Holmquistite is a lithium magnesium aluminium inosilicate mineral with chemical formula . It crystallizes in the

orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...

crystal system as prismatic crystals up to 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 Stockholm () is the Capital city, capital and List of urban areas in Sweden by population, largest city of Sweden as well as the List of urban areas in the Nordic countries, largest urban area in Scandinavia. Approximately 980,000 people liv ...

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

. It was named for the

Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...

petrologist Per Johan Holmquist (1866–1946).Mindat with location data
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References

Inosilicates Orthorhombic minerals Minerals in space group 62 {{silicate-mineral-stub