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Meta-autunite

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Formula:
Ca(UO2)2(PO4)2 · 6-8H2O
System:
Tetragonal
Colour:
greenish yellow, lemon ...
Hardness:
2 - 2½
Name:
Named in 1904 by Paul Gaubert for Meta- and its relationship to autunite.

Classification of Meta-autunite

Approved, 'Grandfathered' (first described prior to 1959)
8.EB.10

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
40.2a.1.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
19.11.14

19 : Phosphates
11 : Phosphates of U
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Type Occurrence of Meta-autunite

Occurrences of Meta-autunite

Geological Setting:
Granite pegmatite, also sedimentary bedded uranium-vanadium deposits

Physical Properties of Meta-autunite

Waxy, Pearly, Dull, Earthy
Diaphaneity (Transparency):
Translucent
Colour:
greenish yellow, lemon yellow
Streak:
pale yellow
Hardness (Mohs):
2 - 2½
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Density:
3.35 - 3.55 g/cm3 (Measured)    3.31 g/cm3 (Calculated)

Crystallography of Meta-autunite

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Cell Parameters:
a = 6.97Å, c = 8.47Å
Ratio:
a:c = 1 : 1.215
Unit Cell Volume:
V 411.48 ų (Calculated from Unit Cell)
Z:
1
Comment:
also orthorhombic Pmmm
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.46 (100)
5.39 (20)
4.233 (20)
3.620 (60)
2.615 (30)
2.115 (35)
1.601 (25)
Comments:
ICDD 39-1351

Optical Data of Meta-autunite

Type:
Uniaxial (-)
RI values:
nα = 1.596 - 1.604 nβ = 1.602 - 1.622 nγ = 1.603 - 1.630 nω = 1.607 nε = 1.584
2V:
Measured: 5° to 20°
Birefringence:
0.015
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
X = colorless to pale yellow
Z = dark yellow

Chemical Properties of Meta-autunite

Formula:
Ca(UO2)2(PO4)2 · 6-8H2O
All elements listed in formula:
Common Impurities:
Ba,Mg

Relationship of Meta-autunite to other Species

Other Members of Group:
AbernathyiteK(UO2)(AsO4) · 3H2O
Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2O
LehneriteMn2+(UO2)2(PO4)2 · 8H2O
Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2O
MetakahleriteFe2+(UO2)2(AsO4)2 · 8H2O
MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2O
MetalodèviteZn(UO2)2(AsO4)2 · 10H2O
MetanováčekiteMg(UO2)2(AsO4)2 · 8H2O
MetatorberniteCu(UO2)2(PO4)2 · 8H2O
Metauranocircite-IBa(UO2)2(PO4)2 · 7H2O
MetauranospiniteCa(UO2)2(AsO4)2 · 8H2O
MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2O
Uramarsite(NH4,H3O)2(UO2)2(AsO4,PO4)2 · 6H2O
Uramphite(NH4)2(UO2)2(PO4)2 · 6H2O
8.EB.05AutuniteCa(UO2)2(PO4)2 · 11H2O
8.EB.05HeinrichiteBa(UO2)2(AsO4)2 · 10H2O
8.EB.05KahleriteFe(UO2)2(AsO4)2 · 12H2O
8.EB.05Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
8.EB.05SaléeiteMg(UO2)2(PO4)2 · 10H2O
8.EB.05TorberniteCu(UO2)2(PO4)2 · 12H2O
8.EB.05UranocirciteBa(UO2)2(PO4)2 · 10H2O
8.EB.05UranospiniteCa(UO2)(AsO4)2 · 10H2O
8.EB.05Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O
8.EB.05ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
8.EB.05MetarauchiteNi(UO2)2(AsO4)2 · 8H2O
8.EB.05RauchiteNi(UO2)2(AsO4)2 · 10H2O
8.EB.10BassetiteFe2+(UO2)2(PO4)2 · 10H2O
8.EB.10LehneriteMn2+(UO2)2(PO4)2 · 8H2O
8.EB.10MetasaléeiteMg(UO2)2(PO4)2 · 8H2O
8.EB.10Metauranocircite-IBa(UO2)2(PO4)2 · 7H2O
8.EB.10MetauranospiniteCa(UO2)2(AsO4)2 · 8H2O
8.EB.10MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2O
8.EB.10MetakahleriteFe2+(UO2)2(AsO4)2 · 8H2O
8.EB.10MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2O
8.EB.10MetanováčekiteMg(UO2)2(AsO4)2 · 8H2O
8.EB.10MetatorberniteCu(UO2)2(PO4)2 · 8H2O
8.EB.10MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
8.EB.10PrzhevalskitePb2(UO2)3(PO4)2(OH)4 · 3H2O
8.EB.10Meta-lodèvite
8.EB.15AbernathyiteK(UO2)(AsO4) · 3H2O
8.EB.15Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2O
8.EB.15Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
8.EB.15Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2O
8.EB.15Trögerite(H3O)(UO2)(AsO4) · 3H2O
8.EB.15Uramphite(NH4)2(UO2)2(PO4)2 · 6H2O
8.EB.15Uramarsite(NH4,H3O)2(UO2)2(AsO4,PO4)2 · 6H2O
8.EB.20ThreadgolditeAl(UO2)2(PO4)2(OH) · 8H2O
8.EB.20ChistyakovaiteAl(UO2)2(AsO4)2(F,OH) · 6.5H2O
8.EB.25ArsenuranospathiteAl[(UO2)(AsO4)]2F(H2O)20
8.EB.25Uranospathite(Al,☐)(UO2)2(PO4)2F · 20(H2O,F)
8.EB.30Vochtenite(Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O
8.EB.35CoconinoiteFe23+Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O
8.EB.40RanunculiteHAl(UO2)(PO4)(OH)3 · 4H2O
8.EB.45TrianguliteAl3(UO2)4(PO4)4(OH)5 · 5H2O
8.EB.50FurongiteAl13(UO2)7(PO4)13(OH)14 · 58H2O
8.EB.55SabugaliteHAl(UO2)4(PO4)4 · 16H2O
19.11.1LermontoviteU(PO4)(OH) · H2O
19.11.2MetavanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 2H2O
19.11.3VanmeersscheiteU6+(UO2)3(PO4)2(OH)6 · 4H2O
19.11.4Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2O
19.11.5VyacheslaviteU(PO4)(OH) · nH2O
19.11.6MetanatroautuniteNa(UO2)(PO4)(H2O)3
19.11.7YingjiangiteK2Ca(UO2)7(PO4)4(OH)6 · 6H2O
19.11.8Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
19.11.9Uramphite(NH4)2(UO2)2(PO4)2 · 6H2O
19.11.10TorberniteCu(UO2)2(PO4)2 · 12H2O
19.11.11MetatorberniteCu(UO2)2(PO4)2 · 8H2O
19.11.12SaléeiteMg(UO2)2(PO4)2 · 10H2O
19.11.13NingyoiteCaU(PO4)2 · 1-2H2O
19.11.15AutuniteCa(UO2)2(PO4)2 · 11H2O
19.11.16Pseudo-autunite(H3O)4Ca2(UO2)2(PO4)4 · 5H2O
19.11.17PhurcaliteCa2(UO2)3(PO4)2O2 · 7H2O
19.11.18Phosphuranylite(H3O)3KCa(UO2)7(PO4)4O4 · 8H2O
19.11.19UlrichiteCaCu(UO2)(PO4)2 · 4H2O
19.11.20BergeniteCa2Ba4(UO2)9(PO4)6O6 · 16H2O
19.11.21Metauranocircite-IBa(UO2)2(PO4)2 · 7H2O
19.11.22UranocirciteBa(UO2)2(PO4)2 · 10H2O
19.11.23RanunculiteHAl(UO2)(PO4)(OH)3 · 4H2O
19.11.24TrianguliteAl3(UO2)4(PO4)4(OH)5 · 5H2O
19.11.25MunditeAl(UO2)3(PO4)2(OH)3 · 5.5H2O
19.11.26UpaliteAl(UO2)3(PO4)2O(OH) · 7H2O
19.11.27FurongiteAl13(UO2)7(PO4)13(OH)14 · 58H2O
19.11.28ThreadgolditeAl(UO2)2(PO4)2(OH) · 8H2O
19.11.29PhuralumiteAl2(UO2)3(PO4)3(OH)2 · 13H2O
19.11.30MoreauiteAl3(UO2)(PO4)3(OH)2 · 13H2O
19.11.31SabugaliteHAl(UO2)4(PO4)4 · 16H2O
19.11.32Uranospathite(Al,☐)(UO2)2(PO4)2F · 20(H2O,F)
19.11.33AlthupiteAlTh(UO2)7(PO4)4(OH)5O2 · 15H2O
19.11.34Françoisite-(Nd)(Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2O
19.11.35Kivuite(Th,Ca,Pb)(UO2)4(HPO4)2(OH)8 · 7H2O
19.11.36ParsonsitePb2(UO2)(PO4)2
19.11.37DewindtiteH2Pb3(UO2)2(PO4)4O4 · 12H2O
19.11.38DumontitePb2(UO2)3(PO4)2(OH)4 · 3H2O
19.11.39PrzhevalskitePb2(UO2)3(PO4)2(OH)4 · 3H2O
19.11.40LehneriteMn2+(UO2)2(PO4)2 · 8H2O
19.11.41BassetiteFe2+(UO2)2(PO4)2 · 10H2O
19.11.42Vochtenite(Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O

Other Names for Meta-autunite

Name in Other Languages:
Simplified Chinese:变钙铀云母
Traditional Chinese:變鈣鈾雲母

Other Information

Fluoresces bright greenish yellow in SW and LW UV
Health Risks:
Contains uranium - 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.

References for Meta-autunite

Reference List:
Gaubert, P. (1904): Produits deshydration de quelque phosphates et orientation du chlorure de baryum sur les mineraux des groups de l'autunite, Bulletin Soc. franc. Min., 27, 212-216.

Beintema, J. (1938): Composition and crystallography of autunite and the meta-autunites. Recueil des Travaux Chimiques des Pays-Bas et de la Belgique 57, 155-175.

Makarov, E.S. and Ivanov, V.I. (1960) The crystal structure of meta-autunite, Ca(UO2)2(PO4)2·6H2O. Doklady of the Academy of Sciences of the USSR: 132: 601-603.

American Mineralogist (1963): 48: 1389-1393.

American Mineralogist (1981): 66: 1068-1072.

Bulletin de la Société française de Minéralogie et de Cristallographie: 81: 4-10.

Doklady Akademii Nauk SSSR: 132: 601-603.

Sowder, A. G.; Clark, S. B.; Fjeld, R. A. (2000): Dehydration of synthetic autunite hydrates. Radiochimica Acta 88, 533-538.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Suzuki, Y., Sato, T., Isobe, H., Kogure, T., Murakami, T. (2005): Dehydration processes in the meta-autunite group minerals meta-autunite, metasaléeite, and metatorbernite. American Mineralogist 90, 1308-1314.

Lazic, B., Kahlenberg, V., Vulic, P., Pesic, L. & Dimitrijevic, R. (2009): Meta-autunite from a Li-pegmatite of the Cer Mt., Serbia: Its mineralogical and XRD investigations. Neues Jahrbuch für Mineralogie - Abhandlungen 186, 333-344.

Internet Links for Meta-autunite

Localities for Meta-autunite

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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