What this green mineral could be? it's harder than glass : r/rockhounds

Danburite Moldavite Stone Siberian Blue Quartz Crystal Necklace Magician Stone Pendant A - Canada

Why are hardness and density important mineral classifications? - Quora

Quartz Crystal Point, Ancient Sand Inclusion Crystal Raw Rough Unpolished Natural Healing Stone Reiki Chakra Energy - Canada

How can you tell if gemstone beads are genuine or imitation? - Rings and ThingsRings and Things

A close look at antimony, stibnite, and stibiconite with comments on contemporary mineral collecting. — Exotica Esoterica

Learn about fine minerals & gems at the Wisdom Pocket Blog

Is this green obsidian? Slag? Something else? : r/rockhounds

What is the green in this rock? : r/rockhounds

Metamorphic Rocks: Pictures, Descriptions & Identification – Rockhound Resource

At the Mineralogical Museum - The Reformed Journal Blog

What this green mineral could be? it's harder than glass : r/rockhounds

Quartz: Mineral information, data and localities.

Michigan Stones Archives - The Snob Blog

Great Lakes Rocks & Minerals, Wondering if I could get and ID on these two