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Formula: Zn4(SO4)(OH)6.3H2O
Hydrated zinc sulphate, namuwite group
Crystal System: Triclinic
Specific gravity: 2.98 measured, 2.995 calculated
Hardness: 1½
Colour: Colourless
Environments
Localities
At the type locality, the Friedrichssegen Mine, Friedrichssegen, Lahnstein, Rhein-Lahn-Kreis, Rhineland-Palatinate,
Germany, lahnsteinite was discovered at the mine dump. It formed in the oxidation zone of a complex
lead - zinc -
copper - silver -
iron deposit, where the ore is related to
quartz-siderite veins that crosscut
Devonian (419.62 to 358.86 million years ago) schist. The
lahnsteinite occurs in cavities in goethite, and is associated with
hydrozincite, pyromorphite
and native copper. Perroudite,
native silver, iodine- and chlorine- bearing
mercury and silver sulphides were
found in similar cavities in goethite.
Lahnsteinite forms hexagonal tabular crystals up to 0.15 × 0.5 × 0.5 mm3 in size
(AM 99.1.242-247).
Lahnsteinite from the Friedrichssegen Mine -
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