HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Riebeckite
Riebeckite (a basic silicate of sodium and iron) is a fairly common mineral that is dark blue or black. Its cross-section is shaped like a diamond. This mineral is found in sodium-rich igneous rock and in metamorphic rock. Crocidolite, a variety of riebeckite, is used for electrical insulation and fireproofing. Riebeckite occurs in places such as Massachusettes, USA, and Brazil. [LM] {CC} {SS}
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