Tectosilicate (framework silicate), feldspar group
Hardness: 6 to 6½
Colour: Colourless to yellow-orange, salmon-orange
Common impurities: Ti,Al,Fe,Mg,Ca,Ba,K,F,H2O,P
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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