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Nyerereite: a new volcanic carbonate mineral from Oldoinyo Lengai, Tanzania

Published/Copyright: July 28, 2010
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Zeitschrift für Kristallographie
From the journal Zeitschrift für Kristallographie Volume 145 Issue 1-2

Abstract

Nyerereite has the idealized composition (Na0.82K0.18)2Ca(CO3)2 with significant minor substitution of SO42−, PO43−, F− for CO32−, optical properties α = 1.5112, β = 1.5333, γ = 1.5345, 2 Vα = 29°, and density 2.541 g cm−3. The average unit cell has space group Cmc21, dimensions a = 5.044, b = 8.809, c = 12.743 Å and contains four formula units. Non-Bragg reflexions have h = n + mδ where n and m are integers and δ = 0.383 and indicate a structural modulation. The natural mineral is an inversion product from a high-temperature hexagonal polymorph, high nyerereite with a = 5.05, c = l2.85 Å and space group P63mc. The average structure of the natural mineral (low nyerereite) is discussed and the structure of high nyerereite is inferred. The high-nyerereite structure is the aristotype for all phases except buetschliite in the system Na2Ca(CO3)2–K2Ca(CO3)2. Mineralogical nomenclature in this system is discussed.

Published Online: 2010-07-28
Published in Print: 1977

Articles in the same Issue

  1. Zeitschrift für Kristallographie 1877–1977
  2. The Zeitschrift für Kristallographie and Professor Dr. G. Menzer
  3. Die Molekular- und Kristallstruktur von N,N′-Disalicyliden-meso-1,2-diphenyläthylendiamin*
  4. Quadratischer elektrooptischer Tensor des rhombischen Calciumformiats
  5. Die Kristallstruktur von Cu2As3O6CH3COO
  6. Die Bestimmung der Kristallstruktur von Trimerit CaMn2(BeSiO4)3 und das Trimeritgesetz der Verzwillingung
  7. Powder data for the chlorine derivatives of C.I. Pigment Red 9 and C.I. Pigment Brown 1
  8. Nyerereite: a new volcanic carbonate mineral from Oldoinyo Lengai, Tanzania
  9. The magnetic structures of NiWO4 and CoWO4
  10. A study of the structural chemistry of coesite
  11. Crystal structure of a synthetic, compositionally intermediate, hypersolvus alkali feldspar: evidence for Na, K site ordering
  12. Twinning and disorder in zinc perchlorate hexahydrate crystals
  13. Crystal data for the polymethine dye 1,3-bis (dimethylamino)-trimethinium perchlorate
  14. Unit-cell dimensions of Hofmann pyridine complexes
https://doi.org/10.1524/zkri.1977.145.1-2.73

Articles in the same Issue

  1. Zeitschrift für Kristallographie 1877–1977
  2. The Zeitschrift für Kristallographie and Professor Dr. G. Menzer
  3. Die Molekular- und Kristallstruktur von N,N′-Disalicyliden-meso-1,2-diphenyläthylendiamin*
  4. Quadratischer elektrooptischer Tensor des rhombischen Calciumformiats
  5. Die Kristallstruktur von Cu2As3O6CH3COO
  6. Die Bestimmung der Kristallstruktur von Trimerit CaMn2(BeSiO4)3 und das Trimeritgesetz der Verzwillingung
  7. Powder data for the chlorine derivatives of C.I. Pigment Red 9 and C.I. Pigment Brown 1
  8. Nyerereite: a new volcanic carbonate mineral from Oldoinyo Lengai, Tanzania
  9. The magnetic structures of NiWO4 and CoWO4
  10. A study of the structural chemistry of coesite
  11. Crystal structure of a synthetic, compositionally intermediate, hypersolvus alkali feldspar: evidence for Na, K site ordering
  12. Twinning and disorder in zinc perchlorate hexahydrate crystals
  13. Crystal data for the polymethine dye 1,3-bis (dimethylamino)-trimethinium perchlorate
  14. Unit-cell dimensions of Hofmann pyridine complexes
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