Description Collinsite



brown-colored collinsite françois lake


collinsite translucent , brown, chocolate-black, light brown, yellowish white, white, or colorless. colorless in thin section , light yellow-brown colorless in transmitted light. zincian variety of collinsite pale blue. mineral can occur fibrous habit, globular aggregates of crystals, concentrically layered botryoidal masses, or bladed or prismatic crystals 2 cm (0.79 in).


collinsite member of fairfieldite group. hillite zinc analogue of collinsite , collinsite magnesium analogue of messelite.


varieties

there 3 varieties of collinsite:



magnesian collinsite, ca2mg(po4)2·2h2o
zincian collinsite, ca2(mg,zn)(po4)2·2h2o
strontian collinsite, (ca,sr)2(mg,fe)(po4)2·2h2o

magnesian collinsite described south dakota in 1972, zincian collinsite described south australia in 1973, , strontian collinsite described russia 1965. replacement of calcium strontium occurs in strontian collinsite atypical of collinsite.








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