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Amstallite
Type Locality
Amstall Graphite Quarry, Lower Austria, Austria
Mineral Data
CaAl(Si,Al)
4
O
8
(OH)
4
·(H
2
O,Cl)
Strunz:
9.DP.25
Physical Properties
Hardness:
3.0 - 5.0
Tenacity:
brittle
