Ye'elimit
| Ye'elimit | |
|---|---|
 |
|
| General and classification | |
| other names |
|
| chemical formula | Ca 4 Al 6 [O 12 | SO 4 ] |
|
Mineral class (and possibly department) |
anhydrous sulfates with foreign anions |
|
System no. to Strunz and to Dana |
7.BC.15 ( 8th edition : VI / B.04) 01/30/15/01 |
| Similar minerals | Sodalite |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | pentagon-icositetrahedral; 432 |
| Space group | I 4 1 32 (No. 214) |
| Lattice parameters | a = 18.39 Å |
| Formula units | Z = 16 |
| Physical Properties | |
| Mohs hardness | not defined |
| Density (g / cm 3 ) | calculated: 2.61 |
| Cleavage | not defined |
| colour | white, colorless |
| Line color | White |
| transparency | translucent |
| shine | Please complete |
| Crystal optics | |
| Refractive index | n = 1.568 |
| Other properties | |
| Chemical behavior | hydrates easily |
Ye'elimit (also Yeélimit or Yeelimit ) is a very rarely occurring mineral from the mineral class of " sulfates ( and relatives )". It crystallizes in the cubic crystal system with the chemical composition Ca 4 Al 6 [O 12 | SO 4 ] and has so far only been found in the form of translucent, colorless to white mineral aggregates , consisting of crystals up to 15 μm in size .
Etymology and history
Ye'elimit was first discovered together with Ellestadit at Har Je'elim (English: Har Ye'elim) in the southern district of Israel and described in 1984 by the Israeli mineralogist Shulamit Gross (1923–2012), who named the mineral after its type locality .
Type material of the mineral is stored in the Geochemical Department of the Geological Survey, as well as in the Geological Department of the Hebrew University of Jerusalem in Israel (Catalog No. 62815).
classification
In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the Ye'elimit belonged to the mineral class of "sulfates, selenates , tellurates , chromates , molybdates and tungstates " and there to the department of "anhydrous sulfates with foreign anions ", where he formed an independent group with D'Ansit .
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 Ye'elimit to the class of "sulfates (selenates, tellurates, chromates, molybdates and wolframates)" and there into the department the “sulfates (selenates etc.) with additional anions, without H 2 O”. However, this section is further subdivided according to the size of the cations involved , so that the mineral can be found according to its composition in the sub-section “With medium-sized and large cations”, where it is the only member of the unnamed group 7.BC.15 .
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Ye'elimit to the class of "sulfates, chromates and molybdates" and there to the category of "anhydrous sulfates with hydroxyl or halogen ". Here he is to be found as the only member of the unnamed group 01/30/15 within the subdivision of " Anhydrous sulfates with hydroxyl or halogen and (AB) m (XO 4 ) p Z q , with m: p> 2: 1 ".
Crystal structure
Ye'elimit crystallizes cubically in the space group I 4 1 32 (space group no. 214) with the lattice parameter a = 18.39 Å and 16 formula units per unit cell .
properties
Ye'elimit hydrates easily and converts in water (H 2 O) to ettringite (Ca 6 Al 2 [(OH) 12 | (SO 4 ) 3 ] · 26H 2 O) and Al (OH) 3 .
Education and Locations
Ye'elimite is part of a high-temperature mineral assemblage consisting of the minerals Larnite , brownmillerite , ellestadite , Fluormayenit exists and ye'elimite. The formation conditions of> 900 ° C at low pressure correspond to the sanidinite facies .
In nature, Ye'elimit has so far only been found in the vicinity of Har Je'elim and Nahal Je'elim in the Hatrurim Basin in Israel and in a basalt quarry near Klöch in the Austrian district of Southeast Styria (Styria). Another point of discovery, the waste dump in Ronneburg , no longer exists today.
use
Ye'elimit (according to construction chemistry notation C 4 A 3 S , also called calcium sulfoaluminate, CSA, or "Klein's Compound") is of economic importance in cement production . Ye'elimit is the most important reactive component in sulfataluminate cements . In the presence of water and easily soluble sulfate, e.g. B. in the form of anhydrite , gypsum or bassanite , it converts into water-containing ettringite , which forms a stable microstructure of needle-like, interlocked crystals during the hardening process . Ye'elimit-containing cement clinker is industrially manufactured from a mixture of limestone , bauxite and natural or synthetic gypsum or anhydrite or from secondary raw materials containing calcium , aluminum and sulfur , which are burned in rotary kilns at temperatures between 950 ° C and 1350 ° C .
See also
literature
- Shulamit Gross: Occurence of Ye'elimit and Ellestadite in an unusual cobble from the "Pseudo-Conglomerate" of the Hatrurim basin, Israel . In: Geological Survey of Israel . tape 84 , 1983, pp. 1-4 (English).
- FC Hawthorne, KW Bladh, EAJ Burke, ES Grew, RH Langley, J. Puciewicz, AC Roberts, RA Schedler, JE Shigley, DA Vanko: New mineral names . In: American Mineralogist . tape 72 , 1987, pp. 226–227 (English, minsocam.org [PDF; 1,2 MB ; accessed on November 3, 2018]).
Web links
- Mineral Atlas: Ye'elimit (Wiki)
- Mindat - Ye'elimite (English)
- Webmineral - Yeelimite (English)
- American-Mineralogist-Crystal-Structure-Database - Ye'elimit (English)
Individual evidence
- ↑ 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. 372 (English).
- ↑ Dmitriy I. Belakovskiy, Olivier C. Gagne: New Mineral Names . In: American Mineralogist . tape 100 , 2015, p. 1649–1654 (English, minsocam.org [PDF; 285 kB ; accessed on November 3, 2018] Description of Shulamitite and life data by Shulamit Gross, pp. 5-6).
- ↑ Shulamit Gross: Occurence of Ye'elimit and Ellestadite in an unusual cobble from the "Pseudo-Conglomerate" of the Hatrurim basin, Israel . In: Geological Survey of Israel . tape 84 , 1983, pp. 1-4 (English).
- ↑ Ye'elimite . 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; 65 kB ; accessed on November 3, 2018]).
- ↑ Find location list for Ye'elimit at the Mineralienatlas and at Mindat
- ↑ Mineralienatlas : Type locality Absetzerhalde, Uranerzrevier Ronneburg / Thuringia
- ↑ V. Kasselouri, P. Tsakiridis, C. Malami, B. Georgali, C. Alexandridou: A study on the hydration products of a non-expansive sulfoaluminate cement . In: Cement and Concrete Research . tape 25 , no. 8 , December 1995, p. 1726–1737 , doi : 10.1016 / 0008-8846 (95) 00168-9 (English).
- ↑ J. Beretka, B. de Vito, L. Santoro, N. Sherman, GL Valenti: Hydraulic Behavior of Calcium Sulfoaluminate-based Cements derived from Industrial Process Wastes . In: Cement and Concrete Research . tape 23 , no. 5 , 1993, p. 1205-1214 , doi : 10.1016 / 0008-8846 (93) 90181-8 (English).