Ferro-holmquistite
A variety of Holmquistite Root Name Group
What is Ferro-holmquistite?
Holmquistite is a lithium magnesium aluminium inosilicate mineral with chemical formula Li2(Mg,Fe2+)3Al2Si8O22(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).
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Quick Facts
Physical Properties
- Color
- Black, dark-violet, light sky-blue.
- Hardness (Mohs)
- 5 - 6
- Density
- 3.145 g/cm³
- Streak
- White with a sky-blue tinge (?)
Chemical Properties
- Chemical Formula
- ☐{Li2}{Fe2+3Al2}(Si8O22)(OH)2 The holmquistite group comprises orthorhombic amphiboles in the lithium amphibole subgroup. Holmquistite is defined with Fe2+Mg and Al>Fe3+ in the C position.
- Elements
- Al, Fe, H, Li, O, Si
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