Formula : CaMg[F/AsO4]
System: monoclinic Hardness:5 Rarity:rare
Strunz id:VII/B.25-30 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: Named in 1895 by Stens Anders Hjalmar Sjögren in honor of Daniel Tilas [March 2, 1712 Gammelbo, Ramsbergs parish, Västmanland, Sweden - October 27, 1772 Stockholm, Sweden], polymath, geologist, mining engineer, vicar of Hammar, director of mines, and regional governor.
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