Quetzalcoatlite is a rare tellurium oxysalt mineral with the formula Zn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y. It also contains large amounts of silver- and lead(II)chloride with the formula AgxPbyClx+2y (x+y≤2).[2] It has a Mohs hardness of 3 and it crystallizes in the trigonal system. It has a deep blue color. It was named after Quetzalcoatl, the Aztec and Toltec god of the sea, alluding to its color.[3][4][5] It is not to be confused with tlalocite, which has a similar color and habit.
| Quetzalcoatlite | |
|---|---|
 Blue quetzalcoatlite on quartz from the Bambollita Mine (Oriental Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Picture width 2 mm. | |
| General | |
| Category | Oxide mineral |
| Formula (repeating unit) | Zn6Cu3(TeO6)2(OH)6·AgxPbyClx+2y |
| IMA symbol | Pzl[1] |
| Strunz classification | 4.FE.45 |
| Dana classification | 34.6.3.1 |
| Crystal system | Trigonal |
| Crystal class | Hexagonal scalenohedral (3m) H-M symbol: (3 2/m) |
| Space group | P3m1 |
| Identification | |
| Color | Blue, green in transmitted light |
| Crystal habit | needle-like hexagonal crystals, crystalline crusts, sprays |
| Cleavage | Fair on {1010} |
| Fracture | Brittle |
| Tenacity | Brittle |
| Mohs scale hardness | 3 |
| Luster | Pearly, dull |
| Streak | Pale blue, almost white |
| Diaphaneity | Transparent |
| Specific gravity | 6.05 (measured) |
| Optical properties | Uniaxial (−) |
| Birefringence | δ = 0.062 |
| Pleochroism | blue-green |
| Ultraviolet fluorescence | None |
| Solubility | Insoluble in water, soluble in cold HCl and cold HNO3. Decomposes in KOH when heated |
| References | [1][2][3][4][5] |
Occurrence edit
Quetzalcoatlite was first identified in the Bambollita mine (La Oriental), Moctezuma, Municipio de Moctezuma, Sonora, Mexico. It was later also found in another nearby mine, the Moctezuma mine, and it has also been found in mines in Arizona, Utah and California.[3] It occurs as a rare mineral in the oxidized zone of tellurium-bearing hydrothermal deposits and it is often associated with hessite, galena, bornite, cerussite, azurite, chlorargyrite, teineite, quartz, baryte, khinite, dugganite, and gold.[6]
References edit
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Peter C. Burns; Joseph J. Pluth; Joseph V. Smith; Peter Eng; Ian Steele; Robert M. Housley (2000). "Quetzalcoatlite: A new octahedral-tetrahedral structure from a 2 × 2 × 40 µm3 crystal at the Advanced Photon Source-GSE-CARS Facility" (PDF). American Mineralogist. 85.
- ^ a b "Quetzalcoatlite: Quetzalcoatlite mineral information and data". www.mindat.org. Retrieved 2016-09-20.
- ^ Barthelmy, Dave. "Quetzalcoatlite Mineral Data". webmineral.com. Retrieved 2016-09-20.
- ^ Williams, Sidney A. (1973). "Quetzalcoatlite, Cu4Zn8(TeO3)3(OH)18, a new mineral from Moctezuma, Sonora" (PDF). Mineralogical Magazine. 39 (303): 261–263. Bibcode:1973MinM...39..261W. doi:10.1180/minmag.1973.039.303.01. S2CID 140683781. Retrieved 2016-09-20.
- ^ "Handbook of mineralogy" (PDF). Retrieved 2016-09-20.
External links edit
