Bukovskýit
| Bukovskýit | |
|---|---|
 |
|
| General and classification | |
| other names |
|
| chemical formula | (Fe III ) 2 [AsO 4 | SO 4 | OH] • 7H 2 O |
|
Mineral class (and possibly department) |
Phosphates, arsenates and vanadates |
|
System no. to Strunz and to Dana |
8.DB.40 ( 8th edition : VII / D.05) 43.05.01.02 |
| Crystallographic Data | |
| Crystal system | triclinic |
| Crystal class ; symbol | triclinic pedial 1 or triclinic pinacoidal 1 |
| Room group (no.) | P 1 or P 1 (No. 1 or 2) |
| Lattice parameters |
a = 10.72 Å ; b = 14.08 Å; c = 10.28 Å α = 93.5 °; β = 116.0 °; γ = 90.3 ° |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | not defined (soft) |
| Density (g / cm 3 ) | measured: 2.334; calculated: 2.336 |
| Cleavage | imperfect after {010} |
| Break ; Tenacity | uneven, earthy |
| colour | yellowish green to greyish green |
| Line color | light yellowish |
| transparency | translucent |
| shine | Please complete |
| Other properties | |
| Chemical behavior | easily soluble in hydrochloric acid (HCl) |
Bukovskýite is a very rarely occurring mineral from the mineral class of " phosphates , arsenates and vanadates ". It crystallizes in the triclinic crystal system with the composition (Fe III ) 2 [AsO 4 | SO 4 | OH] · 7H 2 O, so it is chemically a water-containing iron arsenate with hydroxide and sulfate complex as additional anions .
Bukovskýit is translucent and develops only small, needle-shaped crystals up to about 0.5 millimeters in length, which are usually arranged in radial or grape-like to bulbous mineral aggregates . Its color varies between yellowish green and greyish green, but its line color is light yellowish.
Etymology and history
Bukovskýit was first discovered near Kaňk (Kutná Hora) in the Czech Republic and described in 1967 by František Novák, Pavel Povondra and Jiří Vtelenský, who named the mineral after Antonín Bukovský (1865–1950). He had already analyzed the mineral in 1914 and called the material “the poisonous soil of Kutná Hora”.
F. Slavík also examined the Bukovský type material, but considered it to be an inhomogeneous mixture or a mineral of the Pitticit group and published some additional data on this substance in 1925. He passed a sample of the material on to F. Ulrich. In his short report, he based himself on the chemical analysis of Bukovský and his own optical investigation and found that the mineral was very similar to the already known Destinezite . Only the [PO 4 ] 3− groups were replaced by homologous [AsO 4 ] 3− . For this reason Ulrich gave the new mineral the preliminary name arsendestinezite , but did not publish a detailed investigation report. F. Slavík, however, mentioned Ulrich's article in a 1932 report in the "Mineralogical Abstracts", which was also cited in 1951 by AN Winchell and H. Winchell.
The mineral designated as Destinezite turned out to be a crystalline variety of the mineral Diadochite in later investigations and the name and the derived name Arsendestinezite for Bukovskýite were therefore initially discredited. Since 2002, the redefined destinecite with the formula (Fe III ) 2 [PO 4 | SO 4 | OH] · 6H 2 O has been considered an independent mineral again.
In older publications, the mineral name is sometimes found in the spelling Bukovskyite or Bukowskyite (without an acute over the y) or with w instead of v, which does not, however, correspond to the specifications for mineral naming of the IMA, for example for minerals after a person, it must be ensured that the spelling of the name is used (the only exceptions are spaces and capital letters, which are removed from the mineral name). The inconsistent spelling of their names in many minerals was corrected with the publication “Tidying up Mineral Names: an IMA-CNMNC Scheme for Suffixes, Hyphens and Diacritical marks” in 2008 and the Bukovskýit has been spelled internationally since then with the associated acute.
Type material of the mineral Bukovskýit was deposited in the Charles University in Prague (register no. 14240) and the Prague National Museum (register no. 53411).
classification
In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the Bukovskýite belonged to the mineral class of "phosphates, arsenates and vanadates" and there to the department of "water-containing phosphates with foreign anions ", where it belongs together with diadochite , pitticit , sarmientite and Zýkait formed the unnamed group VII / D.05 .
The 9th edition of Strunz's mineral classification, which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also assigns Bukovskýite to the class of “phosphates, arsenates and vanadates” and there to the category of “phosphates, etc. with additional anions; with H 2 O “. However, this section is further subdivided according to the relative size of the cations involved and the molar ratio of the other anions to the phosphate, arsenate or vanadate complex (RO 4 ), so that the mineral can be classified in the sub-section “With only medium-sized cations; (OH etc.): RO 4 <1: 1 “can be found, where it is the only member of the unnamed group 8.DB.40 .
Also the systematics of minerals according to Dana , which is mainly used in the English-speaking area , assigns the Bukovskýite to the class of "phosphates, arsenates and vanadates" and there in the department of "phosphates". Here it is together with Sanjuanite and Sarmientite in the "Sarmientite group" with the system no. 43.05.01 within the subsection " Compound phosphates etc., (water-containing compound anions with hydroxyl or halogen) ".
Crystal structure
Bukovskýite crystallizes triclinically in the space group P 1 or P 1 (space group no. 1 or 2) with the lattice parameters a = 10.72 Å ; b = 14.08 Å; c = 10.28 Å; α = 93.5 °; β = 116.0 ° and γ = 90.3 ° as well as four formula units per unit cell .
properties
Bukovskýit is easily soluble in hydrochloric acid (HCl).
Education and Locations
Bukovskýit was found in old spoil heaps of medieval mines and formed secondarily as a weathering product from arsenopyrite . In addition to arsenopyrite, pyrite and quartz also occur as accompanying minerals .
As a rare mineral formation, Bukovskýite has so far (as of 2012) only been found at a few sites, with around ten sites being known. In addition to its type locality Kaňk, where the mineral occurs in tubers up to 60 centimeters in size, the mineral has so far occurred in the Czech Republic in the nearby Šafary mine and in the village of Poličany, which belongs to Kutná Hora.
The only previously known site in Germany is the Christbescherung mine near Großvoigtsberg in the Saxon Ore Mountains.
In Austria, Bukovskýit could be found in the Pöllatal (Lieserkar) in Carinthia and at several sites in the Siglitz-Bockhart-Erzwies district in the Gastein Valley , at the Hohen Sonnblick and in the arsenic mine at the Rotgüldensee in Salzburg.
Another location near Lavrio in the Greek region of Attica has not yet been confirmed.
See also
literature
- František Novák, Pavel Povondra, Jiní Vtelenský: Bukovsýkite, Fe 3+ 2 (AsO 4 ) (SO 4 ) (OH). 7 H 2 O, from Kank, near Kutná Hora - a new mineral , in: Acta Universitatis Carolinae - Geologica , Volume 4 (1967), pp. 297-325 ( PDF 1.24 MB )
Web links
Individual evidence
- ↑ a b Hans Jürgen Rösler : Textbook of Mineralogy . 4th revised and expanded edition. German publishing house for basic industry (VEB), Leipzig 1987, ISBN 3-342-00288-3 , p. 638 .
- ↑ a b Friedrich Klockmann : Klockmanns textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke , Stuttgart 1978, ISBN 3-432-82986-8 , pp. 649, 840 (first edition: 1891).
- ↑ a b c d e 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. 495 .
- ↑ a b c d John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols: Bukovskýite , in: Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 66.5 kB )
- ↑ a b Novák et al .: Bukovsýkite ... (see literature)
- ↑ Mindat - Destinezite
- ^ Ernest H. Nickel , Joel D. Grice: The IMA Commission on New Minerals and Minerala Names: Procedures and Guidelines on Mineral Nomenclature , In: The Canadian Mineralogist , Volume 36 (1998); PDF 328 kB , from p. 8
- ^ Ernst AJ Burke: Tidying up Mineral Names: an IMA-CNMNC Scheme for Suffixes, Hyphens and Diacritical marks , In: Mineralogical Record , Volume 39, No. 2 (March – April 2008); PDF 2.7 MB
- ↑ IMA / CNMNC List of Mineral Names 2009 (PDF 1.8 MB); For the current mineral list, see the IMA website
- ↑ a b Mindat - Bukovskýite
- ↑ Petr Korbel, Milan Novák: Mineral Encyclopedia . Nebel Verlag GmbH, Eggolsheim 2002, ISBN 3-89555-076-0 , p. 185 ( Dörfler Natur ).