Douglasite
Douglasite is an IMA-recognized mineral species in the halide class, with the chemical formula K₂Fe²⁺Cl₄·2H₂O.
Key properties: specific gravity 2.16; Vitreous luster; optically uniaxial.
IMA symbol Dgl, grandfathered status — known before the IMA’s founding, named in 1880.
Found in a halite–potash deposit.
It is found associated with Carnallite, sylvite, halite.
The name is derived from the locality, Douglashall, Germany, at which it occurs.
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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