Albite
| Albite | |
|---|---|
| |
| General | |
| Category | Tectosilicate minerals |
| Group | Feldspar group |
| Series | Plagioclase feldspar series |
| Formula | NaAlSi 3O 8 (ideal endmember) (Na,Ca)AlSi 3O 8 (Na:Ca = 100:0 to 90:10) |
| IMA symbol | Ab |
| IMA status | Grandfathered (1815) |
| Strunz classification | 9.FA.35 |
| Dana classification | 76.1.3.1 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) |
| Space group | C1 (no. 2) |
| Unit cell |
|
| Identification | |
| Color | White to gray, blueish, greenish, reddish; may be chatoyant |
| Crystal habit | Crystals commonly tabular, divergent aggregates, granular, cleavable massive |
| Twinning | Common giving polysynthetic striae on {001} or {010} also contact, simple and multiple |
| Cleavage | Perfect on {001}, very good on {010}, imperfect on {110} |
| Fracture | Uneven to conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 6–6.5 |
| Luster | Vitreous, typically pearly on cleavages |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.60–2.65 |
| Optical properties | Biaxial (+) |
| Refractive index |
|
| Birefringence | δ = 0.010 |
| 2V angle | 85–90° (low); 52–54° (high) |
| Dispersion | r < v weak |
| Melting point | 1,100–1,120 °C (2,010–2,050 °F) |
| Other characteristics | Low- and high-temperature structural modifications are recognized |
| References | |
Albite is a plagioclase feldspar mineral. It is the sodium endmember of the plagioclase solid solution series. It represents a plagioclase with less than 10% anorthite content. The pure albite endmember has the formula NaAlSi
3O
8. It is a tectosilicate. Its color is usually pure white, hence its name from Latin, albus. It is a common constituent in felsic rocks.