Jump to content

Hsianghualite

From Wikipedia, the free encyclopedia
Hsianghualite
Hsianghualite from the type locality. Specimen size 1.5 cm
General
CategoryZeolite
Formula
(repeating unit)
Li2Ca3(BeSiO4)3F2
IMA symbolHsi[1]
Strunz classification9.GB.05 (10 ed)
8/J.16-10 (8 ed)
Dana classification77.1.1.5
Crystal systemIsometric
Crystal classTetartoidal (23)
H-M symbol: (23)
Space groupI213,[2] originally reported as 4 3 2[3]
Identification
Formula mass475.4 g/mol
ColorWhite or colorless
Crystal habittrisoctahedral or dodecahedral crystals or granular masses[3]
CleavageNone
TenacityBrittle[4]
Mohs scale hardness6.5
LusterVitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.97 to 3.00, measured[5]
Refractive indexn = 1.6132[3]

Hsianghualite is a tectosilicate (framework silicate) of lithium, calcium and beryllium, with fluorine, a member of the zeolite group. It was discovered in 1958 and named for the type locality, Hsiang Hua, 香花, meaning fragrant flower.

Structure

[edit]

Structure is analogous to that of analcime with Be and Si in tetrahedral co-ordination forming a three-dimensional framework.[2] Its space group is I213[2] (Previously reported as I4132[3]). Unit cell parameters are a = 12.879 or 12.897,[3][5] and Z = 8.

Environment

[edit]

It occurs within phlogopite veins in the light-coloured band of green and white banded metamorphosed Devonian limestone which has been intruded by beryllium-bearing granite.[6] Associated mineral include fluorite, liberite, chrysoberyl, taaffeite and nigerite.[2]

Localities

[edit]

Hsianghualite has been found only at the type locality, the Xianghualing Mine in Linwu County, Hunan Province, China.

References

[edit]
  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c d Gaines et al (1997) Dana's New Mineralogy Eighth Edition
  3. ^ a b c d e American Mineralogist (1959) 44:1327 English language abstract of Huang Yung-hwei, Tu Shaohua, Wang K'ung-hai, Chao Chun-Lin, and Yu Cheng-Chih (1958)Ti-chih-yueh-k'an 7: 35 (in Chinese)
  4. ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Hsianghualite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 14 March 2022.
  5. ^ a b American Mineralogist (1961) 46:244. Data from A A Beus (1960) Akademii Nauk SSSR 1-329 (in Russian).
  6. ^ Roberts, Campbell and Rapp (1990) Encyclopedia of Minerals, 2nd edition
[edit]