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Anorthite is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl2Si2O8. Anorthite is found in igneous rocks.
Occurrence, Mineralogy & Overview
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plagioclase series rocks formula also endmember pure lunar feldspar p1 caal2si2o8 references rare mineral igneous crystal albite minerals na ca
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Anorthite | 2V angle | 78° to 83° | 1.00 | infobox |
| Anorthite | Birefringence | δ = 0.012–0.013 | 1.00 | infobox |
| Anorthite | Category | Tectosilicate minerals | 1.00 | infobox |
| Anorthite | Cleavage | Perfect good poor | 1.00 | infobox |
| Anorthite | Color | White, grayish, reddish | 1.00 | infobox |
| Anorthite | Crystal class | Pinacoidal (1) | 1.00 | infobox |
| Anorthite | Crystal habit | Anhedral to subhedral granular | 1.00 | infobox |
| Anorthite | Crystal system | Triclinic | 1.00 | infobox |
| Anorthite | Diaphaneity | Transparent to translucent | 1.00 | infobox |
| Anorthite | Formula | CaAl2Si2O8 or .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:bloc… | 1.00 | infobox |
| Anorthite | Formula mass | 278.203 g·mol−1 | 1.00 | infobox |
| Anorthite | Fracture | Uneven to conchoidal | 1.00 | infobox |
| Anorthite | Group | Feldspar group | 1.00 | infobox |
| Anorthite | IMA status | Grandfathered (1823) | 1.00 | infobox |
| Anorthite | IMA symbol | An | 1.00 | infobox |
| Anorthite | Luster | Vitreous | 1.00 | infobox |
| Anorthite | Melting point | 1550 ± 2°C | 1.00 | infobox |
| Anorthite | Mohs scale hardness | 6 | 1.00 | infobox |
| Anorthite | Optical properties | Biaxial (−) | 1.00 | infobox |
| Anorthite | Refractive index | nα = 1.573–1.577 nβ = 1.580–1.585 nγ = 1.585–1.590 | 1.00 | infobox |
| Anorthite | Series | Plagioclase feldspar series | 1.00 | infobox |
| Anorthite | Space group | P1 (no. 2) | 1.00 | infobox |
| Anorthite | Specific gravity | 2.72–2.75 | 1.00 | infobox |
| Anorthite | Streak | White | 1.00 | infobox |
| Anorthite | Strunz classification | 9.FA.35 | 1.00 | infobox |
| Anorthite | Tenacity | Brittle | 1.00 | infobox |
| Anorthite | Twinning | Common | 1.00 | infobox |
| Anorthite | Unit cell | a = 8.1768, b = 12.8768 c = 14.169 [Å]; α = 93.17° β = 115.85°, γ = 92.22°; Z = 8 | 1.00 | infobox |
| Anorthite | is a | calcium endmember of the plagioclase feldspar mineral series | 0.90 | text |
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