Aqualith
| Aqualith | |
|---|---|
| General and classification | |
| other names |
IMA 2002-066 |
| chemical formula | (H 3 O) 8 (Na, K, Sr) 5 Ca 6 Zr 3 [Cl | OH | {Si 3 O 5 (OH) 4 } 2 | (Si 9 O 27 · SiO) 2 ] |
|
Mineral class (and possibly department) |
Silicates and Germanates |
|
System no. to Strunz and to Dana |
9.CO.10 ( 8th edition : VIII / E.25) 64.01.01.15 |
| Crystallographic Data | |
| Crystal system | trigonal |
| Crystal class ; symbol | ditrigonal-pyramidal; 3 m |
| Room group (no.) | R 3 (No. 146) |
| Lattice parameters | a = 14.078 (3) Å ; c = 31.24 (1) Å Please complete the source as an individual reference |
| Formula units | Z = 3 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 4 to 5 |
| Density (g / cm 3 ) | measured: 2.58 (2); calculated: 2.66 |
| Cleavage | Please complete |
| Break ; Tenacity | shell-like |
| colour | light pink |
| Line color | White |
| transparency | transparent to translucent |
| shine | Glass gloss |
| Crystal optics | |
| Refractive indices |
n ω = 1.569 n ε = 1.571 |
| Birefringence | δ = 0.002 |
| Optical character | uniaxial positive |
The mineral Aqualith is a very rare ring silicate from the eudialyte group and has the chemical composition (H 3 O) 8 (Na, K, Sr) 5 Ca 6 Zr 3 [Cl | OH | {Si 3 O 5 (OH) 4 } 2 | (Si 9 O 27 · SiO) 2 ]. The elements indicated in the round brackets can represent each other in the formula ( substitution , diadochie), but are always in the same proportion to the other components of the mineral.
Aqualith crystallizes in the trigonal crystal system and develops transparent, isometric crystals up to about three centimeters in size, light pink in color with white streak color .
Etymology and history
The mineral was first discovered in 2002 in the Inagli massif in the Aldan highlands in eastern Siberia. It was analyzed and described by AP Khomyakov, GN Nechelyustov, RK Rastsvetaeva, who named it after the Latin word "aqua" for water in terms of its specific chemical composition.
Khomyakov, Nechelyustov and Rastsvetaeva submitted their test results and the chosen name to the International Mineralogical Association (IMA) for examination in the year of discovery (register no. IMA 2002-066 ). It was recognized as an independent mineral with the name Aqualith (English: Aqualite ) on April 3, 2003. The publication of the newly discovered mineral followed in 2007 in the Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Volume 2, pp. 39-55).
classification
Since the Aqualith was only recognized as an independent mineral in 2002, it is not listed in the Strunz mineral system (8th edition), which has been outdated since 2001 . Only the "Lapis mineral directory" published in 2008, which is still based on the classic system of Karl Hugo Strunz out of consideration for private collectors and institutional collections , lists the mineral under system no. VIII / E.25-05 .
The 9th edition of Strunz's mineral systematics, which has been in effect since 2001 and is used by the IMA, assigns the Aqualith to the class of "silicates and germanates" and there in the section of " ring silicates (cyclosilicates)". This division is, however, further subdivided according to the structure of the rings, so that the mineral can be found according to its structure in the sub-division "[Si 9 O 27 ] 18 - nine rings", where it is found together with alluaivite , dualite , carbokentbrooksite , eudialyte , Feklichevit , Ferrokentbrooksit , Georgbarsanovit , Golyshevit , Ikranit , Andrianovit , Johnsenit- (Ce) , Kentbrooksit , Khomyakovit , Labyrinthit , Manganokhomyakovit , Mogovidit , Oneillit , Raslakit , Rastsvetaevit , Taseqit and Zirsilit- (Ce) , the "Eudialytgruppe" with the system No. 9.CO.10 forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Aqualith to the class of "silicates and germanates", but there in the department of "ring silicates: rings with other anions and insular silicate groups". Here he is also in the "eudialyte group" with the system no. 64.01.01 and the other members Eudialyt, Alluaivit, Kentbrooksit, Khomyakovite, Manganokhomyakovit, Oneillit, Ferrokentbrooksit, Ikranit, Feklichevit, Rastsvetaevit, Taseqit, Carbokentbrooksit, Zirsilit- (Ce), Georgbarinthit- (Ce), Georgbarsanit, Ceovite, Ceovite , Golyshevit, Mogovidit and Voronkovite can be found in the subsection “ Ring Silicates: Rings with Other Anions and Insular Silicate Groups with Mixed Ring Types ”.
Education and Locations
Aqualith formed in hydrothermally converted peralkaline Pegmatiten where it inter alia, in Paragenesis with Aegirin , Batisit , Eckermanit , galena , Innelit , Lorezenit , microcline , natrolite and thorite occurs.
Apart from its type locality Inagli massif in the Aldan highlands, Aqualith has so far (as of 2012) only been found in the “ phlogopite mine” near Kowdor on the Kola peninsula in Russia.
Crystal structure
Aqualith crystallizes trigonally in the space group R 3 (space group no. 146) with the lattice parameters a = 14.078 (3) Å and c = 31.24 (1) Å; as well as 3 formula units per unit cell .
See also
literature
- AP Khomyakov, GN Nechelyustov, RK Rastsvetaeva (2007): Aqualite, a new mineral species of the eudialyte group from the Inagli alkaline pluton, Sakha-Yakutia, Russia, and the problem of oxonium in hydrated eudialytes , in: Geology of Ore Deposits , Volume 49/8, pp. 739-751 doi : 10.1134 / S1075701507080089
- John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols: Aqualite , in: Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 76.3 kB )
Web links
- Mineral Atlas: Aqualith (Wiki)
Individual evidence
- ↑ a b c Stefan Weiss: The large Lapis mineral directory. All minerals from A - Z and their properties . 5th completely revised and supplemented edition. Weise, Munich 2008, ISBN 978-3-921656-70-9 .
- ↑ Webmineral - Aqua Lite
- ↑ a b c Mindat - Aqualite