Chemistry:Dundasite
| Dundasite | |
|---|---|
 Dundasite (the white mineral) and crocoite from Dundas, Tasmania. Field of view is 5mm. | |
| General | |
| Category | Carbonate mineral |
| Formula (repeating unit) | PbAl2[(OH)2|CO3]2 • H2O |
| Strunz classification | 5.DB.10 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pbmm (no. 51) |
| Unit cell | a = 9.08, b = 16.37 c = 5.62 [Å]; Z = 4 |
| Identification | |
| Color | White to very pale blue; colorless in transmitted light |
| Crystal habit | Acicular crystals typically in spherical aggregates and matted crusts |
| Cleavage | Perfect On {010} |
| Mohs scale hardness | 2 |
| |re|er}} | Vitreous to silky |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 3.10 – 3.55 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.603 nβ = 1.716 nγ = 1.750 |
| Birefringence | δ = 0.147 |
| 2V angle | Measured: 30° to 40°, calculated: 54° |
| References | [1][2][3] |
Dundasite is a rare lead aluminium carbonate mineral. The mineral is named after the type locality, Dundas, Tasmania, Australia .[1] The mineral was first discovered in the Adelaide Proprietary Mine.[5] Dundasite was first described by William Frederick Petterd in 1893.[6]
Dundasite is an uncommon secondary mineral occurring in the oxidized zone of lead ore deposits.[2] It commonly overgrows crocoite. It may also be overgrown by yellow cerussite.[5] It may be associated with cerussite, plattnerite, azurite, malachite, pyromorphite, mimetite, beudantite, duftite, crocoite, gibbsite, allophane and limonite.[2]
Besides its type location on Tasmania, the mineral has also been found in New Zealand, Mainland Australia , China, Belgium, Germany , France , Greece, United Kingdom , Ireland, Italy, Austria, Czech Republic, Namibia, and the US.[1]
References
- ↑ 1.0 1.1 1.2 "Dundasite mineral information and data". mindat.org. http://www.mindat.org/min-1330.html.
- ↑ 2.0 2.1 2.2 "Handbook of Mineralogy: Dunasite". RRUF Database. http://rruff.geo.arizona.edu/doclib/hom/dundasite.pdf.
- ↑ "Dundasite Mineral Data". Webmineral. http://www.webmineral.com/data/Dundasite.shtml.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ 5.0 5.1 Bottrill, Ralph (April 12, 2009). "Dundasite". http://www.mindat.org/forum.php?read,70,134092,134295. Retrieved 2009-10-16.
- ↑ "Volume 14". The Mineralogical Magazine and Journal of the Mineralogical Society (Great Britain: Mineralogical Society). 1965.
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