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A calcium aluminum silicate mineral
It is mined exclusively in Chihuahua Mexico in a limestone matrix
The black color is often due to the presence of iron impurities within the crystal structure
Tiger's Eye
Russian Ammonite Quenstedticeras C black tourmaline A calcium aluminum silicate mineralThese Quenstedticeras Ammonite come all the way from Russia. Quenstedticeras is a genus Upper Callovian (Middle Jurassic) ammonites known for their high quality, often pyritized and iridescent, fossils found primarily in Russia. These cephalopods, which lived in marine environments, are characterized by moderately evolute shells with strong, bifurcating ribs, forming a starburst pattern. Measuring 1. 3 inches in length, 1. 4 inches in height, and . 4
