| General Information |
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| Chemical Formula | Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Holmquistite |
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| Mohs Hardness | 5 to 6Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 2.95 to 3.13Anthony et al, Handbook of mineralogy (2001) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | PerfectAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Holmquistite |
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| Refractive Index | 1.622 to 1.666Anthony et al, Handbook of mineralogy (2001) |
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| Optical Character | Biaxial/-Anthony et al, Handbook of mineralogy (2001) |
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| Pleochroism | Strong in shades of violet when dark-colored.Anthony et al, Handbook of mineralogy (2001) |
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| Dispersion | WeakAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Black, dark violet to light sky-blue; pale yellow to violet in thin section.Anthony et al, Handbook of mineralogy (2001) |
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| Transparency | Transparent,TranslucentAnthony et al, Handbook of mineralogy (2001) |
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| Lustre | VitreousAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Holmquistite |
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| Crystal System | OrthorhombicAnthony et al, Handbook of mineralogy (2001) |
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| Habit | As prismatic or acicular crystals, to 10 cm, typically striated. In columnar sheaflike aggregates, massive.Anthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | As metasomatic replacements near the outer margins of lithium-rich pegmatites.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Holmquistite information at mindat.org |
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