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This is a specimen of biotite mica that is the iron-rich, dark brownish black cousin of muscovite mi..
This is a specimen of indicolite tourmaline crystals, in a dark blue color, embedded in a muscovite ..
This dramatic specimen of selenite has radiating needle-like crystals perched on top of several earl..
Sillimanite is an unusual alumino-silicate mineral that is uncommon on the mineral market. This spec..
Here is an attractive specimen featuring a fat radiating spray of dark green epidote crystals, which..
This drippy piece of copper is highly aesthetic and visually amazing. The color is a brilliant orang..
Here is a specimen of barite crystals from the highly regarded Stoneham, Colorado locality. The piec..
This group of sharply crystallized smoky quartz crystals features gemmy translucent smoky quartz cry..
Here is a well crystallized cluster of radiating pyrophyllite crystals from North Carolina. The shar..
Here is a wonderful specimen of selenite which is completely made up of sword bladed crystals of sel..
This is a fine specimen of coprolite from Madagascar. It has great detail and recognizable, slightly..
Here is a gemmy, fine quality specimen of Rogerly fluorite crystals from the 2015 mining season.&nbs..
Here is a 34 gram polished slice of chrysoprase gem rough from the Old Yerilla Mine in Western Austr..
I love the brilliant stars of rutile and hematite in specimens like this one. On this piece the gold..
This specimen is a very flashy, polished nugget of mohawkite, a rare mineral composed of copper, alg..
Here is a pyrophyllite specimen that is made up of groups of radiating crystals which have grown out..
This is a vibrantly colorful dioptase specimen from Kazakhstan that is a rich emerald green. There a..
Here is a section of gemmy crystaline petalite, a rare lithium-rich pegmatite mineral. The petalite ..
This coprolite probably came from a duck-billed dinosaur, a herbivore that lived in Madagascar about..
Here is a sheet of selenite that is a big crystal plate of the material found at the White Ice Mine ..
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