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Zoisite, first known as saualpite, after its type locality, is a calcium aluminum hydroxy sorosilicate. Its chemical formula is Ca2Al3(SiO4)(Si2O7)O(OH). It was formerly considered a member of the epidote group.
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crystals tanzanite thulite mineral ca2al3 sio4 si2o7 oh blue 10 sorosilicate orthorhombic known found parallel principal axis variety zois prismatic
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Zoisite | Birefringence | 0.006–0.018 | 1.00 | infobox |
| Zoisite | Category | Sorosilicate | 1.00 | infobox |
| Zoisite | Cleavage | Perfect {010} imperfect {100} | 1.00 | infobox |
| Zoisite | Color | White, gray, greenish brown, greenish gray, pink, blue, purple | 1.00 | infobox |
| Zoisite | Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | 1.00 | infobox |
| Zoisite | Crystal habit | Prismatic crystals with striations; massive to columnar | 1.00 | infobox |
| Zoisite | Crystal system | Orthorhombic | 1.00 | infobox |
| Zoisite | Dana classification | 58.2.1b.1 | 1.00 | infobox |
| Zoisite | Diaphaneity | Transparent to translucent | 1.00 | infobox |
| Zoisite | Formula | Ca2Al3(SiO4)(Si2O7)O(OH) | 1.00 | infobox |
| Zoisite | Fracture | Uneven to conchoidal | 1.00 | infobox |
| Zoisite | IMA symbol | Zo | 1.00 | infobox |
| Zoisite | Luster | Vitreous, pearly on cleavage surfaces | 1.00 | infobox |
| Zoisite | Mohs scale hardness | 6 to 7 | 1.00 | infobox |
| Zoisite | Optical properties | biaxial positive | 1.00 | infobox |
| Zoisite | Pleochroism | X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green | 1.00 | infobox |
| Zoisite | Refractive index | nα = 1.696 – 1.700 nβ = 1.696 – 1.702 nγ = 1.702 – 1.718 | 1.00 | infobox |
| Zoisite | Space group | Pnma | 1.00 | infobox |
| Zoisite | Specific gravity | 3.10–3.36 | 1.00 | infobox |
| Zoisite | Streak | White or colorless | 1.00 | infobox |
| Zoisite | Strunz classification | 9.BG.10 | 1.00 | infobox |
| Zoisite | Tanzanite | Gem-quality zoisite, blue-purple | 1.00 | infobox |
| Zoisite | Thulite | Pink | 1.00 | infobox |
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