About: Anorthite   Sponge Permalink

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

Anorthite is the calcium endmember of plagioclase feldspar. Plagioclase is an abundant mineral in the Earth's crust. The formula of pure anorthite is CaAl2Si2O8.

AttributesValues
rdf:type
rdfs:label
  • Anorthite
rdfs:comment
  • Anorthite is the calcium endmember of plagioclase feldspar. Plagioclase is an abundant mineral in the Earth's crust. The formula of pure anorthite is CaAl2Si2O8.
sameAs
dcterms:subject
Category
  • Feldspar mineral
opticalprop
  • Biaxial
mohs
  • 6(xsd:integer)
Gravity
  • 2(xsd:double)
Name
  • Anorthite
symmetry
  • Triclinic pinacoidal
Caption
  • Anorthite crystals in a basalt vug from Vesuvius
dbkwik:geology/pro...iPageUsesTemplate
2V
  • 78(xsd:integer)
formula
  • CaAl2Si2O8
System
strunz
  • 9(xsd:integer)
Color
  • White, grayish, reddish
unit cell
  • a = 8.1768 Å, b = 12.8768 Å, c = 14.169 Å; α = 93.17°, β = 115.85°, γ = 92.22°; Z = 8
tenacity
  • Brittle
cleavage
  • Perfect [001] good [010] poor [110]
habit
  • Anhedral to subhedral granular
twinning
  • Common
diaphaneity
  • Transparent to translucent
fracture
  • Uneven to concoidal
refractive
  • nα = 1.573 – 1.577 nβ = 1.580 – 1.585 nγ = 1.585 – 1.590
luster
  • Vitreous
birefringence
  • δ = 0.012 – 0.013
abstract
  • Anorthite is the calcium endmember of plagioclase feldspar. Plagioclase is an abundant mineral in the Earth's crust. The formula of pure anorthite is CaAl2Si2O8.
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