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Minrecordite

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Minrecordite
General
CategoryCarbonate minerals Dolomite group
Formula
(repeating unit)		CaZn(CO3)2
IMA symbolMrd
Strunz classification5.AB.10
Crystal systemTrigonal
Crystal class3 Rhomboehedral
Identification
ColorWhite, colourless
Crystal habitTypically rhombohedral crystals saddle-shaped, twisted
CleavageVery good on
Mohs scale hardness3.5–4
LusterPearly
StreakWhite
DiaphaneityTranslucent
Specific gravity3.45
References

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. In this locality it is associated primarily with dioptase, and less frequently with duftite, calcite and malachite. 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).

References

  1. 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.
  2. http://rruff.geo.arizona.edu/doclib/hom/minrecordite.pdf Mineral Handbook
  3. https://www.mindat.org/min-2723.html Mindat
  4. http://webmineral.com/data/minrecordite.shtml Webmineral
  5. Garavelli, Carlo G.; Vurro, Filippo; Fioravanti, Gian Carlo (1982). "Minrecordite, a new mineral from Tsumeb". The Mineralogical Record. 13: 131–136.
  6. "Minrecordite". Mindat. Retrieved 4 September 2019.
  7. 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.

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