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Tilasite - Mt. Cervandone area, Devero Alp, Baceno, Devero Valley, Antigorio Valley, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
(#:MINS7772)
Clean group of dark-pink Tilasite xls, perched on the gneiss matrix in association with minor Chlorite. Classic alpine specimen.
Formula :
CaMg[F/AsO
4
]
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.
Specimen weight:58 gr.
Crystal size:Up to 3.0 mm long
Overall size: 57mm x 37 mm x 25 mm
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