Specific gravity: 3.89
Hardness: 3½ to 4
Jørgensenite is a very rare aluminofluoride reported from only one locality to date (March 2021).
The type locality is the Ivigtut cryolite deposit, Ivittuut, Arsuk Fjord, Sermersooq, Greenland, Denmark. Here jørgensenite occurs in fissure fillings within the main cryolite mass, and in crystal-lined cavities containing aggregates up to 2 mm across of jørgensenite overgrown by jarlite. It also occurs as grains up to l0 mm across with stenonite (CM 35.175-179).
Other associated minerals include thomsenolite, gearksutite, topaz and muscovite (HOM).
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