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Ruby Gemstone: Field Guide
Ruby gemstones (a variety of corundum (Al2 O3)), owe their striking red coloration to trace amounts of chromium within their crystal structure. While red is...
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Yooperlites: What & Where to Find Them
Yooperlites: these fluorescent sodalite rocks are found along the shores of the Great Lakes and are especially popular in the Upper Peninsula of Michigan...
What are Herkimer Diamonds?
What are Herkimer diamonds? Nestled in the central New York Leatherstocking region made famous by 19th-century American writer James Fenimore Cooper in The Last...