Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: David Hospital · CC BY 4.0
Ba₂(Mn,Fe,Ti)Si₂O₆(O,OH,Cl,F)₂ * 3H₂O or near
Cyclosilicate mineral
Named after William E. ver Planck
Source: Wikidata
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