Thunderegg

The Dramatic Thuringia Browns – New German Locations and Others

There is definitely something magical in the soil of Thuringia.  One thunderegg after another has emerged from the ground here – all very distinctively German.  Some are quite individual like the Nesselhofs, Spießbergs and Baumgartentals (see my gallery), but sometimes they can seem remarkably similar – all following the basic structure of a brown matrix with varying amounts/sizes of embedded grains and cores of quartz and maybe thin bands of agate.   As the ornithologists have their LBJs (‘little brown jobs’), so we thunderegg hunters have our Thuringia Browns.  Telling them apart can be a nightmare and the classification chaotic.  It all sounds rather expert territory right?  Loads of dull brown rocks, right?  The sort of things only a madly dedicated egg-head could possibly go wild over, right?

Well – I’m not so sure.  If you step back from the fun and games of classifying them, these rough and ready brown thundereggs have a real charm about them.  Colourful they ain’t (sometimes anyway) and they often suffer seriously from cracking but I think they have an earthy magnificence about them.  I have just launched three more of these Thuringia Browns on my gallery, but rather than just crow over the new locations, I thought it would be rather more interesting to present a nice overview of the very best of these wonderful stones – some new, some familiar if you have explored the gallery before.

To begin with a reference point – the most famous Thuringia Brown of all and the only one to be what you could call common – the Felsenschlag.  With their winning colour scheme, they are justifiably famous, even though only a small percentage of them are of any kind of quality.

Felsenschlag Thunderegg from near Gehlberg

You can see plenty more Felsenschlags on the gallery.  Note the few grains and inclusions in the matrix – we’ll be seeing plenty more of these.  Not far away are the similar Hölle thundereggs, characterised by their rather more ‘bubbly’ structure.

Hölle Thunderegg from near Gehlberg

And just incidentally, Hölle means ‘Hell’ – the thunderegg from hell!

Moving into the area of the town of Friedrichsroda, we encounter more thundereggs, including the weird and frustrating location called Seebachsfelsen.  It is frustrating because it is so rare, so interesting, and such a bloody nuisance!  The agate here is often so weathered and decayed that it is almost impossible to work with – even resin doesn’t help that much because the agate is usually white and any cracks still show up like writing on paper.  The following specimen is a beauty but significantly agateless, which is probably why it worked out so well.  The crystals are just amazing – some over an inch long.

Seebachsfelsen thunderegg – at least, I think so!

This stone was actually a bit of a mystery – it was identified by someone whose opinion I trust, but sold to me as something else by someone I also trust!  On balance, from my own analysis, I am coming down on the side of Seebachsfelsen though.

Also near Friedrichsroda are the Gottlob thundereggs – still with the familiar grains in the matrix.  These are very variable but again we are seeing the familiar bands of agate surrounding quartz.

Gottlob Thunderegg.

The above is a quite classic specimen I think – deeply fractured agate forming an elegant shape and framing quartz (actually smoky quartz in this case).  It took a lot of work to polish and requited consolidation with resin three times to get a good surface.  Here is another Gottlob, this time with less agate and with an impressive growth of amethyst:

Gottlob Thunderegg with Amethyst

Gottlob translates as roughly “Praise God” – in conjunction with the Hell thundereggs, this is starting to give me an odd feeling.  See more Gottlobs here – and watch this space as I have several more lovely specimens to polish in the near future.

Köpfchen thunderegg from near Steinberg-Hallenberg

The Köpfchen displays considerably more granularity in the matrix – almost verging on the untidy – but there is still the same basic structure of banded agate surrounding quartz.  This is the best specimen in the box I managed to locate by quite a considerable margin.  Most were pretty terrible, but at the same time they are extremely rare.  You can see more on the gallery.

The next location is an old favourite of mine – Mönchstal, or Monk’s Valley.  By this time we are starting to see those matrix grains growing very large indeed and here, combined with the characteristic vivid red agate, the results are sometimes stunning.  The following is a classic specimen – a fine geode with thin red bands.

Mönchstal Thunderegg Geode

Mönchstal Thunderegg with Massive Pseudomorph

The above Mönchstal is a rather more unusual one that really caught my fancy for some reason.  The beautifully shaped core is rather more muddled than usual and has a massive square pseudomorph embedded in it (the ghost of some old crystal still showing in the structure).  See more Mönchstal thundereggs on the gallery.

Very similar and quite close by is the Hölle thundereggs . . .

Hölle Thunderegg

Now wait a moment – did I just say Hölle again?  Hölle as in ‘Hell’?  Well yes I did.  I think I may have been here before in a previous post, but yes, the Germans have not one but two thunderegg locations called ‘Hell’.  This stone maybe looks the part more than the Gehlberg ‘Hell’, with is massive grains growing in the matrix and blood-red agate.  It looks almost alien – and by this time it is beginning to dawn on us that we have arrived at some pretty weird thundereggs among these Thuringia Browns!

I will conclude though with one of the most spectacular and rarest of the new locations, which takes us back to the village of Gehlberg where we started – to a new location called Brand (which seems to mean ‘fire’).  These are like the mean older brother of the Felsenschlag – a rich brown matrix filled with some spectacular granulation.  These two stones are already among my favourite new German specimens for quite a while – and as they are also extremely rare I shall have no hesitation in squireling these two away for myself out of the small stock I acquired.

Massive Brand Thunderegg with Smoky Quartz

Rare as they are, these stones somehow seem to act as an archetype for all these Thuringia browns – the rich brown matrix, the intense inclusions in it that stand out in such a high-contrast pattern and the massive quartz growth.  They are a return to the basics and, in doing so, they find a simple drama that has an earthy and pragmatic presence.  The above stone grew into a massive geode filled with huge smoky quartz points, while the following grew a beautiful four-pointed core of clean white – again with  those thin bands of agate that are so familiar here.  Just lovely!!

Brand Thunderegg – an almost perfect X

Stein’s Pillar Thunderegg Showcase

 Hot off the polisher today – a Stein’s Pillar thunderegg and possibly the best I have seen yet.  This has always been one of my favourite locations of all, thanks to its meaty matrix and warm colours.  So let me take the opportunity to present a showcase of what is actually a quite varied location.

Red mineralisation and very sharp levelling lines.

Small and simple with banded agate, showing off the colours beautifully.

A cluster thunderegg with some dense moss filling the core.

A hollow geode specimen with only a thin band of agate.

A moss agate thunderegg that I find truly beautiful. To me, possibly among the best moss I have ever seen.

And lastly a bit of a mystery. This was sold to me as a Stein's Pillar but is a quite startlingly different stone. What do you think? A lucky strike or similar that somehow got into the wrong box? A bizarre Stein's Pillar variant? I am really not sure. All I know is that I love it, with that amazing burst of pink mineral growth.

Click here to see the full Stein’s Pillar page on the Eibonvale Gallery.

Donnybrook and it’s Younger Dutch Brother

Donnybrook is an old classic – famous and beloved for its magnificent green matrix.  I was recently able to get a bag of uncut specimens to play with, which was a fantastic experience!  Working with these is like polishing the best olives ever grown.  There are several of these on my gallery, but the following is one of the new ones – a beautiful cold green in colour.

The next stone showed a rather bizarre fuzzy nature – as though the stone developed a soft mineral growth before entombing it forever in agate.  This one also has a much yellower colour to it.

The nice thing about Donnybrooks is that even the duds can be pretty beautiful!  The following caught me by surprise.  There is not much of the thunderegg about this, though there is a tiny agate core on the left side of the rock.  This is a mix of matrix and surrounding material filled with striking parallel lines.  Red flecks of Cinnabar complete it.

And lastly, a curiosity.  Not the greatest thunderegg ever but proof that Donnybrooks are not always just green!  This is the only time I have ever encountered a RED donnybrook.

Click here for more Donnybrook stones on the main gallery.

However, just recently, a new thunderegg bed has surfaced just a short distance away from Donnybrook.  Discovered by Dutchman Ed Pieters, who named it Dutch Donny, these stones have been causing a bit of a stir lately.  Compared to Donnybrook, they are surprisingly different considering that they are just down the hill – washed through with brown and red and yellow and exquisite flow-banding, they have a sweet pretty nature that is very different to the classic powerful green of the Donnybrooks.  Warmer, gentler and more immediately approachable.

Lastly, here is a larger and more complex Dutch Donny thunderegg – a triple basically and quite feature-rich.

At any rate – the Dutch Donny stones seem set to become a classic, just like it’s near neighbour.

The Dutch Donny stones is just one of the many updates awaiting attention on the main gallery.  Have patience folks!  I will get to that soon!

T&T / TNT Thunderegg Showcase

TNT ThundereggResisting any bad puns about explosions of TNT, I was recently able to get a hefty sack-full of uncut stones from this area, which I never did know much about!

T&T or TNT thundereggs are a less well-known location from the Mill Creek Wilderness Area, alongside such stones as Fallen Tree and Stein’s Pillar.  They are usually simple stones with clear brown agate (‘root-beer agate’) and quartz.  They are also one of the locations more prone to Amethyst, as in the example above. They are a hard stone to image though – it is hard to capture the 3D depth of these stones.  Above it just looks like a purple smudge, but in reality you can see that purple ghost drifting deep inside the stone and it is absolutely beautiful!

The above is an even stronger example of the 3D depth of these stones.  Not the best cut I ever did – it was broken and I had no choice. But I like it because there is such a nice little 3D world submerged in that dark agate! I seem to have missed the important parts of the core completely and the features are visible in the depths from ‘outside’ as floating ghosts. Line it up just right and you can see a perfect little funnel of levelling lines floating in there.

T&T Thunderegg

The above is an absolute classic stone in my experience, showing off all the basic characteristics nicely.  It is the elegant shapes that make these stones so appealing, as in the following, where an atoll formation has created a very nice peripheral cave.

T&T Thunderegg

The other half:

T&T Thunderegg

The agate is so clear and smooth that they were a nightmare to scan, with every speck of dust on the scanner showing up like a firework show.  They took a great polish though.  One or two of the stones surprised me by having white opal cores – and also more complex things like the following, which is a curious muddle of agate, brecciation and what look like tiny dendrites.

T&T Thunderegg

The clear agate often allows you to see deeply into the stones, making out the 3d structure inside.  The stone below is a fine example, with a largish cave and very detailed view of the core.

T&T Thunderegg

And the other half:

T&T Thunderegg

To round off though, here is a larger example that proves that the location can be quite dramatically complex.  This one has been in my gallery for a long time now, but exploring a sackful of its kin only makes me appreciate it more.

T&T Thunderegg