Kampf, Anthony R., Rossman, George R., Ma, Chi, Williams, Peter A. (2017) Kyawthuite, Bi3+Sb5+O4, a new gem mineral from Mogok, Burma (Myanmar). Mineralogical Magazine, 81 (3). 477-484 doi:10.1180/minmag.2016.080.102
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Kyawthuite, Bi3+Sb5+O4, a new gem mineral from Mogok, Burma (Myanmar) | ||
| Journal | Mineralogical Magazine | ||
| Authors | Kampf, Anthony R. | Author | |
| Rossman, George R. | Author | ||
| Ma, Chi | Author | ||
| Williams, Peter A. | Author | ||
| Year | 2017 (June) | Volume | 81 |
| Page(s) | 477-484 | Issue | 3 |
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2016.080.102Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 244889 | Long-form Identifier | mindat:1:5:244889:7 |
| GUID | 0 | ||
| Full Reference | Kampf, Anthony R., Rossman, George R., Ma, Chi, Williams, Peter A. (2017) Kyawthuite, Bi3+Sb5+O4, a new gem mineral from Mogok, Burma (Myanmar). Mineralogical Magazine, 81 (3). 477-484 doi:10.1180/minmag.2016.080.102 | ||
| Plain Text | Kampf, Anthony R., Rossman, George R., Ma, Chi, Williams, Peter A. (2017) Kyawthuite, Bi3+Sb5+O4, a new gem mineral from Mogok, Burma (Myanmar). Mineralogical Magazine, 81 (3). 477-484 doi:10.1180/minmag.2016.080.102 | ||
| Abstract/Notes | AbstractKyawthuite, Bi3+Sb5+O4, is a new gem mineral found as a waterworn crystal in alluvium at Chaung-gyi-ah-le-ywa in the Chaung-gyi valley, near Mogok, Burma (Myanmar). Its description is based upon a single sample, which was faceted into a 1.61-carat gem.The composition suggests that the mineral formed in a pegmatite. Kyawthuite is monoclinic, space group I2/c, with unit cell dimensions a = 5.4624(4), b = 4.88519(17), c = 11.8520(8) Å, β = 101.195(7)°, V = 310.25(3) Å3and Z = 4. The colour is reddish orange and the streak is white. It is transparent with adamantine lustre. The Mohs hardness is 5½. Kyawthuite is brittle with a conchoidal fracture and three cleavages: {001} perfect, {110} and {110} good. The measured density is 8.256(5) g cm–3and the calculated density is 8.127 g cm–3. The mineral is optically biaxial with 2V = 90(2)°. The predicted indices of refraction are α = 2.194, β = 2.268, γ = 2.350. Pleochroism is imperceptible and the optical orientation is X = b; Y≈ c; Z ≈ a. Electron microprobe analyses, provided the empirical formula (Bi0.823+Sb0.183+)∑1.00(Sb0.995+Ta0.015+)∑1.00O4. The Raman spectrumis similar to that of synthetic Bi3+Sb5+O4. The infrared spectrum shows a trace amount of OH/H2O. The eight strongest powder X-ray diffraction lines are [dobs in Å(I)(hkl)]: 3.266(100)(112), 2.900(66)(112), 2.678(24)(200), 2.437(22)(020,114), 1.8663(21)(024), 1.8026(43)(116,220,204), 1.6264(23)(224,116) and 1.5288(28)(312,132). In the crystal structure of kyawthuite (R1 = 0.0269 for 593 reflections with Fo > 4σF), Sb5+O6 octahedrashare corners to form chequerboard-like sheets parallel to {001}. Atoms of Bi3+, located above and below the open squares in the sheets, form bonds to the O atoms in the sheets, thereby linking adjacent sheets into a framework. The Bi3+ atom is in lopsided 8 coordination,typical of a cation with stereoactive lone electron pairs. Kyawthuite is isostructural with synthetic β-Sb2O4 and clinocervantite (natural β-Sb2O4). | ||
Map of Localities
Locality Pages
| Locality | Citation Details |
|---|---|
| Chaung-gyi-ah-le-ywa, Chaung-gyi, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar |
Mineral Pages
| Mineral | Citation Details |
|---|---|
| Kyawthuite |
Mineral Occurrences
| Locality | Mineral(s) |
|---|---|
| Chaung-gyi-ah-le-ywa, Chaung-gyi, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar | ⓘ Kyawthuite |
See Also
These are possibly similar items as determined by title/reference text matching only.
