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Formula: Ca3Mn4+(SO4)(CO3)(OH)6.12H2O
Hydrated sulphate, ettringite group
Crystal System: Hexagonal
Specific gravity: 1.95 measured
Hardness: 2½
Colour: Bright yellow, greenish yellow to greenish orange, pink
Environments
Volcanic igneous environments
Fumeroles
Jouravskite occurs rarely in the oxidised portions of manganese
deposits; an aluminium-rich variety is formed by the action of volcanic
fumaroles
(HOM).
Localities
At the type locality, the Tachgagalt Mine, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region,
Morocco, jouravskite occurs as greenish-yellow to greenish-orange spots 1 to 5 mm across in a dark mass of
manganese minerals. The individual grains are several tenths of a
millimeter in diameter and rarely show crystal faces
(Mindat).
Associated minerals include manganite,
calcite, marokite,
gaudefroyite,
henritermierite,
despujolsite and baryte
(HOM).
Jouravskite from the Tachgagalt Mine -
Image
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