Oberwolfachite

oberwolfachite

beudantite

dussertite

graulichite-(Ce)

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Formula: SrFe³⁺₃(AsO₄)(SO₄)(OH)₆
Compound arsenate, beudantite group, strontium-bearing mineral
Crystal System: Trigonal
Specific gravity: 3.874 calculated
Streak: Yellow
Colour: Yellow to brown
Environments

Hydrothermal environments

Oberwolfachite is a new mineral, approved in 2021.

Localities

There are two co-type lovalities, the Clara mine, Oberwolfach, Wolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, and the Monterniers Mines, Lantignié, Villefranche-sur-Saône, Rhône, Auvergne-Rhône-Alpes, France.

At the Monterniers Mines, Lantignié, Villefranche-sur-Saône, Rhône, Auvergne-Rhône-Alpes, France, oberwolfachite forms yellow to brown platy crystals up to 1 mm across or thick outer zones of mixed oberwolfachite–beudantite crystals up to 3 mm across. Associated minerals include arsenogoyazite, jarosite, graulichite-(Ce), goethite and hematite (MM 85.5.808-816)

At the Clara mine, Oberwolfach, Wolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, oberwolfachite forms yellow to brown platy crystals up to 1 mm across or thick outer zones of mixed oberwolfachite–beudantite crystals up to 3 mm across. Associated minerals include quartz, baryte, hematite, illite, goethite, beudantite and dussertite (MM 85.5.808-816)

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