Holmquistite

Holmquistite from the Foote Mineral Co., Kings Mountain, North Carolina

General
Category| Inosilicate
Formula
(repeating unit)| (Li
2)(Mg
3Al
2)(Si

22)(OH)

Strunz classification| 9.DD.05
Dana classification| 66.1.2.9
Crystal system| Orthorhombic
Crystal class| Dipyramidal (mmm)
H-M Symbol: (2/m 2/m 2/m)
Space group| Pnma

Holmquistite is a lithium magnesium aluminium inosilicate mineral with chemical formula Li
2(Mg,Fe2+

3Al
2Si

22(OH)
2. It crystallizes in the orthorhombic crystal system as prismatic crystals up to 10 cm (3.9 in) or as massive aggregates. It has a Mohs hardness of 5–6 and a specific gravity of 2.95 to 3.13.

Color could vary from black, dark violet to light sky blue.

It occurs as metasomatic replacements on the margins of lithium rich pegmatites.

It was first described in 1913 from an occurrence in Utö, near Stockholm, Sweden. It was named for the Swedish petrologist Per Johan Holmquist (1866–1946).[2][3]

## References

1. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
2. ↑ Mindat with location data
3. ↑ Webmineral data

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