Biringuccite
| Biringuccite | |
|---|---|
| General and classification | |
| other names |
Hoeferit |
| chemical formula | Na 2 [B 5 O 8 (OH)] • H 2 O |
|
Mineral class (and possibly department) |
Borates (formerly carbonates, nitrates and borates) |
|
System no. to Strunz and to Dana |
6.EC.05 ( 8th edition : V / K.03) 05/26/07/01 |
| Crystallographic Data | |
| Crystal system | monoclinic |
| Crystal class ; symbol | monoclinic prismatic; 2 / m |
| Space group | P 2 1 / c (No. 14) |
| Lattice parameters |
a = 11.20 Å ; b = 6.56 Å; c = 20.76 Å β = 93.9 ° |
| Formula units | Z = 8 |
| Physical Properties | |
| Mohs hardness | not defined |
| Density (g / cm 3 ) | measured: 2.32 (synthetic); calculated: 2.297 |
| Cleavage | good according to [001] and [100] |
| Break ; Tenacity | not defined |
| colour | white, light yellow |
| Line color | White |
| transparency | transparent |
| shine | not defined |
| Crystal optics | |
| Refractive indices |
n α = 1.496 n β = 1.539 n γ = 1.557 |
| Birefringence | δ = 0.061 |
| Optical character | biaxial negative |
| Axis angle | 2V = 62 ° (measured); 64 ° (calculated) |
| Other properties | |
| Chemical behavior | water soluble |
Biringuccite is an extremely rare mineral from the mineral class of " borates " (formerly carbonates, nitrates and borates, see classification ). It crystallizes in the monoclinic crystal system with the composition Na 2 [B 5 O 8 (OH)] · H 2 O, so it is chemically a water-containing sodium borate.
So far, biringuccite could only be discovered in the form of tiny, lamellar to needle-like crystals with a hexagonal cross-section and earthy masses of white to light yellow in color.
Etymology and history
Biringuccite was first discovered near Larderello in the central Italian region of Tuscany and described in 1961 by Curzio Cipriani and Piero Vannuccini , who named the mineral after the Italian alchemist, metallurgist and politician Vannoccio Biringuccio (also Vannoccio Vincenzio Austino Luca Biringucci ).
Originally the mineral was named Hoeferit (also Höferit ) by Cipriani and Vannuccini in honor of the chemist Uberto Francesco Hoefer , who was able to detect boric acid in the condensates of the steam fountains ( Soffioni ) pouring out at Larderello . In order to avoid confusion with the mineral hoeferite (more correct Höferite ) described by Friedrich Katzer , Cipriani and Vannuccini renamed their mineral to biringuccite. Höferite later turned out to be a variety of nontronite .
classification
In the meanwhile outdated, but still in use 8th edition of the mineral classification according to Strunz , the biringuccite belonged to the common mineral class of "carbonates, nitrates and borates" and there to the department of "layer borates with complex assemblies [B x (O, OH) y ]" , where together with Nasinit and Tuzlait he formed the unnamed group V / K.03 .
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 biringuccite to the now independent class of "borates" and there in the department of "pentaborates". This is further subdivided according to the crystal structure, so that the mineral, according to its structure, can be found in the sub-section "Layer pentaborate (phyllo-pentaborate)", where together with nasinite the "biringuccite group" with the system no. 6.EC.05 forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns biringuccite, like the outdated Strunz system, to the common class of "carbonates, nitrates and borates" and there to the department and subdivision of the same name of "hydrous borates with hydroxyl or halogen" a. Here you can find him as the only member of the unnamed group 05/26/07 .
Crystal structure
Biringuccite crystallizes monoclinically in the space group P 2 1 / c (space group no. 14) with the lattice parameters a = 11.20 Å ; b = 6.56 Å; c = 20.76 Å and β = 93.9 ° and 8 formula units per unit cell .
Education and Locations
At its type locality Larderello, biringuccite was in close paragenesis with nasinite as incrustations on pipelines to the so-called "Hole of the Storehouse", which was drilled in 1927 near Lardarello. Larderello is also the only place where biringuccite has been found so far (as of 2013). Auripigment , Thénardite and quartz also appeared as further parageneses .
See also
literature
- Curzio Cipriani, Piero Vannuccini: Hoeferite [= biringuccite] e nasinite: due nuori borati fra i prodotti di Lardarello . In: Accademia Nazionale dei Lincei, Rendiconti della Classe di Scienze Fisiche, Matematiche e Naturali . Series VIII, No. 30 , 1962, pp. 74 .
- Michael Fleischer : New Mineral Names . In: American Mineralogist . tape 48 , 1963, pp. 708-712 ( minsocam.org [PDF; 382 kB ; accessed on June 17, 2018] Biringuccit (Mineral A) / Nasinite (Mineral B) from p. 2).
- Egizio Corazza, Silvio Menchetti, Cesare Sabelli: The crystal structure of nasinite, Na 4 [B 10 O 16 (OH) 2 ] · 2H 2 O . In: American Mineralogist . tape 59 , 1974, pp. 1005-1015 ( minsocam.org [PDF; 1.4 MB ; accessed on June 17, 2018]).
Web links
- Mineral Atlas: Biringuccite (Wiki)
- American-Mineralogist-Crystal-Structure-Database - Biringuccite (English)
Individual evidence
- ^ A b c Michael Fleischer : New Mineral Names . In: American Mineralogist . tape 48 , 1963, pp. 708-712 ( minsocam.org [PDF; 382 kB ; accessed on June 17, 2018] Biringuccit (Mineral A) / Nasinite (Mineral B) from p. 2).
- ↑ a b c d e f Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 351 .
- ↑ Webmineral - Biringuccite (English)
- ↑ a b c Biringuccite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 66 kB ; accessed on June 17, 2018]).
- ↑ a b c d Mindat - Biringuccite (English)
- ↑ Marco E. Ciriotti, Lorenza Fascio, Marco Pasero: Italian Type Minerals . 1st edition. Edizioni Plus - Università di Pisa, Pisa 2009, ISBN 978-88-8492-592-3 , p. 51 .
- ↑ Carl Hintze : Handbook of Mineralogy . Volume 3: new minerals and new mineral names (with additions, corrections and additions). Ed .: Karl F. Chudoba . de Gruyter, Berlin 1968, p. 486 ( limited preview in Google Book search).