Oligoclase
Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters it is intermediate between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8). The albite:anorthite molar ratio ranges from 90:10 to 70:30. Oligoclase is a high sodium feldspar crystallizing in the triclinic system. The Mohs hardness is 6 to 6.5 and the specific gravity is 2.64 to 2.66. The refractive indices are: nα=1.533–1.543, nβ=1.537–1.548, and nγ=1.542–1.552. In color it is usually white, with shades of grey, green, or red.
composition
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Oligoclase
Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters it is intermediate between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8). The albite:anorthite molar ratio ranges from 90:10 to 70:30. Oligoclase is a high sodium feldspar crystallizing in the triclinic system. The Mohs hardness is 6 to 6.5 and the specific gravity is 2.64 to 2.66. The refractive indices are: nα=1.533–1.543, nβ=1.537–1.548, and nγ=1.542–1.552. In color it is usually white, with shades of grey, green, or red.
has abstract
Het mineraal oligoklaas of zon ...... Het behoort tot de veldspaten.
@nl
L'oligoclasio è un minerale de ...... somiglianza con lo spodumene.
@it
La oligoclasa es un mineral de ...... tita, amausita u oligoclasita.
@es
L’oligoclase est un minéral de ...... t plutôt traitées en cabochon.
@fr
Oligoclase is a rock-forming m ...... shades of grey, green, or red.
@en
Oligoclase ou oligoclásio é um ...... ortita varia de 90:10 a 70:30.
@pt
Oligoklas (gr. ὀλίγος oligos f ...... Gelb, Rot, Grün, vielfarbig).
@de
Oligoklaz – minerał z grupy k ...... się łupliwości tego minerału.
@pl
Олигокла́з (от др.-греч. ὀλίγο ...... 8 и 70—90 % альбита NaAlSi3O8.
@ru
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Oligoclase from Chihuahua, Mexico
category
class
color
usually white, with shades of grey, green, or red.
gravity
refractive
nα=1.533–1.543; nβ=1.537–1.548; nγ=1.542–1.552
system
hypernym
comment
Het mineraal oligoklaas of zon ...... Het behoort tot de veldspaten.
@nl
L'oligoclasio è un minerale de ...... somiglianza con lo spodumene.
@it
La oligoclasa es un mineral de ...... omo una variedad de la albita.
@es
L’oligoclase est un minéral de ...... t plutôt traitées en cabochon.
@fr
Oligoclase is a rock-forming m ...... shades of grey, green, or red.
@en
Oligoclase ou oligoclásio é um ...... ortita varia de 90:10 a 70:30.
@pt
Oligoklas (gr. ὀλίγος oligos f ...... Gelb, Rot, Grün, vielfarbig).
@de
Oligoklaz – minerał z grupy k ...... się łupliwości tego minerału.
@pl
Олигокла́з (от др.-греч. ὀλίγο ...... 8 и 70—90 % альбита NaAlSi3O8.
@ru
label
Oligoclasa
@es
Oligoclase
@en
Oligoclase
@fr
Oligoclase
@pt
Oligoclasio
@it
Oligoklaas
@nl
Oligoklas
@de
Oligoklaz
@pl
Олигоклаз
@ru
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depiction
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Oligoclase
@en