Folvikite Locality: Kitteln Mine (TL), Filipstad, Värmland, Sweden — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0
Folvikite
Folvikite is an IMA-recognized mineral species in the borate class, with the chemical formula Sb⁵⁺Mn³⁺(Mg,Mn²⁺)₁₀O₈(BO₃)₄.
It crystallizes in the monoclinic crystal system (space group P2).
Key properties: Mohs hardness 6; specific gravity 4.14; Reddish brown streak; Strongly submetallic luster.
IMA symbol Fvk, IMA status: approved, named in 2016.
A primary skarn mineral.
It is found associated with Hausmannite, tegengrenite, a Mg-analogue of sonolite or jerrygibbsite, calcite.
The mineral was named to honor Harald O. Folvik (b. 1941).
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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