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Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5. This mineral was called andalousite by Delamétherie, who thought it came from Andalusia, Spain.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Andalusite | 2V angle | 71–86° | 1.00 | infobox |
| Andalusite | Birefringence | δ = 0.009 – 0.010 | 1.00 | infobox |
| Andalusite | Category | Nesosilicates | 1.00 | infobox |
| Andalusite | Cleavage | Good on {110}, poor on {100} | 1.00 | infobox |
| Andalusite | Color | Pink, violet, yellow, green, white, gray; in thin section, colorless to pink or green | 1.00 | infobox |
| Andalusite | Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | 1.00 | infobox |
| Andalusite | Crystal habit | As euhedral crystals or columnar aggregates having nearly square cross sections; fibrous compact to massive | 1.00 | infobox |
| Andalusite | Crystal system | Orthorhombic | 1.00 | infobox |
| Andalusite | Diaphaneity | Transparent to nearly opaque with inclusions | 1.00 | infobox |
| Andalusite | Dispersion | r < v strong | 1.00 | infobox |
| Andalusite | Formula | Al2SiO5 | 1.00 | infobox |
| Andalusite | Fracture | uneven to subconchoidal | 1.00 | infobox |
| Andalusite | IMA symbol | And | 1.00 | infobox |
| Andalusite | Luster | Vitreous | 1.00 | infobox |
| Andalusite | Mohs scale hardness | 6.5–7.5 | 1.00 | infobox |
| Andalusite | Optical properties | double refractive, biaxial negative; chiastolite has anomalous aggregate reaction. | 1.00 | infobox |
| Andalusite | Pleochroism | strongly trichroic | 1.00 | infobox |
| Andalusite | Refractive index | nα = 1.629 – 1.640 nβ = 1.633 – 1.644 nγ = 1.638 – 1.650 | 1.00 | infobox |
| Andalusite | Space group | Pnnm | 1.00 | infobox |
| Andalusite | Specific gravity | 3.17 (± .04) | 1.00 | infobox |
| Andalusite | Streak | White | 1.00 | infobox |
| Andalusite | Strunz classification | 9.AF.10 | 1.00 | infobox |
| Andalusite | Twinning | On {101}, rare | 1.00 | infobox |
| Andalusite | Ultraviolet fluorescence | non-fluorescent | 1.00 | infobox |
| Andalusite | Unit cell | a = 7.7980 Å, b = 7.9031 Å c = 5.5566 Å; Z = 4 | 1.00 | infobox |
| Andalusite | is a | aluminium nesosilicate mineral with the chemical formula Al2SiO5 | 0.90 | text |
| Andalusite | is a | aluminosilicate index mineral | 0.90 | text |
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