Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Uraninite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
UO2
System:
Isometric
Colour:
Black, brownish-black, ...
Lustre:
Greasy, Sub-Metallic, Dull
Hardness:
5 - 6
Name:
Re-named in 1845 by Wilhelm Karl von Haidinger for its composition containing uranium. Originally recognized before the element uranium was known and called "schwarz beck-erz" by Franz Ernst Brückmann in 1727. Subsequently described with several names including "pseudogalena" and "pitch-like zinc-blende" by Johan Gottschalk Wallerius (Vallerius) in 1747. Named pechblende by Axel Cronstedt in 1758. Named "uranerz" by Martin Klaproth after he discovered the element uranium in this mineral. Many spelling variations of the above names known.
Uraninite Group. Thorianite-Uraninite Series.

Occurs in granitic and syenitic pegmatites. Colloform crusts in high temperature hydrothermal veins. In quartz-pebble conglomerates.

Classification of Uraninite

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
5.1.1.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
1 : AXO2·xH2O
7.16.1

7 : Oxides and Hydroxides
16 : Oxides of U
mindat.org URL:
http://www.mindat.org/min-4102.html
Please feel free to link to this page.

Type Occurrence of Uraninite

Year of Discovery:
1772

Physical Properties of Uraninite

Greasy, Sub-Metallic, Dull
Diaphaneity (Transparency):
Opaque
Colour:
Black, brownish-black, greyish, greenish; green-gray (thin fragments)
Streak:
Brownish black, grayish, olive-green
Hardness (Mohs):
5 - 6
Hardness (Vickers):
VHN50=499 - 548 kg/mm2
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
10.63 - 10.95 g/cm3 (Measured)    10.88 g/cm3 (Calculated)
Comment:
Decreasing with oxidation to low as 6.5

Crystallography of Uraninite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Cell Parameters:
a = 5.4682Å
Unit Cell Volume:
V 163.51 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Octahedral, cubo-octahedral, and cubic crystals; dodecahedrons less common. Massive, botryoidal, reniform, banded, columnar, curved lamellar.
Twinning:
On {111}, rare.
Comment:
Synthetic material UO2.03

Optical Data of Uraninite

Type:
Isotropic
Type:
Isotropic
Colour in reflected light:
Light grey with brownish tint
Internal Reflections:
Dark brown

Chemical Properties of Uraninite

Formula:
UO2
Essential elements:
All elements listed in formula:
CAS Registry number:
1344-57-6

CAS Registry numbers are published by the American Chemical Society
Common Impurities:
Th,Zr,Pb,Ra,Ac,Po,Ce,Y,Er,La

Relationship of Uraninite to other Species

Series:
Forms a series with Thorianite (see here)
4.DL.05Cerianite-(Ce)(Ce4+,Th)O2
4.DL.05ThorianiteThO2
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
7.16.2Schoepite(UO2)8O2(OH)12 · 12H2O
7.16.3ParaschoepiteUO3 · 2H2O
7.16.4MetaschoepiteUO3 · 1-2H2O
7.16.5MetastudtiteUO4 · 2H2O
7.16.6Studtite[(UO2)(O2)(H2O)2] · H2O
7.16.7IanthiniteU4+(UO2)5O7 · 10H2O
7.16.8CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
7.16.9VandenbrandeiteCu(UO2)(OH)4
7.16.10RoubaultiteCu2(UO2)3(OH)10 · 5H2O
7.16.11BecquereliteCa(UO2)6O4(OH)6 · 8H2O
7.16.12RameauiteK2Ca(UO2)6(OH)16 · H2O
7.16.13AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O
7.16.14ProtasiteBa(UO2)3O3(OH)2 · 3H2O
7.16.15BillietiteBa(UO2)6O4(OH)6 · 4-8H2O
7.16.16BauranoiteBa(UO2)2(OH)6 · 1-2H2O
7.16.17Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
7.16.18Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
7.16.19OrthobranneriteU4+U6+Ti4O12(OH)2
7.16.20Thorutite(Th,U,Ca)Ti2(O,OH)6
7.16.21Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.22Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38
7.16.23Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
7.16.24FourmarieritePb(UO2)4O3(OH)4 · 4H2O
7.16.25RichetitePb(UO2)4O5 · 4H2O
7.16.26CuritePb3(UO2)8O8(OH)6 · 3H2O
7.16.27MasuyitePb(UO2)3O3(OH)2 · 3H2O
7.16.28VandendriesscheitePbU7O22 · 12H2O
7.16.29MetavandendriesscheitePbU7O22 · nH2O n < 12
7.16.30SayritePb2(UO2)5O6(OH)2 · 4H2O
7.16.31Wölsendorfite(Pb,Ca)U2O7 · 2H2O
7.16.32Clarkeite(Na,Ca,Pb)(UO2)O(OH) · 0-1H2O
7.16.33UranosphaeriteBi(UO2)O2(OH)

Other Names for Uraninite

Name in Other Languages:

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 Uraninite

Reference List:
Klaproth, M.H. (1797): Chemische Untersuchung des Uranerzes, Beiträge zur chemischen Kenntniss der Mineralkörper, Zweiter Band, Rottmann Berlin, 197-221

Hillebrand (1893), USGS Bulletin 113: 37.

Goldschmidt and Thomassen (1923), Vidensk. Selsk. Skr. Mat.-nat. Kl.: 2.

Aubel (1927), C.R.: 185: 586.

Parsons (1932), Univ. Toronto Stud., Geol. Ser.: 32: 17.

Ellsworth (1935), American Journal of Science: 9: 127.

Shaub (1938), American Mineralogist: 23: 334.

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: 611-620.

US Geological Survey Bulletin 1064 (1958): 11-47.

Mineralogical Record (1974): 5: 79.

Snetsinger, K.G. and Polkowski, G. (1977) Rare accessory uraninite in a Sierran granite. American Mineralogist: 62: 587-589.

Journal of the American Chemical Society: 70: 99-105.

Finch, R.J. and R.C. Ewing (1992), The corrosion of uraninite under oxidizing conditions. Journal of Nuclear Materials: 190: 133-156.

Pearcy, E.C., Prikryl, J.D., Murphy, W.M., and Leslie, B.W. (1994) Alteration of uraninite from the Nopal I deposit, Peña Blanca District, Chihuahua, Mexico, compared to degradation of spent nuclear fuel in the proposed U.S. high-level nuclear waste repository at Yucca Mountain, Nevada. Appl. Geochem.: : 713-732.

Abdelouas, A., Lutze, W., and Nuttall, H.E. (1999) Oxidative dissolution of uraninite precipitated on Navajo sandstone. Journal Contam. Hydrol.: 36: 353-375.

Fayek, M., Utsunomiya, S., Pfiffner, S.M., White, D.C., Riciputi, L.R., Ewing, R.C., Anovitz, L.M., and Stadermann, F.J. (2005) The application of HRTEM techniques and nanosims to chemically and isotopically characterize Geobacter Sulfurreducens surfaces. Canadian Mineralogist: 43: 1631-1641. (bioprecipitation of uraninite).

J. Plášil (2014): Oxidation–hydration weathering of uraninite: the current state-of-knowledge. Journal of Geosciences 59, 99-114.

Internet Links for Uraninite

Localities for Uraninite

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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: May 30, 2015 15:25:45 Page generated: May 26, 2015 20:57:07