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Formula: Mn2+Al2(PO4)2(OH)2.8H2O
Hydrated phosphate, laueite group,
paramorph of
mangangordonite,
manganese-bearing mineral
Crystal System: Triclinic
Specific gravity: 2.35 measured, 2.379 calculated
Hardness: 1 to 2
Streak: White
Colour: Generally colourless, may be white
Luminescence: Not fluorescent under UV
Environments
Kastningite is a rare secondary mineral in
granite
pegmatites associated with
variscite, paravauxite,
albite, mica and
quartz
(HOM).
Localities
At the type locality, Silbergrube, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany,
kastningite occurs as sprays of thin, tabular crystals, up to 2 mm long. It is an alteration product of
primary phosphates, and is associated with
variscite and paravauxite; it
occurs in a granite
pegmatite that is mined for
feldspar
(AM 84.1465-1466).
Kastningite from Silbergrube - Image
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, kastningite is rare and
occurs typically in voids in rhodochrosite masses that are in close
proximity to montebrasite. The Emmons pegmatite is an example of a
highly evolved boron-lithium-cesium-tantalum enriched
pegmatite
(R&M 94.6.509).
Kastningite from the Emmons Quarry -
Image
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