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In Michigan's copper mines, copper is often found loose in the veins, when the calcite has naturally..
Here is a bright-white specimen of the rare borate mineral meyerhofferite that has replaced sharp pr..
Here is a large fluorite octahedron from the Denton Mine. The fluorite has been cleaved along its na..
This is a section of a celestite geode which is covered with flashy sky-blue crystals. The cry..
On this specimen prehnite is formed as spheres which are speared through and underlain by lustrous d..
The Milpillas Mine has mined out the last of the oxidized zone that produced the famous world-class ..
Here is a copper nugget from Michigan in a bright-as-a-new-penny metallic red-orange copper color. T..
Lapis lazuli (the name for gem lazurite) from Sar-e-Song has set the standard for this attractive se..
This crystal-filled celestite geode is a fine example of this very popular mineral, featuring sharp,..
Here is a lovely specimen of prehnite on epidote, featuring a couple of bubbly botryoidal prehnite b..
In the copper mines of the Upper Peninsula of Michigan, pure copper is sometimes found in nuggets, l..
Here is a superb specimen - an exceptional crystal of azurite from the highly regarded Milpill..
What a combination - a fossil clamshell that is lined with gem clear, golden calcite crystals!..
Here is an attractive gem-grade specimen of polished lapis lazuli from the historic Sar-e-Sang mines..
This bright, highly polished gem calcite rhombohedron is water-clear, making it easy to see it perfo..
White cap and white stripe amazonites are rare and highly valued by collectors worldwide. This..
Here is a flashy grossular garnet specimen with sharp, mirror-bright crystals lining a vug in a mass..
This elongated cathedral quartz crystal has great buttress-like shoulders and well developed turrets..
This exceptional matrix specimen of topaz features several large, terminated crystals to 1" set on a..
This Spanish fluorite specimen features transparent cubic crystals to .3" of a rich yellow honey col..
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