albite

{{Infobox mineral | name = Albite | category = Tectosilicate minerals | group = Feldspar group | series = Plagioclase feldspar series | boxwidth = | boxbgcolor = | image = Albite - Crete (Kriti) Island, Greece.jpg | imagesize = | caption = | formula = (ideal endmember) (Na:Ca = 100:0 to 90:10) |IMAsymbol=Ab | IMAstatus = Grandfathered (1815) | molweight = | strunz = 9.FA.35 | dana = 76.1.3.1 | system = Triclinic | class = Pinacoidal () | symmetry = C (no. 2) | unit cell = | color = White to gray, blueish, greenish, reddish; may be chatoyant | 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 = 6–6.5 | luster = Vitreous, typically pearly on cleavages | polish = | refractive = | opticalprop = Biaxial (+) | birefringence = δ = 0.010 | dispersion = r < v weak | pleochroism = | 2V = 85–90° (low); 52–54° (high) | melt = | fluorescence= | absorption = | streak = White | gravity = 2.60–2.65 | density = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = 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 . It is a tectosilicate. Its color is usually pure white, hence its name from Latin, . It is a common constituent in felsic rocks.