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Formula: NaBSi3O8
Tectosilicate (framework silicate), feldspar group
Crystal System: Triclinic
Specific gravity: 2.70 to 2.78 measured, 2.779 calculated
Hardness: 6 to 6½
Streak: White
Colour: Colourless to yellow-orange, salmon-orange
Solubility:
Common impurities: Ti,Al,Fe,Mg,Ca,Ba,K,F,H2O,P
Environments
Pegmatites
Sedimentary environments
Localities
At the Dara-i-Pioz Glacier, Districts of Republican Subordination, Tajikistan, reedmergnerite is found in a pegmatite in an alkalic
massif associated with leucosphenite, eudialyte,
stillwellite-(Ce), pyrochlore,
microcline, aegirine,
polylithionite, albite and
quartz
(HOM).
At the type locality, the Joseph Smith No. 1 well, Duchesne county, Utah, USA, reedmergnerite occurs as authigenic (formed in situ)
crystals along bedding laminations, in brown dolostone and black oil
shale from well cuttings and cores. Associated minerals include
eitelite, shortite,
nahcolite, searlesite,
leucosphenite,
aegirine, analcime and
magnesio-riebeckite
(AM 45.188-199, HOM).
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