Thorianite
Thorianite is a rare thorium oxide mineral, ThO2. It was originally described by Ananda Coomaraswamy in 1904 as uraninite, but recognized as a new species by Wyndham R. Dunstan. It was so named on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium. Helium is present, and the mineral is slightly less radioactive than pitchblende, but is harder to shield due to its high energy gamma rays. It is common in the alluvial gem-gravels of Sri Lanka, where it occurs mostly as water worn, small, heavy, black, cubic crystals. The largest crystals are usually near 1.5 cm. Larger crystals, up to 6 cm (2.4 in), have been reported from Madagascar.
primaryTopic
Thorianite
Thorianite is a rare thorium oxide mineral, ThO2. It was originally described by Ananda Coomaraswamy in 1904 as uraninite, but recognized as a new species by Wyndham R. Dunstan. It was so named on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium. Helium is present, and the mineral is slightly less radioactive than pitchblende, but is harder to shield due to its high energy gamma rays. It is common in the alluvial gem-gravels of Sri Lanka, where it occurs mostly as water worn, small, heavy, black, cubic crystals. The largest crystals are usually near 1.5 cm. Larger crystals, up to 6 cm (2.4 in), have been reported from Madagascar.
has abstract
A Torianita (ThO2) é um minera ...... res (máximo de 6 cm e 2.2 kg).
@pt
La thorianite est un minéral f ...... U, Ce, La, Pb et terres rares.
@fr
La thorianite è un minerale contenente torio, dal quale prende il nome.
@it
La torianita es un mineral rar ...... los) y proceden de Madagascar.
@es
Thorianit (chemisch: Thoriumdi ...... ltnis durch Uran ersetzt sein.
@de
Thorianite is a rare thorium o ...... been reported from Madagascar.
@en
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739,166,698
Caption
Group of interpenetrating twinned thorite crystals from Ambatofotsy, Madagascar
category
cleavage
Poor/Indistinct
color
Dark gray, brown-black
diaphaneity
Opaque, translucent on thin edges
formula
Thorium oxide, ThO2
fracture
Irregular to uneven, sub-conchoidal
gravity
habit
Cubic crystals, usually rounded to some degree in detrital deposits
luster
Resinous, sub-metallic
mohs
opticalprop
refractive
n = 2.20 – 2.35
streak
Grey, grey green to black
symmetry
system
Hexoctahedral class
twinning
Penetration twins on {111} common
unit cell
a = 5.595 Å; Z = 4
subject
comment
A Torianita (ThO2) é um minera ...... res (máximo de 6 cm e 2.2 kg).
@pt
La thorianite est un minéral f ...... U, Ce, La, Pb et terres rares.
@fr
La thorianite è un minerale contenente torio, dal quale prende il nome.
@it
La torianita es un mineral rar ...... imio (praseodimio y neodimio).
@es
Thorianit (chemisch: Thoriumdi ...... s kein gewöhnlicher Stein ist.
@de
Thorianite is a rare thorium o ...... been reported from Madagascar.
@en
label
Thorianit
@de
Thorianite
@en
Thorianite
@fr
Thorianite
@it
Torianita
@es
Torianita
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wasDerivedFrom
isPrimaryTopicOf
name
Thorianite
@en