Chemistry:Letovicite
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| Letovicite | |
|---|---|
 White crystals of ammonium sulfate mineral letovicite from the Anna 2 Mine, Aachen, North Rhine – Westphalia, Germany. | |
| General | |
| Category | Sulfate mineral |
| Formula (repeating unit) | (NH4)3H(SO4)2 |
| Strunz classification | 07.AD.20 |
| Dana classification | 28.1.3.1 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) |
| Space group | C2/c (no. 15) |
| Identification | |
| Color | Colorless, white |
| Crystal habit | Tiny pseudo-hexagonal plates, granular |
| Twinning | Lamellar twinning |
| Cleavage | Distinct on {001} |
| Fracture | Uneven |
| Mohs scale hardness | 1–2 |
| Diaphaneity | Transparent |
| Specific gravity | 1.83 |
| Optical properties | Biaxial (−), colorless (transmitted light) |
| 2V angle | 75° (calc.) |
| Solubility | Soluble in water |
| References | [1] |
Letovicite (/lɛtoʊˈvɪsaɪt/) is an ammonium sulfate mineral with composition (NH4)3H(SO4)2 (IUPAC: triammonium sulfate hydrogensulfate, Nickel–Strunz classification 07.AD.20).
It is a rare colorless or white monoclinic secondary mineral formed during the burning of waste coal heaps and as a deposit in hot springs. It was first described from the Letovice region of Moravia in 1932. Geologic occurrences also include Austria, Germany , Hungary, Italy, Poland , South Africa , Tajikistan and the United States .
References
- ↑ Leclaire, A.; Ledésert, M.; Monier, J. C.; Daoud, A.; Damak, M. (1 August 1985). "Structure du disulfate acide de triammonium. Une redétermination. Relations des chaînes de liaisons hydrogène avec la morphologie et la conductivité électrique". Acta Crystallographica Section B: Structural Science 41 (4): 209–213. doi:10.1107/S0108768185002002.
- ↑ 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. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
Bibliography
- Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 397.
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