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Nyerereite
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Geliefert zwischen Do., 15.01.2026 und Fr., 16.01.2026
Details
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Nyerereite is a very rare sodium calcium carbonate mineral with formula Na2Ca(CO3)2. It forms colorless, platey pseudohexagonal orthorhombic crystals that are typically twinned. It has a specific gravity of 2.54 and indices of refraction of n =1.511, n =1.533 and n =1.535. Nyerereite is not stable in contact with the atmosphere and rapidly breaks down. Collection specimens must be kept in a sealed argon environment.It has a Hermann Mauguin notation of mm2 and the respective space group is Cmc21.In nature Nyerereite is naturally twinned and is pseudohexagonal with triad twinning; meaning that this is a six sided crystal that apparently has a hexagonal shape but is not in the hexagonal system. Triad twinning is the intergrowth of three orthorhombic crystals that turn at their center and form hexagonally shaped crystals. Nyerereite is biaxial negative, and has a 2v of 29 degrees. It shows a center acute bisectrix and a birefringence of approximately 0.023.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786130998059
- Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
- Genre Chemie
- Größe H220mm x B220mm
- EAN 9786130998059
- Format Fachbuch
- Titel Nyerereite
- Herausgeber Betascript Publishing
- Anzahl Seiten 76
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