Qatranaite
Qatranaite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaZn₂(OH)₆(H₂O)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 3.5; specific gravity 2.598; White streak; Vitreous luster; optically biaxial.
IMA symbol Qat, IMA status: approved, named in 2016.
Found in altered pyrometamorphic spurrite marbles in secondary low-temperature (<70 flC) veins exclusively in cuspidine zones with large spurrite crystal relics.
It is found associated with Se-bearing thaumasite, calcite, afwillite, barite, sometimes replaces sphalerite.
The name refers to Al Qatrana village, on the Amman-Aqaba highway, 15 km southeast of the type locality.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more Q minerals or help write this entry.