Hsianghualith

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Hsianghualith
Hsianghualite.jpg
Hsianghualite (white) from Xianghualing, Hunan Province, China.
Sample size: 1.5 cm
General and classification
chemical formula Ca 3 Li 2 [F 2 | Be 3 Si 3 O 12 ]
Mineral class
(and possibly department) 		Silicates and Germanates
System no. to Strunz
and to Dana 		9.GB.05 ( 8th edition : VIII / J.16)
77.1.1.5
Crystallographic Data
Crystal system cubic
Crystal class ; symbol cubic tetrahedral pentagon dodecahedral 23
Space group I 2 1 3
Lattice parameters a  = 12.87  Å
Formula units Z  = 8
Physical Properties
Mohs hardness 6.5
Density (g / cm 3 ) 2.97 to 3, mean 2.98
Cleavage no
colour White
Line color White
transparency transparent to translucent
shine Glass gloss

Hsianghualith is a rarely occurring mineral from the mineral class of " silicates and germanates ". It crystallizes in the cubic crystal system with the chemical composition Ca 3 Li 2 [F 2 | Be 3 Si 3 O 12 ] and develops mostly granular to massive, often colorless or white and translucent mineral aggregates .

Etymology and history

Hsianghualith was first discovered in Xianghualing Mine (English: Hsianghualing Mine ) in Chenzhou in the province of Hunan in China and described in 1957 by the scientist Huang Yunhui that the mineral after its type locality named. The Chinese word ( Chinese  香花 石 , Pinyin xiānghuāshí ) also stands for "fragrant flower".

classification

In the old (8th Edition) and the new classification of minerals (9th Edition) by Strunz part of Hsianghualith to the Department of framework silicates (tectosilicates). This department has been further subdivided and partially redefined since the new edition of Strunz's mineral system, so that the mineral is now in the department and subdivision “Tectosilicates with zeolitic H 2 O; Zeolite family ”.

The systematics of minerals according to Dana sorts the Hsianghualith into the department “Tectosilicate Zeolite group” (translated: framework silicate, zeolite group ), and there into the “Analcime and related species” (translated: Analcime and related species ).

Education and Locations

The mineral was found in phlogopite veins in Devonian skarns ( metamorphic limestones ) in the province of Hunan in China.

Except at its type locality Xianghualing Mine (Hsianghualing Mine), the mineral has not yet been detected anywhere.

Crystal structure

Hsianghualith crystallizes in a cubic-tetrahedral pentagondodecahedral structure in the space group I 2 1 3 and the lattice parameter a = 12.87  Å as well as 8 formula units per unit cell .

See also

Individual evidence

  1. ↑ 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. 700 .
  2. ^ A b Xianghualing Mine (Hsianghualing Mine). Mindat.org
  3. ↑ Handbook of Mineralogy - Hsianghualite (English, PDF 65 kB)
  4. ↑ Webmineral - New Dana Classification of Tektosilicates Tectosilicate Zeolite group (English)
  5. ^ New Mineral Names. Hsiang-hua-Shi (PDF; 637 kB) Volume 44, No. 11/12, November / December, 1959, pp. 1327-1328. [Note: The notation W.-H. Huang is a transcription error]

Web links

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