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Thorianite

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Formula:
ThO2
System:
Isometric
Colour:
Dark grey, brown-black
Hardness:
6½ - 7
Name:
The name reflects its thorium content.

Classification of Thorianite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.DL.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
L : With large (+- medium-sized) cations; fluorite-type structures
5.1.1.2

5 : OXIDES CONTAINING URANIUM OR THORIUM
1 : AXO2·xH2O
7.10.10

7 : Oxides and Hydroxides
10 : Oxides of Zr and Th
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First Recorded Occurrence of Thorianite

Year of Discovery:
1904

Physical Properties of Thorianite

Resinous, Sub-Metallic
Colour:
Dark grey, brown-black
Streak:
Grey, grey-green to black
Hardness (Mohs):
6½ - 7
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001} poor.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
9.7 g/cm3 (Measured)    9.87 g/cm3 (Calculated)

Crystallography of Thorianite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Cell Parameters:
a = 5.6Å
Unit Cell Volume:
V 175.62 ų (Calculated from Unit Cell)
Morphology:
Cubic crystals, usually rounded to some degree (water worn).
Twinning:
Penetration twins on {111} very common.

Optical Data of Thorianite

Type:
Isotropic

Chemical Properties of Thorianite

Formula:
ThO2
Essential elements:
All elements listed in formula:
CAS Registry number:
1314-20-1

CAS Registry numbers are published by the American Chemical Society
Common Impurities:
U,Ce,La,Pb,TR

Relationship of Thorianite to other Species

Series:
Forms a series with Uraninite (see here)
4.DL.05Cerianite-(Ce)(Ce4+,Th)O2
4.DL.05UraniniteUO2
4.DL.05Zirkelite(Ti,Ca,Zr)O2-x
4.DL.05Aeschynite Group
4.DL.10CalzirtiteCaZr3TiO9
4.DL.10Tazheranite(Zr,Ti,Ca)O2-x
4.DL.10Hiärneite(Ca,Mn,Na)2(Zr,Mn3+)5(Sb,Ti,Fe)2O16
7.10.1BaddeleyiteZrO2
7.10.2ArkeliteZrO2
7.10.3PainiteCaZrAl9(BO3)O15
7.10.4SrilankiteZrTi2O6
7.10.5ZirconoliteCaZrTi2O7
7.10.6CalzirtiteCaZr3TiO9
7.10.7Tazheranite(Zr,Ti,Ca)O2-x
7.10.8Zirkelite(Ti,Ca,Zr)O2-x
7.10.9UhligiteCa3(Ti,Al,Zr)9O20 ?

Other Names for Thorianite

Name in Other Languages:
German:Thorianit
Simplified Chinese:方钍石
Spanish:Torianita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Thorianite

Reference List:
Coomaraswamy (1904), Spolia Ceylon.

Dunstan (1904), Nature: 69: 510, 533, 559.

Coomaraswamy (1906), Jb. Min.: I: 165.

Dunstan and Jones (1906), Royal Society of London, Proceedings: 77: 385.

Ogawa (1912), Tohku Im. Univ., Sc. Rep.: 1: 201.

Ogawa (1913), Jb. Min.: II: 12.

Goldschmidt and Thomassen (1923), Vidensk. Selskr., Oslo, Math.-Nat. Kl., No. 2.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 620-622.

US National Bureau of Standards, Circular (1953): 539(1): 57.

American Mineralogist (1974): 59: 378.

Internet Links for Thorianite

Specimens:
The following Thorianite specimens are currently listed for sale on minfind.com.

Localities for Thorianite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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