Orthoclase
Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed of orthoclase.
materials
primaryTopic
Orthoclase
Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below) is largely composed of orthoclase.
has abstract
Het mineraal orthoklaas is een ...... Het behoort tot de veldspaten.
@nl
L'ortoclasio è un minerale app ...... unicamente a nicol incrociati.
@it
La ortoclasa u ortosa es un mi ...... que la ortoclasa forma parte.
@es
Orthoclase, or orthoclase feld ...... argely composed of orthoclase.
@en
Orthoklas ist ein häufig vorko ...... raue bis braune Farbe annimmt.
@de
الأورثوكلاز (Orthoclase) هو صخ ...... صيغة الكيميائية له هي KAlSi3O8
@ar
正長石(せいちょうせき、orthoclase)は、鉱物(ケイ酸塩鉱物)の一種。長石グループの鉱物で、単斜晶系のカリ長石。
@ja
正长石多产自岩浆岩或变质岩。如花岗岩、正长岩、霞石正长岩、麻岩、片岩、流纹岩,有时也可在沉积岩中看到。正长石变质后,可能成为高岭石、绢云母、沸石等矿物。
@zh
thumbnail
Wikipage page ID
Wikipage revision ID
744,410,853
alters to
sericite or clay
birefringence
category
cleavage
Has perfect cleavage on {001} ...... ue to orthoclase's low relief.
color
Colorless, greenish, greyish yellow, white, pink
diagnostic
Distinguishable from microclin ...... from sanidine by a larger 2Vx.
diaphaneity
Transparent to translucent
dispersion
relatively strong
extinction
parallel to cleavage
formula
gravity
habit
Can be anhedral or euhedral. Grains are commonly elongate with a tabular appearance.
length slow/fast
no slow or fast length
luster
Vitreous, pearly on cleavage surfaces
opticalprop
Biaxial , 2V = 65–75
Other
Low negative relief
refractive
nα = 1.518–1.520
nβ = 1.522–1.524
nγ = 1.522–1.525
system
twinning
Typically displays Carlsbad tw ...... o been reported in orthoclase.
comment
Het mineraal orthoklaas is een ...... Het behoort tot de veldspaten.
@nl
L'ortoclasio è un minerale app ...... unicamente a nicol incrociati.
@it
La ortoclasa u ortosa es un mi ...... que la ortoclasa forma parte.
@es
Orthoclase, or orthoclase feld ...... argely composed of orthoclase.
@en
Orthoklas ist ein häufig vorko ...... üstsilikaten (Tektosilikaten).
@de
الأورثوكلاز (Orthoclase) هو صخ ...... صيغة الكيميائية له هي KAlSi3O8
@ar
正長石(せいちょうせき、orthoclase)は、鉱物(ケイ酸塩鉱物)の一種。長石グループの鉱物で、単斜晶系のカリ長石。
@ja
正长石多产自岩浆岩或变质岩。如花岗岩、正长岩、霞石正长岩、麻岩、片岩、流纹岩,有时也可在沉积岩中看到。正长石变质后,可能成为高岭石、绢云母、沸石等矿物。
@zh
label
Orthoclase
@en
Orthoklaas
@nl
Orthoklas
@de
Ortoclasa
@es
Ortoclasio
@it
أورثوكلاز
@ar
正長石
@ja
正長石
@zh
wasDerivedFrom
isPrimaryTopicOf
name
Orthoclase
@en