Minrecordite, CaZn(CO3)2, is a very rare mineral belonging to the dolomite group, the member with Ca and Zn. It was discovered, associated with dioptase, in a specimen from the Tsumeb mine (Namibia), which is consequently its type locality. Its name is a tribute to The Mineralogical Record magazine, representing the collaboration between professional and amateur mineralogists.[5] In this locality it is associated primarily with dioptase, and less frequently with duftite, calcite and malachite.[6] It is a rare mineral, which has been found only in a few deposits in the world. In addition to the type locality, it appears in the Preguiça mine, in Moura, district of Beja (Portugal).[7]
| Minrecordite | |
|---|---|
 | |
| General | |
| Category | Carbonate minerals Dolomite group |
| Formula (repeating unit) | CaZn(CO3)2 |
| IMA symbol | Mrd[1] |
| Strunz classification | 5.AB.10 |
| Crystal system | Trigonal |
| Crystal class | 3 Rhomboehedral |
| Identification | |
| Color | White, colourless |
| Crystal habit | Typically rhombohedral crystals saddle-shaped, twisted |
| Cleavage | Very good on [10-14] |
| Mohs scale hardness | 3.5–4 |
| Luster | Pearly |
| Streak | White |
| Diaphaneity | Translucent |
| Specific gravity | 3.45 |
| References | [2][3][4] |
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.
- ^ http://rruff.geo.arizona.edu/doclib/hom/minrecordite.pdf Mineral Handbook
- ^ https://www.mindat.org/min-2723.html Mindat
- ^ http://webmineral.com/data/minrecordite.shtml Webmineral
- ^ Garavelli, Carlo G.; Vurro, Filippo; Fioravanti, Gian Carlo (1982). "Minrecordite, a new mineral from Tsumeb". The Mineralogical Record. 13: 131–136.
- ^ "Minrecordite". Mindat. Retrieved 4 September 2019.
- ^ Pimentel, R.; Nunes, R. & De Ascenção, R. (2007). "Les minéraux d'altération de plomb (Pb) et zinc (Zn) du massif de Preguiça, Moura, Portugal". Le Regne Mineral. 75: 19–26.