Kyawthuite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Kyawthuite
Formula:
Bi3+Sb5+O4
Colour:
Reddish orange
Lustre:
Adamantine
Hardness:
5½
Specific Gravity:
8.256
Crystal System:
Monoclinic
Name:
Named for Dr. Kyaw Thu (b. 1973), a Burmese mineralogist-petrologist-gemologist with a Ph.D. from Yangon University (2007). He was on the staff of the Geology Department of Yangon University from 1998 to 2005 and has been the owner/operator of the Macle Gem Trade Laboratory since 2003.
Type Locality:
Isostructural with:
Well-known as a synthetic compound. The only approved Bi-Sb oxide mineral. May be a chemical analogue of clinobisvanite, BiVO4, but the space groups are slightly different. Not analogous to bismutocolumbite or bismutotantalite.
Crystal structure details: (1) Sb5+O6 octahedra; (2) the octahedra share corners to form checkerboard-like sheets || {001}; (3) Bi3+ ions above and below the open-square areas within the sheets; (4) these Bi cations bond with O atoms in the sheets providing a link for adjacent sheets; (5) Bi has lopsided 8 coordination.
Crystal structure details: (1) Sb5+O6 octahedra; (2) the octahedra share corners to form checkerboard-like sheets || {001}; (3) Bi3+ ions above and below the open-square areas within the sheets; (4) these Bi cations bond with O atoms in the sheets providing a link for adjacent sheets; (5) Bi has lopsided 8 coordination.
Unique Identifiers
Mindat ID:
46909
Long-form identifier:
mindat:1:1:46909:6
IMA Classification of Kyawthuite
Approved
Approval year:
2015
First published:
2017
Classification of Kyawthuite
4.DE.45
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
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 |
|---|---|---|
| Kyw | 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 Kyawthuite
Adamantine
Transparency:
Transparent
Colour:
Reddish orange
Streak:
White
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}; also good on {110} and {110}
{001}; also good on {110} and {110}
Fracture:
Conchoidal
Density:
8.256(5) g/cm3 (Measured) 8.127 g/cm3 (Calculated)
Chemistry of Kyawthuite
Mindat Formula:
Bi3+Sb5+O4
Element Weights:
Elements listed:
Crystallography of Kyawthuite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 5.4624(4) Å, b = 4.8852(2) Å, c = 11.8520(8) Å
β = 101.195(7)°
β = 101.195(7)°
Ratio:
a:b:c = 1.118 : 1 : 2.426
Unit Cell V:
310.25 ų
Z:
4
Comment:
I2/c
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.266 Å | (100) |
| 2.900 Å | (66) |
| 2.678 Å | (24) |
| 2.437 Å | (22) |
| 1.866 Å | (21) |
| 1.803 Å | (43) |
| 1.626 Å | (23) |
| 1.529 Å | (28) |
Locality:
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Kyawthuite
General Appearance of Type Material:
Single crystal faceted into a 1.61-carat gem
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue number 65602
Geological Setting of Type Material:
Found in a waterworn crystal in alluvium at Chaung-gyi-ah-le-ywa; likely originated from a pegmatite
Synonyms of Kyawthuite
Other Language Names for Kyawthuite
Dutch:Kyawthuiet
German:Kyawthuit
Related Minerals - Strunz-mindat Grouping
| 4.DE. | Colchesterite | Bi3+2Mo6+2O9 |
| 4.DE. | Pertoldite | GeO2 |
| 4.DE. | Ziroite | ZrO2 |
| 4.DE.05 | Downeyite | SeO2 |
| 4.DE.10 | Koragoite | (Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20 |
| 4.DE.15 | Russellite | Bi2WO6 |
| 4.DE.15 | Koechlinite | Bi2MoO6 |
| 4.DE.15 | Tungstibite | Sb3+2WO6 |
| 4.DE.20 | Tellurite | TeO2 |
| 4.DE.25 | Paratellurite | TeO2 |
| 4.DE.30 | Bismutotantalite | BiTaO4 |
| 4.DE.30 | Stibiotantalite | Sb3+TaO4 |
| 4.DE.30 | Cervantite | Sb3+Sb5+O4 |
| 4.DE.30 | Bismutocolumbite | BiNbO4 |
| 4.DE.30 | Stibiocolumbite | SbNbO4 |
| 4.DE.30 | Clinocervantite | Sb3+Sb5+O4 |
| 4.DE.35 | Baddeleyite | ZrO2 |
| 4.DE.40 | Billwiseite | Sb3+5Nb3WO18 |
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.
Internet Links for Kyawthuite
mindat.org URL:
https://www.mindat.org/min-46909.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Kyawthuite
Reference List:
Kennedy, Brendan J. (1994) X-ray powder diffraction study of BiSbO4. Powder Diffraction, 9 (3). 164-167 doi:10.1017/s0885715600019151
Enjalbert, Renée, Sorokina, Svetlana, Castro, Alicia, Galy, Jean (1995) Comparison of Bismuth Stereochemistry in [BiO2]n and [Bi2O2]n Layers. Refinement of BiSbO4. Acta Chemica Scandinavica, 49. 813-819 doi:10.3891/acta.chem.scand.49-0813
Localities for Kyawthuite
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Myanmar (TL) | |
| Kampf et al. (2017) |
Quick NavTopAbout KyawthuiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Chaung-gyi-ah-le-ywa, Chaung-gyi, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar