Sadanagaite

sadanagaite

amphibole

Kasuga mine

dolomite

Images

Formula: NaCa₂(Mg₃Al₂)(Si₅Al₃)O₂₂(OH)₂
Inosilicate (chain silicate), double chains, sadanagaite root name group, calcium amphibole subgroup, w(OH,F,Cl)-dominant amphibole group, amphibole supergroup
Crystal system: Monoclinic
Specific gravity: 3.30 calculated
Hardness: 6
Streak: Pale brown
Colour: Black, dark brown
Common impurities: Mn
Environments

Metamorphic environments

The type locality is Kasuga mine, Ibigawa-cho, Ibi District, Gifu Prefecture, Japan, which is hosted by contact metamorphosed dolomite skarn, mined for dolomite (Mindat).
Sadanagaite from Kasuga Mine - Image

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