Thorianite
A valid IMA mineral species - grandfathered
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About Thorianite
Formula:
ThO2
Colour:
Black, brownish black, dark gray, dark reddish brown
Lustre:
Resinous, Sub-Metallic
Hardness:
6½ - 7
Specific Gravity:
9.7 - 9.8
Crystal System:
Isometric
Member of:
Name:
The name reflects its thorium content.
Unique Identifiers
Mindat ID:
3944
Long-form identifier:
mindat:1:1:3944:0
GUID
(UUID V4):
(UUID V4):
b26e758a-a55e-44ab-ae6f-2116c06d7bf9
Classification of Thorianite
Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
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
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
5 : OXIDES CONTAINING URANIUM OR THORIUM
1 : AXO2·xH2O
7.10.10
7 : Oxides and Hydroxides
10 : Oxides of Zr and Th
7 : Oxides and Hydroxides
10 : Oxides of Zr and Th
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Tho | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Tho | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Thorianite
Resinous, Sub-Metallic
Transparency:
Opaque
Colour:
Black, brownish black, dark gray, dark reddish brown
Comment:
may have a bronzy tarnish
Streak:
Grey, grey-green to black
Hardness:
6½ - 7 on Mohs scale
Hardness:
VHN100=1132 - 1278 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001} poor.
{001} poor.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
9.7 - 9.8 g/cm3 (Measured) 9.991 g/cm3 (Calculated)
Optical Data of Thorianite
Anisotropism:
may show weak anomalous anisotropism
Colour in reflected light:
gray
Internal Reflections:
red-brown
Chemical Properties of Thorianite
Formula:
ThO2
Elements listed:
CAS Registry number:
Common Impurities:
U,Ce,La,Pb,TR
Crystallography of Thorianite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Setting:
Fm3m
Cell Parameters:
a = 5.595 Å
Unit Cell V:
175.15 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Cubic crystals, usually rounded to some degree (water worn).
Twinning:
Penetration twins on {111} very common.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
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0011725 | Thorianite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Fluorite structure Crystal Structures 1 239-444 | 1963 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.234 Å | (100) |
1.689 Å | (64) |
1.980 Å | (58) |
2.800 Å | (35) |
1.284 Å | (26) |
1.1432 Å | (20) |
1.0779 Å | (19) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
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Near-surface Processes | |
26 : Hadean detrital minerals | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites | |
36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Thorianite
Geological Setting of Type Material:
accessory mineral in granite pegmatites
Reference:
Dunstan W (1904) The occurrence of thorium in Ceylon. Nature 69, 510-511
Synonyms of Thorianite
Other Language Names for Thorianite
Varieties of Thorianite
Aldanite | A Pb-bearing variety of Thorianite with up to 12 wt.% PbO. Originally reported from Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. |
Cerian Thorianite | A thorianite containing cerium. |
Uranothorianite | A name for a mineral intermediate between uraninite and thorianite, i.e. a member of the Thorianite-Uraninite Series. |
Relationship of Thorianite to other Species
Member of:
Other Members of this group:
Cerianite-(Ce) | (Ce4+,Th)O2 | Iso. m3m (4/m 3 2/m) : Fm3m |
Uraninite | UO2 | Iso. m3m (4/m 3 2/m) : Fm3m |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
12 photos of Thorianite associated with Calcite | CaCO3 |
5 photos of Thorianite associated with Guarinite | (Na, Ca, Zr, Si, F, O) |
5 photos of Thorianite associated with Diopside | CaMgSi2O6 |
4 photos of Thorianite associated with Phlogopite | KMg3(AlSi3O10)(OH)2 |
3 photos of Thorianite associated with Fluorapatite | Ca5(PO4)3F |
3 photos of Thorianite associated with Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
2 photos of Thorianite associated with Pyroxene Group | ADSi2O6 |
2 photos of Thorianite associated with Baddeleyite | ZrO2 |
2 photos of Thorianite associated with Hiortdahlite | Na2Ca4(Ca0.5Zr0.5)Zr(Si2O7)2OF3 |
2 photos of Thorianite associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Related Minerals - Strunz-mindat Grouping
4.DL.05 | Cerianite-(Ce) | (Ce4+,Th)O2 |
4.DL.05 | Uraninite | UO2 |
4.DL.05 | Zirkelite | (Ti,Ca,Zr)O2-x |
4.DL.05 | Aeschynite Group | AD2O6 |
4.DL.10 | Calzirtite | Ca2Zr5Ti2O16 |
4.DL.10 | Tazheranite | (Zr,Ti,Ca)(O,◻)2 |
4.DL.10 | Hiärneite | Ca2Zr4Mn3+SbTiO16 |
4.DL.15 | Vorlanite | Ca(U6+)O4 |
Other Information
Magnetism:
Diamagnetic
Notes:
radioactive
Health Risks:
Contains thorium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.
Internet Links for Thorianite
mindat.org URL:
https://www.mindat.org/min-3944.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Thorianite
Reference List:
Localities for Thorianite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Angola | |
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China | |
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Czech Republic | |
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DR Congo | |
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Egypt | |
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Finland | |
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Germany | |
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| Schmitt, Axel K, Klitzke, Malte, Gerdes, Axel, Schäfer, Christof (2017) Zircon Hafnium–Oxygen Isotope and Trace Element Petrochronology of Intraplate Volcanic Rocks from the Eifel (Germany) and Implications for Mantle versus Crustal Origins of Zircon Megacrysts. Journal of Petrology, 58 (9). 1841-1870 doi:10.1093/petrology/egx075 |
Greenland | |
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Hungary | |
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India | |
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Iran | |
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Iraq | |
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Italy | |
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Japan | |
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Kyrgyzstan | |
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Madagascar | |
| Rasoamalala, V., Salvi, S., Béziat, D., Ursule, J.-Ph., Cuney, M., de Parseval, Ph., Guillaume, D., Moine, B., Andriamampihantona, J. (2014) Geology of bastnaesite and monazite deposits in the Ambatofinandrahana area, central part of Madagascar: An overview. Journal of African Earth Sciences, 94. 128-140 doi:10.1016/j.jafrearsci.2013.11.009 |
| Frank K. Mazdab collectionsample FKM-40; https://www.rockptx.com/fkm-26-to-fkm-50/#FKM-40 |
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Mali | |
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Mauritania | |
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Mexico | |
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Mongolia | |
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Mozambique | |
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Myanmar | |
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Namibia | |
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Nepal | |
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Niger | |
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Norway | |
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Oman | |
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Paraguay | |
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Romania | |
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Russia | |
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[var: Aldanite] | |
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Slovakia | |
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South Africa | |
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Spain | |
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Sri Lanka | |
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Sweden | |
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Tajikistan | |
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Tanzania | |
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Turkey | |
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UK | |
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Ukraine | |
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USA | |
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Zambia | |
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Quick NavTopAbout ThorianiteUnique IdentifiersClassification Mineral SymbolsPhysical Properties Optical Data Chemical Properties Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesVarietiesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Amboasary Sud District, Anosy, Madagascar