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Quartz: Mineral information, data and localities.
Is this green obsidian? Slag? Something else? : r/rockhounds
Everything You Need to Identify Rocks
Why are hardness and density important mineral classifications? - Quora
Learn about fine minerals & gems at the Wisdom Pocket Blog
At the Mineralogical Museum - The Reformed Journal Blog
Fluorescent Minerals, I have some Sodalita several locations in my collection but perhaps this is one of the most beautiful for his tenebrescent so dramatic after exposure
Rock Types
Found this Beauty in Southern Oregon today. Any ideas what it is? I'm thinking green jasper, but how about the white parts? : r/rockhounds