Qatranaite

qatranaite

cuspidine

afwillite

srebrodolskite

Images

Formula: CaZn2(OH)6(H2O)2
Hydroxide
Specific gravity: 2.598 calculated
Hardness: 3½
Streak: White
Colour: Colourless, white
Environments

Metamorphic 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, srebrodolskitebrownmillerite, spinelmagnesioferrite, spurrite and fluorapatitefluorellestadite.
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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