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Formula: CaZn2(OH)6(H2O)2
Hydroxide
Specific gravity: 2.598 calculated
Hardness: 3½
Streak: White
Colour: Colourless, white
Environments
Qatranaite was approved in 2016, but to date (June 2022) it has been reported only from the type locality.
Localities
At the type locality, the Qatranaite locality, Siwaga, Lisdan-Siwaga Fault, Hashem region, Daba-Siwaqa complex,
Transjordan Plateau, Amman Governorate, Jordan, qatranaite was found in
cuspidine veins cutting spurrite
marble in part of the pyrometamorphic complex. It forms colourless or
white crystals up to 0.3 mm in size. Qatranaite is associated with
cuspidine, sphalerite,
selenium-bearing thaumasite,
afwillite, calcite,
srebrodolskite–brownmillerite,
spinel–magnesioferrite,
spurrite and
fluorapatite–fluorellestadite.
Qatranaite crystallisation was preceded by a high-temperature alteration of
spurrite rocks, reflected in the formation of
cuspidine along fractures. The formation of qatranaite-bearing
veins resulted from low-temperature (<70oC) rock alteration by hyper-alkaline solutions
(EJM 31.3.575–584).
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