Jahnsite-(MnMnZn)

jahnsite-(MnMnZn)

libethenite

rhodochrosite

santabarbaraite

Images

Formula: Mn2+Mn2+Xn2Fe3+2(PO4)4(OH)2.8H2O
Phosphate, jahnsite group
Specific gravity: 2.89 measured
Hardness: 4
Streak: White
Colour: Light golden brown
Environments

Hydrothermal environments

Jahnsite-(MnMnZn) is a relatively new mineral, approved in 2018 and to date (July 2022) reported only from the type locality.

Localities

At the type locality, the Herdade dos Pendões Mine, São Luís, Odemira, Beja, Portugal, jahnsite-(MnMnZn) formed in a highly altered gossan in association with zinc-bearing libethenite, quartz, rhodochrosite and santabarbaraite. It occurs in sub-parallel bundles of light golden brown prisms up to 0.3 mm long (EJM 31.1.167-172).

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