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Cold Mountain Thundereggs are highly silicate and filled with brecciation
This specimen features purple chalcedony in orb formations
Agates of Lake Superior: Stunning Varieties and How They Are Formed
25" x 2" x 1
BLT171 Black Tourmaline Bruneau Jasper Cold Mountain Thundereggs are highlyBlack Tourmaline crystal with natural termination. 2" x 1. 75" x 5. 25" 1. 35 lb Black Tourmaline is also called Schorl, and accounts for ninety five percent of all Tourmaline in nature. It is black, or sometimes a deep blue that appears black. The term Schorl was in use before the 1400s, named for a town in Saxony, Germany, where Black Tourmaline was found in nearby tin mines. Black Tourmaline belongs to a complex family of aluminum borosilicate
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