Cafarsite

Infobox mineral
name = Cafarsite
category = Arsenites
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formula = Ca₈ (Ti,Fe,Fe,Mn)_6-7(AsO₃)₁₂ 4H₂O
molweight = 2,230.31 gm
color = Dark brown
habit =
system =
twinning =
cleavage =
fracture = Conchoidal
tenacity =
mohs = 5½ - 6
luster = sub-metallic
polish =
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absorption =
streak = Yellow-brown
gravity =
density = 3.9 g/cm3
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Translucent to Opaque
other =
references = [ [http://www.webmineral.com/data/Cafarsite.shtml Cafarsite Mineral Data ] ] [ [http://www.mindat.org/min-849.html Cafarsite: Cafarsite mineral information and data] ]

Cafarsite (Ca₈ (Ti,Fe,Fe,Mn)_6-7(AsO₃)₁₂ 4H₂O) is a mineral discovered in Switzerland in 1966.

References