White acicular crystals of the extremely rare mineral proto-anthophyllite from the type locality: Takase Mine, Shingo-takase, Niimi City, Okayama, Honshu Island, Japan. Proto-anthophyllite was found in A SINGLE DRILL CORE at the type locality. This is a part of the drill core as it can be seen perfectly in the photos. Alfredo Petrov specimen. — Photo: David Hospital · CC BY-SA 4.0
Proto-anthophyllite
Proto-anthophyllite is an IMA-recognized mineral species in the silicate class, with the chemical formula Mg₂Mg₅Si₈O₂₂(OH)₂.
It crystallizes in the orthorhombic crystal system (space group Pnmn). It is a member of the Amphibole structural group.
IMA symbol Path, IMA status: approved, named in 2001.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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