About: Biotite   Sponge Permalink

An Entity of Type : dbkwik:resource/6IIoeMLPkySiK--1vpcViQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyllite. Biotite was named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties.

AttributesValues
rdf:type
rdfs:label
  • Biotite
rdfs:comment
  • Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyllite. Biotite was named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties.
sameAs
dcterms:subject
Category
  • Dark mica series
opticalprop
  • Biaxial
mohs
  • 2(xsd:double)
Molweight
  • 433.53
Gravity
  • 2(xsd:double)
Name
  • Biotite
dispersion
  • r < v ;
  • r > v weak
ImageSize
  • 200(xsd:integer)
Caption
  • Thin tabular biotite aggregate
dbkwik:geology/pro...iPageUsesTemplate
streak
  • White
System
pleochroism
  • Strong
Color
  • Dark brown, greenish-brown, blackish-brown, yellow, white
tenacity
  • Brittle to flexible, elastic
fluorescence
  • None
cleavage
  • Perfect on the {001}
habit
  • Massive to platy
twinning
  • Common on the [310],
  • less common on the {001}
diaphaneity
  • Transparent to translucent to opaque
fracture
  • Micaceous
refractive
  • nα = 1.565–1.625
  • nβ = 1.605–1.675
  • nγ = 1.605–1.675
luster
  • Vitreous to pearly
Density
  • 2(xsd:double)
birefringence
  • δ = 0.03–0.07
abstract
  • Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers include siderophyllite. Biotite was named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, researched the optical properties of mica, discovering many unique properties. Biotite is a sheet silicate. Iron, magnesium, aluminium, silicon, oxygen, and hydrogen form sheets that are weakly bound together by potassium ions. It is sometimes called "iron mica" because it is more iron-rich than phlogopite. It is also sometimes called "black mica" as opposed to "white mica" (muscovite) – both form in some rocks, in some instances side-by-side.
is essential mineral(s) of
is accessory mineral(s) of
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