Kemmlitzite

kemmlitzite

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Formula: SrAl₃(AsO₄)(SO₄)(OH)₆
Valence: SrAl₃(As⁵⁺O₄)(S⁶⁺O₄)(OH)₆
Arsenate, beudantite group, alunite supergroup, strontium-bearing mineral
Crystal system: Trigonal
Specific gravity: 3.63 measured, 3.601 calculated
Hardness: 5½
Colour: Light greyish brown, colourless, brownish (zonal)
Solubility: Resistant to mineral acids
Magnetism: Low magnetic susceptibility
Environments

Sedimentary environments

Localities

At the type locality, Kemmlitz, Mügeln, Nordsachsen, Saxony, Germany, kemmlitzite occurs in pseudo-cubic rhombohedral crystals with average rhombohedron edge 0.1 to 0.15 mm. The basal pinacoid is rarely present. Colour light greyish brown, partly colourless, and partly cloudy brownish with zonal structure. The mineral was found in the heavy fraction separated from kaolinised quartz porphyry. Amongst the associated heavy minerals, zircon, anatase and apatite are most abundant (AM 55.317-323).
Kemmlitzite from Kemmlitz - Image

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