Jahnsite-(MnMnZn)

jahnsite-(MnMnZn)

libethenite

rhodochrosite

santabarbaraite

Images

Formula: Mn²⁺Mn²⁺Zn₂Fe³⁺₂(PO₄)₄(OH)₂.8H₂O
Phosphate, jahnsite subgroup, jahnsite group, manganese-bearing mineral
Crystal System: Monoclinic
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 (May 2023) 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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