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Perhamite

Type Locality
Dunton Gem Quarry, Newry, Oxford Co., Maine, USA
Mineral Data
Ca3Al7.7Si3P4O23.5(OH)14.1·8H2O
Strunz: 
8.DO.20
Physical Properties
Streak: 
white
Hardness: 
5.0
Tenacity: 
very brittle