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

Jade - Wikipedia

Agate/Thing I found in Washington. Any idea what the green is? : r/ rockhounds

Metamorphic Rocks: Pictures, Descriptions & Identification – Rockhound Resource

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

Quartz: Mineral information, data and localities.

15dfvdfv by dfdfvdfv345345ffgb - Issuu

_OceanofPDF.com_Rocks_Gems_and_Minerals_of_the_Rocky_Mou_-_Garret_Romaine, PDF, Granite

Quartz: Mineral information, data and localities.

Polished Stone Identification - Pictures of Tumbled Rocks

Found this about 20 years ago - Odd green crystal and stone is incredibly hard. : r/whatsthisrock

Geology: What are the most interesting looking rocks and minerals? - Quora

Journal of weekly news and commentaries about rocks and minerals and mineral collecting - John Betts' Mineral Blog