Phosphate, jahnsite group
Specific gravity: 2.89 measured
Colour: Light golden brown
Jahnsite-(MnMnZn) is a relatively new mineral, approved in 2018 and to date (July 2022) reported only from the
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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