Anatase
Anatase is one of the three mineral forms of titanium dioxide, the other two being brookite and rutile. It is always found as small, isolated and sharply developed crystals, and like rutile, a more commonly occurring modification of titanium dioxide, it crystallizes in the tetragonal system; but, although the degree of symmetry is the same for both, there is no relation between the interfacial angles of the two minerals, except in the prism-zone of 45° and 90°. The common pyramid of anatase, parallel to the faces of which there are perfect cleavages, has an angle over the polar edge of 82°9', the corresponding angle of rutile being 56°52½'. It was on account of this steeper pyramid of anatase that the mineral was named, by René Just Haüy in 1801, from the Greek anatasis, "extension", the v
Anatase
Anatase is one of the three mineral forms of titanium dioxide, the other two being brookite and rutile. It is always found as small, isolated and sharply developed crystals, and like rutile, a more commonly occurring modification of titanium dioxide, it crystallizes in the tetragonal system; but, although the degree of symmetry is the same for both, there is no relation between the interfacial angles of the two minerals, except in the prism-zone of 45° and 90°. The common pyramid of anatase, parallel to the faces of which there are perfect cleavages, has an angle over the polar edge of 82°9', the corresponding angle of rutile being 56°52½'. It was on account of this steeper pyramid of anatase that the mineral was named, by René Just Haüy in 1801, from the Greek anatasis, "extension", the v
has abstract
Anatas (auch Oktaedrit oder ok ...... nur sehr selten natürlich vor.
@de
Anatase is one of the three mi ...... damantine than that of rutile.
@en
Anatase é uma das três formas ...... o, na zona-prisma de 45 e 90º.
@pt
Anataz (gr. anatasis = wydłuże ...... nerałów tytanu (np. ilmenitu).
@pl
Het mineraal anataas is een va ...... j de doorschijnende variëteit.
@nl
L'anatasio è una delle cinque ...... ngolo del rutilo è di 56°52½'.
@it
La anatasa —también conocida c ...... otros minerales tetragonales.
@es
L’anatase est une espèce minér ...... ne, de vanadium et de niobium.
@fr
Анатаз (от др.-греч. ἀνάτασις ...... 620—650 °C переходит в рутил.
@ru
鋭錐石(えいすいせき、anatase)は、鉱物(酸化鉱物)の一種。アナテースあるいはアナタースともいう。
@ja
thumbnail
Wikipage page ID
Wikipage revision ID
737,643,118
birefringence
category
cleavage
Perfect on [001] and [011]
color
Black, reddish to yellowish brown, dark blue, gray
diaphaneity
Transparent to nearly opaque
fracture
gravity
habit
Pyramidal , tabular .
luster
Adamantine to splendent, metallic
mohs
molweight
opticalprop
Uniaxial , anomalously biaxial in deeply colored crystals
pleochroism
refractive
nω = 2.561, nε = 2.488
streak
pale yellowish white
symmetry
Space group: I41/amd
system
Ditetragonal dipyramidal class
tenacity
twinning
unit cell
a = 3.7845, c = 9.5143 [Å]; Z = 4
hypernym
comment
Anatas (auch Oktaedrit oder ok ...... nur sehr selten natürlich vor.
@de
Anatase is one of the three mi ...... k anatasis, "extension", the v
@en
Anatase é uma das três formas ...... o, na zona-prisma de 45 e 90º.
@pt
Anataz (gr. anatasis = wydłuże ...... nerałów tytanu (np. ilmenitu).
@pl
Het mineraal anataas is een va ...... j de doorschijnende variëteit.
@nl
L'anatasio è una delle cinque ...... ngolo del rutilo è di 56°52½'.
@it
La anatasa —también conocida c ...... otros minerales tetragonales.
@es
L’anatase est une espèce minér ...... ne, de vanadium et de niobium.
@fr
Анатаз (от др.-греч. ἀνάτασις ...... каций TiO2 — рутила и брукита.
@ru
鋭錐石(えいすいせき、anatase)は、鉱物(酸化鉱物)の一種。アナテースあるいはアナタースともいう。
@ja
label
Anataas
@nl
Anatas
@de
Anatasa
@es
Anatase
@en
Anatase
@fr
Anatase
@pt
Anatasio
@it
Anataz
@pl
Анатаз
@ru
鋭錐石
@ja
wasDerivedFrom
depiction
isPrimaryTopicOf
name
Anatase
@en