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Biotite

Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe)3AlSi3O10(F,OH)2. It is primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral…

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Birefringence
δ = 0.03–0.07
Category
Phyllosilicate minerals
Cleavage
Perfect on the {001}
Color
Dark brown, greenish-brown, blackish-brown, yellow
Crystal class
Prismatic (2/m) (same H-M symbol)
Crystal habit
Massive to platy

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Biotite

Nodes91
Edges90
Triples61
Avg. degree1.98
Density0.021978
Components1

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Biotite

Top relations

related to Occurrence · 14
Biotite → An, Bancroft, Dolomites, For, It, Members, Monzoni, Mount Vesuvius, New England, North Carolina USA, Ontario Canada, Other, Sudbury, Virginia
related to Properties · 7
Biotite → Although, However, It, Like, Mohs, The, When
related to Structure · 7
Biotite → In, It, Like, The, The TOT, TOT, TOT-c
is a · 3
Biotite → common group of phyllosilicate minerals within the mica group, essential phenocryst in some varieties of lamprophyre, trioctahedral sheet having the structure of a sheet of the mineral brucite
related to Optical properties · 3
Biotite → Basal, In, Under
Birefringence · 1
Biotite → δ = 0.03–0.07
Category · 1
Biotite → Phyllosilicate minerals
Cleavage · 1
Biotite → Perfect on the {001}
Color · 1
Biotite → Dark brown, greenish-brown, blackish-brown, yellow
Crystal class · 1
Biotite → Prismatic (2/m) (same H-M symbol)

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Important terminology

mica sheets sheet iron ions magnesium group structure thin crystal oxygen form rocks found section tot many minerals trioctahedral cleavage

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
BiotiteBirefringenceδ = 0.03–0.071.00infobox
BiotiteCategoryPhyllosilicate minerals1.00infobox
BiotiteCleavagePerfect on the {001}1.00infobox
BiotiteColorDark brown, greenish-brown, blackish-brown, yellow1.00infobox
BiotiteCrystal classPrismatic (2/m) (same H-M symbol)1.00infobox
BiotiteCrystal habitMassive to platy1.00infobox
BiotiteCrystal systemMonoclinic1.00infobox
BiotiteDiaphaneityTransparent to translucent to opaque1.00infobox
BiotiteDispersionr < v (Fe rich); r > v weak (Mg rich)1.00infobox
BiotiteFormula.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:block;text-align:l…1.00infobox
BiotiteFractureMicaceous1.00infobox
BiotiteGroupMica group, trioctahedral mica group, biotite subgroup1.00infobox
BiotiteIMA symbolBt1.00infobox
BiotiteLusterVitreous to pearly1.00infobox
BiotiteManganophylliteK(Fe,Mg,Mn)3AlSi3O10(OH)21.00infobox
BiotiteMohs scale hardness2.5–3.01.00infobox
BiotiteOptical propertiesBiaxial (-)1.00infobox
BiotitePleochroismStrong1.00infobox
BiotiteRefractive indexnα = 1.565–1.625 nβ = 1.605–1.675 nγ = 1.605–1.6751.00infobox
BiotiteSpace groupC2/m1.00infobox
BiotiteSpecific gravity2.7–3.31.00infobox
BiotiteStreakWhite1.00infobox
BiotiteTenacityBrittle to flexible, elastic1.00infobox
BiotiteTwinningCommon on the , less common on the {001}1.00infobox
BiotiteUltraviolet fluorescenceNone1.00infobox
Biotiteis acommon group of phyllosilicate minerals within the mica group0.90text
Biotiteis atrioctahedral sheet having the structure of a sheet of the mineral brucite0.90text
Biotiteis aessential phenocryst in some varieties of lamprophyre0.90text

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