Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: Wikimedia Commons
Na₁₂(K,Sr,Ce)₃Ca₆Mn₃Zr₃Nb(Si₂₅O₇₃)(O,H₂O,OH)₅
Cyclosilicate mineral
Named after Valeriy I. Andrianov
Source: Wikidata
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