Welinite
Welinite is an IMA-recognized mineral species in the silicate class, with the chemical formula Mn²⁺₆(W⁶⁺ )(SiO₄)₂O₄(OH)₂.
It crystallizes in the hexagonal crystal system (space group P6_3). It is a member of the Welinite structural group.
Key properties: Mohs hardness 4; specific gravity 4.47; Pale reddish brown streak; Resinous luster; optically uniaxial.
IMA symbol Wln, IMA status: approved, named in 1966.
Found in small amounts, as fillings in fissures with other minerals cutting hausmannite ore (Lº a ngban, Sweden).
It is found associated with Adelite, sarkinite, barite, calcite (Lº angban, Sweden).
The name refers to Dr. Eric Welin, mineralogist and geochronologist, Swedish Museum of Natural History, Stockholm, Sweden.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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