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Over time copper will naturally change colors, transforming from a shinybright red-orange color to d..
Lab-grown specimens like this one are typically damage-free and feature sharp, lustrous crystals tha..
This specimen features cubic fluorite crystals in a clear lilac color with the very distinctive viol..
This brightly polished gem calcite rhombohedron is water-clear, making it easy to see it perform the..
Trigonic quartz crystals are very rare. They are characterized by triangles which are indented..
This is a superb specimen with bright yellow cubic fluorite crystals to .5" on matrix. The crystals ..
This calcite specimen features crystals with sparkling vitreous luster and excellent clarity, and is..
Andalusite, which typically grows in metamorphic environments, rarely forms crystals, so the ones fr..
In my opinion, the powder blue plumbogummite pseudomorphs of pyromorphite from the November, 2014 po..
The inside of this skeletal quartz crystal is highly skeletalized, and some of the inner surfaces ar..
Melanite, which is a variety of andradite garnet, forms sharply crystallized groups of dodecahedral ..
Here is an outstanding stibnite specimen with crystals radiating upward & outward in a highly sc..
This specimen of melanite, a variety of andradite garnet, is a sharply crystallized group of crystal..
Specimens of this material, which goes by the name grape agate, first appeared on the market in 2016..
This is a great cubic fluorite specimen from a classic locality: the world-famous Annabel Lee Mine. ..
Here is a fine example of this unusual and fascinating Florida phenomenon: an intriguing specimen fo..
Water clear Iceland spar like this one is only found in a few localities in the world, and this piec..
From a new find in 2017 comes this superb fluorite specimen with cubic fluorite crystals in a ..
Here is a beautiful calcite specimen from the historic Ojuela Mine in Mexico, featuring hundreds of ..
This single fluor-uvite crystal has a highly complex habit with sharp, glassy faces and a complex te..
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