Anhydrous normal phosphate
Specific gravity: 2.64 to 2.66
Colour: Colourless, greyish or pale pink; colourless in transmitted light.
Solubility: Readily soluble in alkalies; virtually insoluble in cold acids.
Berlinite is a rare high-temperature hydrothermal or metasomatic mineral. Often found in caves after
guano fires (Webmin, HOM).
It is isostructural with quartz, which is a tectosilicate (framework silicate). Berlinite inverts at 583° to a polymorph isotypic with β-SiO2 (Mindat)
In granite pegmatites associated minerals include augelite, attakolite, kyanite, pyrophyllite, scorzalite, lazulite, gatumbaite, burangaite, amblygonite, phosphosiderite, purpurite, apatite, muscovite, quartz and hematite (HOM).
At Paddy's River mine, Australia, berlinite is associated with alunite, aragonite, collophane (variety of apatite), crandallite, francoanellite, gypsum, huntite, hydromagnesite, leucophosphite, nesquehonite, niter and nitrocalcite (HOM).
At the type locality, the Västanå Iron Mine, Näsum, Bromölla, Skåne County, Sweden, berlinite is associated with augelite and attakolite (Mindat).
Common impurities: Fe,Si
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