Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2.68 to 2.72. The streak is white, like most silicates. The refractive index ranges from 1.559 to 1.573. Twinning is common. As with all plagioclase members, the crystal system is triclinic, and three directions of cleavage are present, two of which form nearly right angle prisms. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.
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Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It has an anorthite percentage (%An) of between 50 and 70. The specific gravity ranges from 2.68 to 2.72. The streak is white, like most silicates. The refractive index ranges from 1.559 to 1.573. Twinning is common. As with all plagioclase members, the crystal system is triclinic, and three directions of cleavage are present, two of which form nearly right angle prisms. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.
has abstract
Het mineraal labradoriet is ee ...... een synoniem voor labradoriet.
@nl
La labradorita o espectrolita ...... mauilita, radauita y silicita.
@es
La labradorite è una varietà d ...... e tutto lo spettro dei colori.
@it
La labradorite, est un minéral ...... arfois employé, est incorrect.
@fr
Labrador – minerał z gromady k ...... h. Opisany i nazwany w 1780 r.
@pl
Labradorit gilt wie Andesin he ...... nsgemäß 50 bis 70 % (An50-70).
@de
Labradorite ((Ca, Na)(Al, Si)4 ...... o, as well as in anorthosites.
@en
Labradorite ((Ca,Na)(Al,Si)4O8 ...... são designadas espectrolites.
@pt
Лабрадо́р — минерал из группы ...... с горной породой лабрадоритом.
@ru
اللابرادوريت هو أكثر البلاجيو ...... ر شيوعاً في استخدامه كمجوهرات.
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thumbnail
Wikipage page ID
Wikipage revision ID
743,389,696
2V
birefringence
δ = 0.008 - 0.010
Caption
Labradorite in a polished rock slab
category
class
cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
color
Gray, brown, greenish, blue, yellow, colorless
diaphaneity
Translucent to transparent
dispersion
fracture
Uneven to conchoidal
gravity
habit
Crystals typically thin and tabular, rhombic in cross section, striated; massive
luster
Vitreous to pearly on cleavages
opticalprop
Other
Labradorescence
refractive
nα = 1.554 - 1.563 nβ = 1.559 - 1.568 nγ = 1.562 - 1.573
system
twinning
Common by Albite, Pericline, Carlsbad, Baveno, or Manebach twin laws
unit cell
a = 8.155 Å, b = 12.84 Å
c = 10.16 Å; α = 93.5°
β = 116.25°, γ = 89.133°; Z = 6
subject
comment
Het mineraal labradoriet is ee ...... een synoniem voor labradoriet.
@nl
La labradorita o espectrolita ...... o una variedad de la anortita.
@es
La labradorite è una varietà d ...... e tutto lo spettro dei colori.
@it
La labradorite, est un minéral ...... , avec des traces de Fe;K;H2O.
@fr
Labrador – minerał z gromady k ...... h. Opisany i nazwany w 1780 r.
@pl
Labradorit gilt wie Andesin he ...... nsgemäß 50 bis 70 % (An50-70).
@de
Labradorite ((Ca, Na)(Al, Si)4 ...... o, as well as in anorthosites.
@en
Labradorite ((Ca,Na)(Al,Si)4O8 ...... s formam prismas quase rectos.
@pt
Лабрадо́р — минерал из группы ...... с горной породой лабрадоритом.
@ru
اللابرادوريت هو أكثر البلاجيو ...... ر شيوعاً في استخدامه كمجوهرات.
@ar
label
Labrador (minerał)
@pl
Labradoriet
@nl
Labradorit
@de
Labradorita
@es
Labradorite
@en
Labradorite
@fr
Labradorite
@it
Labradorite
@pt
Лабрадор (минерал)
@ru
لابرادوريت
@ar
sameAs
wasDerivedFrom
isPrimaryTopicOf
name
Labradorite
@en