Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: David Hospital · CC BY-SA 4.0
Pb₅(SiO₄)₁.₅(SO₄)₁.₅(Cl,OH)
Apatite, nesosilicate mineral
Named after Matthew Forster Heddle
Source: Wikidata
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