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Albite

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 NaAlSi3O8. It is a tectosilicate. Its color is usually pure white, hence its name from Latin, albus. It is a common constituent in felsic…

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2V angle
85–90° (low); 52–54° (high)
Birefringence
δ = 0.010
Category
Tectosilicate minerals
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Color
White to gray, blueish, greenish, reddish; may be chatoyant
Crystal class
Pinacoidal (1)

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Albite

Nodes43
Edges42
Triples60
Avg. degree1.95
Density0.046512
Components1

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Albite

Top relations

related to Properties · 9
Albite → Although, Arizona, High, Its, Mohs, The, There, Upon, Winslow
related to Discovery · 4
Albite → Dalarna, Falun, Finnbo, Sweden
related to Use · 4
Albite → Alexander Fersman, One, There, White Sea
Refractive index · 3
Albite → nα = 1.528–1.533, nβ = 1.532–1.537, nγ = 1.538–1.542
Unit cell · 3
Albite → a = 8.16, b = 12.87, c = 7.11 [Å]; α = 93.45°, β = 116.4°, γ = 90.28°; Z = 4
related to Occurrence · 2
Albite → It, Minerals
2V angle · 1
Albite → 85–90° (low); 52–54° (high)
Birefringence · 1
Albite → δ = 0.010
Category · 1
Albite → Tectosilicate minerals
Cleavage · 1
Albite → Perfect on {001}, very good on {010}, imperfect on {110}

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Important terminology

plagioclase mineral endmember triclinic crystal also 10 white feldspar tectosilicate often 100 pure occurrence c1 050 series formula naalsi 3o

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Albite2V angle85–90° (low); 52–54° (high)1.00infobox
AlbiteBirefringenceδ = 0.0101.00infobox
AlbiteCategoryTectosilicate minerals1.00infobox
AlbiteCleavagePerfect on {001}, very good on {010}, imperfect on {110}1.00infobox
AlbiteColorWhite to gray, blueish, greenish, reddish; may be chatoyant1.00infobox
AlbiteCrystal classPinacoidal (1)1.00infobox
AlbiteCrystal habitCrystals commonly tabular, divergent aggregates, granular, cleavable massive1.00infobox
AlbiteCrystal systemTriclinic1.00infobox
AlbiteDana classification76.1.3.11.00infobox
AlbiteDiaphaneityTransparent to translucent1.00infobox
AlbiteDispersionr < v weak1.00infobox
AlbiteFormulaNaAlSi 3O 8 (ideal endmember) (Na,Ca)AlSi 3O 8 (Na:Ca = 100:0 to 90:10)1.00infobox
AlbiteFractureUneven to conchoidal1.00infobox
AlbiteGroupFeldspar group1.00infobox
AlbiteIMA statusGrandfathered (1815)1.00infobox
AlbiteIMA symbolAb1.00infobox
AlbiteLusterVitreous, typically pearly on cleavages1.00infobox
AlbiteMelting point1,100–1,120 °C (2,010–2,050 °F)1.00infobox
AlbiteMohs scale hardness6–6.51.00infobox
AlbiteOptical propertiesBiaxial (+)1.00infobox
AlbiteOther characteristicsLow- and high-temperature structural modifications are recognized1.00infobox
AlbiteRefractive indexnα = 1.528–1.5331.00infobox
AlbiteRefractive indexnβ = 1.532–1.5371.00infobox
AlbiteRefractive indexnγ = 1.538–1.5421.00infobox
AlbiteSeriesPlagioclase feldspar series1.00infobox
AlbiteSpace groupC1 (no. 2)1.00infobox
AlbiteSpecific gravity2.60–2.651.00infobox
AlbiteStreakWhite1.00infobox
AlbiteStrunz classification9.FA.351.00infobox
AlbiteTenacityBrittle1.00infobox

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