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Mesolite is a zeolite that forms tufts of long, ...

Needle stone or needle-zeolite are other informal names for ...

Obsidian is a silica rich volcanic glass. Chemical ...

Olivenite forms as a layer on top of copper ...

Kyanite is a deep blue, elongated crystal. Chemical ...

When Olivine is in large, gem-quality pieces, it is ...

Opal is hardened balls of silica gel that form ...

Orpiment is one of the more common arsenic ores. ...

Pectolite is a very complex mineral group with a ...

Purpurite is easy to identify with its striking pink ...