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collinsite
Collinsite is a mineral with formula Ca2(Mg,Fe2+)(PO4)2·2H2O. It was discovered in British Columbia, Canada, and formally described in 1927. It was named in honor of William Henry Collins (1878–1937), director of the Geological Survey of Canada. There are three varieties of the mineral: magnesian collinsite, zincian collinsite, and strontian collinsite. The crystal structure consists of polyhedral chains linked by weak hydrogen bonds.
==Description==
Collinsite is translucent and brown, chocolate-black, light brown, yellowish white, white, or colorless. It is colorless in thin section〔 and light yellow-brown to colorless in transmitted light.〔 The zincian variety of collinsite is pale blue.〔 The mineral can occur with fibrous habit, as globular aggregates of crystals, as concentrically layered botryoidal masses, or as bladed or prismatic crystals up to .〔
Collinsite is a member of the fairfieldite group.〔 Hillite is the zinc analogue of collinsite and collinsite is the magnesium analogue of messelite
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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