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With a Mohs hardness between 6 and 7
including a central columella and fine radiating septae
7 Inches Thick (Matriz)
Most Paleozoic crinoids attached themselves to ocean floor substrates
4.7" Rough Purple Amethyst Crystal Cluster Mineral Specimen Brazil Self Standing Glyptodon With a Mohs hardness betweenLocation: Brazil Weight: 2 Pounds 5. 4 Ounces Dimensions: 4. 7 Inches Long, 4. 5 Inches Wide, 3. 1 Inches Thick The item pictured is the one you will receive. Amethyst Amethyst is a naturally occurring purple variety of quartz celebrated for its striking color, crystal formations, and long standing popularity as a gemstone. Composed of silicon dioxide (SiO), amethyst forms under specific geological conditions that allow iron impurities and natural
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