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Wumuite
A valid IMA mineral species
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About Wumuite
Formula:
K(W2.67Al0.33)O9
Colour:
Light green
Lustre:
Adamantine, Vitreous
Hardness:
5 - 6
Specific Gravity:
6.52 (Calculated)
Crystal System:
Hexagonal
Name:
Named after the Wumu River, China near the type locality.
Type Locality:
Isostructural with:
Known synthetic analogue.
Unique Identifiers
Mindat ID:
52992
Long-form identifier:
mindat:1:1:52992:7
IMA Classification of Wumuite
Approved
IMA Formula:
KAl0.33W6+2.67O9
Approval year:
2018
First published:
2020
Classification of Wumuite
4.DM.60
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
M : With large (+- medium-sized) cations; unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
M : With large (+- medium-sized) cations; unclassified
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Wum | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Wumuite
Adamantine, Vitreous
Transparency:
Transparent
Colour:
Light green
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Parallel to {1010} and {0001}.
Parallel to {1010} and {0001}.
Density:
6.52 g/cm3 (Calculated)
Optical Data of Wumuite
Type:
Uniaxial (+)
Comments:
The Gladstone–Dale relationship and the chemical constituent predict an average refraction index of 2.13.
Chemistry of Wumuite
Mindat Formula:
K(W2.67Al0.33)O9
Element Weights:
Elements listed:
Crystallography of Wumuite
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mmm
Setting:
P6/mmm
Cell Parameters:
a = 7.2952(5) Å, c = 3.7711(3) Å
Ratio:
a:c = 1 : 0.517
Unit Cell V:
173.81 ų
Z:
1
Morphology:
Tabular. Major {0001}, with minor {1010}, {0110}, and {1100}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.261 Å | (36) |
| 3.727 Å | (30) |
| 2.610 Å | (10) |
| 3.161 Å | (100) |
| 2.413 Å | (40) |
| 1.881 Å | (10) |
| 1.820 Å | (15) |
| 1.577 Å | (15) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Wumuite
General Appearance of Type Material:
light green hexagonal tabular crystals up to 0.3 mm in diameter
Place of Conservation of Type Material:
Geological Museum of China, 15 Xisi Mutton Alley, Beijing, China, registration No. M13782 (holotype), and the Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, China, catalogue No.NY-6-2Z (cotype)
Geological Setting of Type Material:
Lightly-weathered biotite–quartz monzonite (heavy mineral concentrates)
Associated Minerals at Type Locality:
Synonyms of Wumuite
Other Language Names for Wumuite
Related Minerals - Strunz-mindat Grouping
| 4.DM. | Sugarwhiteite | Pb2Te5O12 |
| 4.DM. | Zuolinite | Ba2Sr(Nb4.5Fe3+0.5)O15 |
| 4.DM. | Bahariyaite | KMnO4 |
| 4.DM.05 | Rankamaite | (Na,K)3(Ta,Nb,Al)11(O,OH)31 |
| 4.DM.05 | Sosedkoite | (K,Na)5Al2(Ta,Nb)22O60 |
| 4.DM.15 | Cesplumtantite | (Cs,Na)2(Pb,Sb3+)3Ta8O24 |
| 4.DM.20 | Eyselite | Fe3+Ge4+3O7(OH) |
| 4.DM.25 | Konzettite | CaMn4+Te6+O6 |
| 4.DM.25 |
Nanyang, Huaping County, Lijiang, Yunnan, China