Solongoit
| Solongoit | |
|---|---|
| General and classification | |
| other names |
IMA 1973-017 |
| chemical formula | Ca 2 [Cl | B 3 O 4 (OH) 4 ] |
|
Mineral class (and possibly department) |
Borates (formerly "Carbonates, Nitrates and Borates") |
|
System no. to Strunz and to Dana |
6.CA.40 ( 8th edition : V / H.06) 03/25/02/01 |
| Crystallographic Data | |
| Crystal system | monoclinic |
| Crystal class ; symbol | monoclinic prismatic; 2 / m |
| Space group | P 2 1 / a (No. 14, position 3) |
| Lattice parameters |
a = 12.57 Å ; b = 7.24 Å; c = 7.97 Å β = 86.1 ° |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | 3.5 |
| Density (g / cm 3 ) | measured: 2.514; calculated: 2.58 |
| Cleavage | imperfect |
| colour | colorless to white |
| Line color | White |
| transparency | transparent to translucent |
| shine | Glass gloss |
| Crystal optics | |
| Refractive indices |
n α = 1.510 n β = 1.510 n γ = 1.545 |
| Birefringence | δ = 0.035 |
| Optical character | biaxial positive |
Solongoite is a very rare mineral from the mineral class of " borates " (formerly "carbonates, nitrates and borates"). It crystallizes in the monoclinic crystal system with the chemical composition Ca 2 [Cl | B 3 O 4 (OH) 4 ] and develops mostly tabular and vertically striped crystals up to about 0.2 mm in size.
Solongoit is colorless and transparent and has a glass-like sheen on visible crystal surfaces .
Etymology and history
Was first discovered in 1974 in the Solongoit rock sample of a core sample that from a depth of 400 m of the boron - deposit "Solongo" on the Witimplateau in the Russian Republic Burjatien was taken.
The mineral was analyzed and described by the Russian mineralogist Swetlana Vjatscheslavowna Malinko ( Russian : Светлана Вячеславовна Малинко , 1927–2002), a specialist and discoverer of numerous boron minerals, who named it after its type locality .
classification
In the meanwhile outdated, but still in use 8th edition of the mineral classification according to Strunz , the solongoite still belonged to the common mineral class of "carbonates, nitrates and borates" and there to the department of "group borates", where it together with Inderborit , Inderit , Inyoit , Kurnakovit and Meyerhofferit formed the unnamed group V / H.06 .
The 9th edition of Strunz's mineral systematics, which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), assigns the Solongoite to the now independent class of "borates" and there in the department of "triborates". However, this division is further subdivided according to the crystal structure, so that the mineral can be found according to its structure in the sub-division of the "island triborates (Neso triborates)", where it is the only member of the unnamed group 6.CA.40 .
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Solongoit to the common class of “carbonates, nitrates and borates” and there in the section of “anhydrous borates with hydroxyl or halogen”, like the outdated Strunz system. Here he is the only member of the unnamed group 25.03.02 within the subdivision “ 25.03 Anhydrous borates with hydroxyl or halogen ”.
Education and Locations
Solongoite forms in boron deposits formed by contact metamorphosis . Accompanying minerals include andradite - grossular , calcite , chlorite , hematite , kurchatovite , magnetite , quartz , sphalerite , szaibélyite , svabite and vesuvianite .
In addition to its type locality “Solongo” in Russia, the mineral could so far (as of 2012) only be detected in the “Fuka Mine” near Takahashi on the Japanese island of Honshū.
Crystal structure
Solongoite crystallizes monoclinically in the space group P 2 1 / a (space group no. 14, position 3) with the lattice parameters a = 12.57 Å ; b = 7.24 Å; c = 7.97 Å and β = 86.1 ° as well as 4 formula units per unit cell .
See also
literature
- Michael Fleischer , Robert W. Potter: New mineral names . In: American Mineralogist . tape 60 , 1975, pp. 161–163 (English, rruff.info [PDF; 327 kB ; accessed on May 14, 2019]).
- NA Yamnova, MA Simonov, NV Belov: Refined crystal structure of solongoite Ca 2 [B 3 O 4 (OH) 4 ] Cl . In: Soviet Physics - Crystallography . tape 22 , 1977, pp. 356–357 (English, rruff.info [PDF; 163 kB ; accessed on May 14, 2019]).
Web links
- Mineral Atlas: Solongoit (Wiki)
- American-Mineralogist-Crystal-Structure-Database - Solongoite. In: rruff.geo.arizona.edu. Accessed May 14, 2019 .
Individual evidence
- ↑ Malcolm Back, William D. Birch, Michel Blondieau and others: The New IMA List of Minerals - A Work in Progress - Updated: March 2019. (PDF 1703 kB) In: cnmnc.main.jp. IMA / CNMNC, Marco Pasero, March 2019, accessed May 20, 2019 .
- ↑ a b c d e Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 343 .
- ^ David Barthelmy: Solongoite Mineral Data. In: webmineral.com. Accessed May 14, 2019 .
- ↑ a b c Solongoite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 (English, handbookofmineralogy.org [PDF; 67 kB ; accessed on May 14, 2019]).
- ↑ a b c d e Solongoite. In: mindat.org. Hudson Institute of Mineralogy, accessed May 14, 2019 .
- ^ Svetlana V. Malinko, S. Anic'ic ', D. Joksimovic', AE Lisitsyn, VV Rudnev, GI Dorokhova, NA Yamnova, VV Vlasov, AA Ozol, Nikita V. Chukanov: Jarandolite Ca [B 3 O 4 (OH ) 3 ], calcium borate from Serbia: New name and new data . In: Fersman Mineralogical Museum, Russian Academy of Science (Ed.): New Data on Minerals . tape 39 , 2004, p. 26–31 , (Malinko year of death, see p. 31) (English, available online at fmm.ru [PDF; 226 kB ; accessed on May 14, 2019]).
- ↑ Александр Евсеев ( Alexander Evseev ): Short biography and bibliography on Светлана Вячеславовна Малинко (1927-2002). In: geo.web.ru. Retrieved May 14, 2019 .