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Formula: SrFe3+3(PO4)(SO4)(OH)6
Phosphate, alunite supergroup,
strontium-bearing mineral
Crystal system: Trigonal
Slottaite is a new mineral, approved in 2024 and to date (May 2025) reported only from the type locality.
Pending publication.
Localities
The type locality is the Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany. More
than 472 unique mineral species have been recorded from the Clara Mine, placing this mine among the most prolific
mineral localities on Earth. There is species-defining strontium in 4 of
the 17 minerals first discovered at the Clara Mine. Of these,
arsenogoyazite is the most widely distributed with 25
reported localities, while benauite and
oberwolfachite are each reported from just three localities, and
slottaite remains a one locality mineral at the time of writing (May 2025). Indications are that
strontium is present at the Clara Mine in unusual geochemical environments
scarcely replicated elsewhere
(AM 110.826).
Slottaite has been found as a greenish- to brownish- yellow radiating aggregate in association with
colourless quartz and dark brown
goethite
(Mindat photo).
Slottaite from the Clara Mine - Image
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