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Anthophyllite

Anthophyllite is an orthorhombic amphibole mineral: ☐Mg2Mg5Si8O22(OH)2 (☐ is for a vacancy, a point defect in the crystal structure), magnesium iron inosilicate hydroxide. Anthophyllite is polymorphic with cummingtonite. Some forms of anthophyllite are lamellar or fibrous and are classed as asbestos. The name is derived from the Latin word anthophyllum…

Occurrence, Occurrence in ultramafic rocks & Fibrous anthophyllite

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Occurrence

MetamorphismIgneous rocksDolomiticShalesOrthopyroxenes
11 related topics

Occurrence in ultramafic rocks

TalcCarbon dioxideMetamorphic reactionIsogradAntigorite
11 related topics

Fibrous anthophyllite

FinlandMatsubase, JapanTuusniemiOutokumpu
4 related topics

Overview

OrthorhombicAmphiboleMineralPoint defectMagnesium
12 related topics

Key facts & relationships

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2V angle
57° - 90°
Birefringence
δ = 0.017 – 0.023
Category
Inosilicates Amphibole
Cleavage
Perfect on {210}, imperfect on {010}, {100}
Color
Gray to green, brown, and beige
Crystal class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

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Overview

Occurrence

Occurrence in ultramafic rocks

Fibrous anthophyllite

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Map overview Semantic statistics

Anthophyllite

Nodes43
Edges42
Triples43
Avg. degree1.95
Density0.046512
Components1

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Anthophyllite

Top relations

related to Fibrous anthophyllite · 11
Anthophyllite → Fibrous, Finland, In Finland, It, Japan, Maljasalmi, Matsubase, Outokumpu, Paakkila, The, Tuusniemi
related to Occurrence in ultramafic rocks · 8
Anthophyllite → CO2, CO2-free, Higher, MgO, The, Thus, Ultramafic, XCO2
2V angle · 1
Anthophyllite → 57° - 90°
Birefringence · 1
Anthophyllite → δ = 0.017 – 0.023
Category · 1
Anthophyllite → Inosilicates Amphibole
Cleavage · 1
Anthophyllite → Perfect on {210}, imperfect on {010}, {100}
Color · 1
Anthophyllite → Gray to green, brown, and beige
Crystal class · 1
Anthophyllite → Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Crystal habit · 1
Anthophyllite → Rarely as distinct crystals. Commonly lamellar or fibrous.
Crystal system · 1
Anthophyllite → Orthorhombic

Important terminology Word statistics

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Important terminology

rocks ultramafic asbestos mineral fibrous metamorphic crystal also color orthorhombic retrograde carbon dioxide metamorphism olivine amphibole cleavage mg2mg5si8o22 oh lamellar

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Anthophyllite2V angle57° - 90°1.00infobox
AnthophylliteBirefringenceδ = 0.017 – 0.0231.00infobox
AnthophylliteCategoryInosilicates Amphibole1.00infobox
AnthophylliteCleavagePerfect on {210}, imperfect on {010}, {100}1.00infobox
AnthophylliteColorGray to green, brown, and beige1.00infobox
AnthophylliteCrystal classDipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)1.00infobox
AnthophylliteCrystal habitRarely as distinct crystals. Commonly lamellar or fibrous.1.00infobox
AnthophylliteCrystal systemOrthorhombic1.00infobox
AnthophylliteDiagnostic featuresCharacterized by clove brown color, but unless in crystals, difficult to distinguish from other amphiboles without optical and/or X-ray tests1.00infobox
AnthophylliteDiaphaneityTransparent to translucent1.00infobox
AnthophylliteFormula☐Mg2Mg5Si8O22(OH)21.00infobox
AnthophylliteIMA symbolAth1.00infobox
AnthophylliteLusterVitreous, pearly on cleavage1.00infobox
AnthophylliteMohs scale hardness5.5 – 61.00infobox
AnthophylliteOptical propertiesBiaxial (+)1.00infobox
AnthophylliteRefractive indexnα=1.598 – 1.674, nβ=1.605 – 1.685, nγ=1.615 – 1.697; indices increase with Fe content1.00infobox
AnthophylliteSpace groupPnma1.00infobox
AnthophylliteSpecific gravity2.85 – 3.21.00infobox
AnthophylliteStreakWhite to gray1.00infobox
AnthophylliteStrunz classification9.DE.051.00infobox
AnthophylliteTenacityBrittle; elastic when fibrous1.00infobox
AnthophylliteUnit cella = 18.5, b = 17.9 c = 5.28 [Å]; Z = 41.00infobox
Anthophylliteis aorthorhombic amphibole mineral0.90text

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