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Harmotome

Type Locality
St Andreasberg, St Andreasberg District, Harz, Lower Saxony, Germany
Mineral Data
(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] ·12H2O
Strunz: 
9.GC.10
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
4.0 - 5.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Andreolite, Andréolithe, Barytes Harmotome and Harmotom
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