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Formula: Na21(SO4)7ClF6
Anhydrous sulphate containing halogen
Crystal System: Trigonal
Specific gravity: 2.612 measured, 2.619 calculated
Hardness: 3½
Streak: White
Colour: Colourless
Solubility: Slowly soluble in water
Environments:
Schairerite occurs in continental evaporite deposits
(Webmin).
Localities
At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, the schairerite occurrence is associated
with an intrusive alkalic gabbro-syenite complex.
Associated minerals include pectolite,
shortite, kogarkoite,
phlogopite, arfvedsonite,
leucophanite and leucosphenite
(HOM).
The type locality, Searles Lake, San Bernardino county, California, USA, is a playa lake deposit. Schairerite was found in a drill core in
a lower salt bed. Associated minerals include gaylussite,
tychite, galeite,
thénardite, northupite,
trona, hanksite,
calcite, pirssonite and
hanksite
(Dana, HOM). Inclusions within the schairerite crystals consist of tychite,
pirssonite (?), and thénardite (?)
(AM 16.133-139).
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