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Stevensite

Type Locality
Bergen Hill, Bergen Co. & Hudson Co., New Jersey, USA
Mineral Data
(Ca,Na)xMg3-x(Si4O10)(OH)2
Isostructural with: 
Smectite Group
Strunz: 
8/H.20-40
Physical Properties
Colour: 
White, Pale Yellow, Pale Brown, Pale Pink
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
Tenacity: 
Fragile
Synonyms
Synonyms: 
Afrodite and Aphrodite