A very big number of very small pieces of the very rare mineral Sr-Al arsenate mineral kemmlitzite from the TL in Kemmlitz, Germany. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Kemmlitzite
Kemmlitzite is an IMA-recognized mineral species in the arsenate class, with the chemical formula SrAl₃(AsO₄)(SO₄)(OH)₆.
It crystallizes in the hexagonal crystal system. It is a member of the Alunite-beudantite structural group.
Key properties: Mohs hardness 5.5; specific gravity 3.63; optically uniaxial.
IMA symbol Kml, IMA status: approved, named in 1967.
Found in a kaolinized quartz porphyry, in a heavy-fraction separate of undetermined origin as to primary or secondary formation.
It is found associated with Kaolinite, zircon, anatase, apatite, 13 other less-abundant heavy minerals.
The name is derived from the locality of the first specimens, Kemmlitz, Germany.