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This is a specimen of solid purpurite, a manganese phosphate mineral, from Namibia. It is colo..
This is a superb specimen of dravite tourmaline, the manganese-rich member of the tourmaline group (..
Here is a fine specimen of sillimanite from New Hampshire, where a friend of mine collects these cry..
This siderite specimen is an old-time and superb piece from the historic Connor Pond locality in Oss..
Here is a sharp, glassy, gemmy, nearly clear orthorhombic prismatic crystal of natrolite from the Ch..
Here is a crystal specimen of the very rare lithium pegmatite mineral, petalite. It is a fine crysta..
The shiny metallic silver huebnerite crystal on this specimen is a very dark cherry red color, not t..
This crystal flashes brilliantly in iridescent shades of blue, violet, green, and gold, due to a thi..
Diopside from the Orford Nickel Mine has a bladed crystal habit and is pale green in color, nd looks..
Here is a specimen featuring sharp datolite crystals from the Lane Quarry. The gemmy datolite crysta..
The dark blue azurite crystals on this fine specimen sparkle brightly and have a brillinat, wet-look..
This formation was created by pouring molten copper at 2200 degrees Fahrenheit into a bale of hay wh..
Antigorite is a hard, compact type of serpentine, which occurs as elongated fibrous crystals at the ..
Coprolites are trace fossils, and are fossilized dung. This coprolite probably came from a duck-bill..
This lovely specimen of linarite features brilliant, electric blue microcrystals lining vugs on a la..
This is a phenakite crystal from the Russian Urals. It is not sharply formed, but it weighs 43..
This eye-catching cluster of bright blue aqua aura quartz features sharp crystals to 2.1" with iride..
The azurite crystals on this specimen are up to .9", and are sharp and shiny, with smooth planer fac..
This phenakite crystal from the Russian Urals comes from the type locality for phenakite. It has a f..
On this specimen of Brazilian kyanite there are long blue bladed crystals combined with nearly clear..
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