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Metazeunerite

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Formula:
Cu(UO2)2(AsO4)2 · 8H2O
System:
Tetragonal
Colour:
Grass-green, ...
Hardness:
2 - 2½
Name:
Named in 1937 by Aleksandr Evgenievich Fersman and Olga Mikhailovna Shubnikova for "Meta" for a lower hydration state and it relationship to Zeunerite.
Meta-autunite Group.

A rare secondary mineral in the oxidized zones of arsenic-bearing hydrothermal uranium deposits. Commonly originates due to dehydration of zeunerite.

Classification of Metazeunerite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8.EB.10

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
40.2a.14.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
20.7.4

20 : Arsenates (also arsenates with phosphate, but without other anions)
7 : Arsenates of U
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First Recorded Occurrence of Metazeunerite

Place of Conservation of First Recorded Material:
State Museum of Mineralogy and Geology, Dresden, Germany. Mining Academy, Freiberg, Germany: #21730.
Year of Discovery:
1937

Occurrences of Metazeunerite

Geological Setting:
Oxidized zones of arsenic-bearing hydrothermal uranium deposits.

Physical Properties of Metazeunerite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Lustre pearly on {001}.
Colour:
Grass-green, emerald-green; green in transmitted light
Streak:
greenish white
Hardness (Mohs):
2 - 2½
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, perfect; on {010}, distinct.
Fracture:
Irregular/Uneven
Density:
3.64 g/cm3 (Measured)    3.87 g/cm3 (Calculated)

Crystallography of Metazeunerite

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
P42/n
Cell Parameters:
a = 7.1094Å, c = 17.416Å
Ratio:
a:c = 1 : 2.45
Unit Cell Volume:
V 880.3 ų
Z:
2
Morphology:
Crystals rectangular, tabular on {001}, with {010}, or dipyramidal, terminated by {001}. Forms other than {001} commonly rough and striated horizontally. Commonly as foliated or micaceous aggregates.
Twinning:
Merohedrally twinned.
Comment:
Possesses 4/m 2/m 2/m pseudosymmetry.

Epitaxial Relationships of Metazeunerite

Epitaxial Minerals:
UranospiniteCa(UO2)(AsO4)2 · 10H2O
Trögerite(UO2)3(AsO4)2 · 12H2O (?)
Epitaxi Comments:
Oriented growths of metazeunerite on trögerite and uranospinite, with parallel axes.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.86 (10)
5.57 (8)
5.10 (6)
3.73 (10)
3.57 (7)
3.30 (8)
1.561 (6)

Optical Data of Metazeunerite

Type:
Uniaxial (-)
RI values:
nω = 1.643 - 1.651 nε = 1.623 - 1.635
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
Weakly dichroic in transmitted light.
O = Green
E = Pale green, bluish, colourless
Comments:
Indices of refraction vary continuously with the content of zeolitic water within the limits of the phase.

Chemical Properties of Metazeunerite

Formula:
Cu(UO2)2(AsO4)2 · 8H2O
Essential elements:
All elements listed in formula:

Relationship of Metazeunerite to other Species

Series:
Forms a series with Metatorbernite (see here)
Other Members of Group:
AbernathyiteK2(UO2)2(AsO4)2 · 6H2O
BassetiteFe2+(UO2)2(PO4)2 · 8H2O
Chernikovite(H3O)2(UO2)2(PO4)2 · 6H2O
LehneriteMn2+(UO2)2(PO4)2 · 8H2O
Meta-ankoleiteK2(UO2)2(PO4)2 · 6H2O
Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
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 · 4-8H2O
MetatorberniteCu(UO2)2(PO4)2 · 8H2O
Metauranocircite-IBa(UO2)2(PO4)2 · 7H2O
MetauranospiniteCa(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 · 8H2O
8.EB.10LehneriteMn2+(UO2)2(PO4)2 · 8H2O
8.EB.10Meta-autuniteCa(UO2)2(PO4)2 · 6-8H2O
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 · 4-8H2O
8.EB.10MetatorberniteCu(UO2)2(PO4)2 · 8H2O
8.EB.10PrzhevalskitePb2(UO2)3(PO4)2(OH)4 · 3H2O
8.EB.10Meta-lodèvite
8.EB.15AbernathyiteK2(UO2)2(AsO4)2 · 6H2O
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(UO2)3(AsO4)2 · 12H2O (?)
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.25ArsenuranospathiteHAl(UO2)4(AsO4)4 · 40H2O
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
20.7.1Trögerite(UO2)3(AsO4)2 · 12H2O (?)
20.7.2Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2O
20.7.3AbernathyiteK2(UO2)2(AsO4)2 · 6H2O
20.7.5ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
20.7.6MetanováčekiteMg(UO2)2(AsO4)2 · 4-8H2O
20.7.7Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
20.7.8ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2O
20.7.9MetauranospiniteCa(UO2)2(AsO4)2 · 8H2O
20.7.10UranospiniteCa(UO2)(AsO4)2 · 10H2O
20.7.11MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2O
20.7.12HeinrichiteBa(UO2)2(AsO4)2 · 10H2O
20.7.13MetalodèviteZn(UO2)2(AsO4)2 · 10H2O
20.7.14ArsenuranospathiteHAl(UO2)4(AsO4)4 · 40H2O
20.7.15HallimonditePb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
20.7.16HügelitePb2(UO2)3(AsO4)2O2 · 5H2O
20.7.17AsselbornitePb(BiO)3(UO2)4(AsO4)2(OH)7·4H2O
20.7.18MetakahleriteFe2+(UO2)2(AsO4)2 · 8H2O
20.7.19KahleriteFe(UO2)2(AsO4)2 · 12H2O
20.7.20MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2O

Other Names for Metazeunerite

Other Information

Pale yellow-green (LWUV & SW UV).
Other Information:
Radioactive. Readily soluble in acids.
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 Metazeunerite

Reference List:
Schrauf (1872) Mineralogische und petrographische Mitteilungen, Vienna: 2: 181.

Weisbach (1872) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 207 (as Zeunerit).

Weisbach (1873) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 315 (as Zeunerit).

Weisbach (1877) Berg.- und hüttenmännisches Jahrbuch, Vienna: 42: 53.

Goldschmidt (1899) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 31: 468.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 151, 158.

Ježek (1922) Rozpr. České Ak.: 31: Cl. 2, no. 15 (on Torbernite ?).

Goldschmidt, V. (1923) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 9: 106.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 993-994.

Weiss-Frondel (1951) American Mineralogist: 36: 249.

American Mineralogist (1951): 36: 252-255, 411-414.

American Mineralogist (1957): 42: 222-230.

Frondel, C. (1958) Systematic mineralogy of uranium and thorium. U.S. Geol. Sur. Bull. 1064, 215–220.

Ross, M., H.T. Evans, Jr., and D.E. Appleman (1964) Studies of the torbernite minerals (II): the crystal structure of meta-torbernite. American Mineralogist (1964): 49: 1603-1621.

Walenta, K. (1964) Beitr¨age zur Kenntnis
seltener Arsenatmineralien unter besonderer Ber¨ucksichtigung von Vorkommen des Schwarzwaldes. 2. Folge. Tschermaks, Mineralogische und Petrographische Mitteilungen: 9, 109–174 (in German).

de Abeledo, M.E.J., E.E. Galloni, and M.A.R. de Benyacar (1968) Electron diffraction data for some members of the
metatorbernite group. American Mineralogist: 53: 1028–1033.

Locock, A. J. & Burns, P. C. (2003): Crystal structures and synthesis of the copper-dominant members of the autunite and meta-autunite groups: torbernite, zeunerite, metatorbernite and metazeunerite. Canadian Mineralogist: 41: 489-502.

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

Internet Links for Metazeunerite

Localities for Metazeunerite

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