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Formula: Na2(Fe3+,Mn2+)3Si8O20(OH)2.4H2O
Phyllosilicate (sheet silicate), palygorskite group
Crystal System: Monoclinic
Specific gravity: 2.465 measured, 2.12 calculated
Streak: Brownish yellow
Colour: Golden-yellow, reddish brown, brown, dark brown, orange-yellow, green
Luminescence: Not fluorescent under UV
Environments
Volcanic igneous environments
Pegmatites
Localities
At the type locality, Tuperssuatsiat Bay, Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland,
Tuperssuatsiaite occurs as a late-stage, low-temperature, hydrothermal mineral in veins cutting
nepheline syenite and in
sodalite - nepheline syenite
pegmatite. It forms mm- to cm- sized red-brown fan shaped
aggregates or rosettes of fine fibres. Associated minerals include natrolite,
albite, orthoclase,
aegirine, sodalite and
steenstrupine
(HOM, Mindat).
Tuperssuatsiaite from Tuperssuatsiat Bay -
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At the Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia, Tuperssuatsiaite occurs in miarolitic
cavities in phonolite associated with
microcline, aegirine,
natrolite, eudialyte,
bastnäsite, makatite,
villiaumite, titanite,
apophyllite, analcime and
aragonite
(HOM).
Tuperssuatsiaite from the Aris Quarries -
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