Altisite (IMA symbol: Ati[1]) is an exceedingly rare alkaline titanium aluminosilicate chloride mineral with formula Na3K6Ti2Al2Si8O26Cl3, from alkaline pegmatites. It is named after its composition (ALuminium, TItanium, and SIlicon).[2][3][4]

Altisite
General
CategoryMineral
Formula
(repeating unit)
Na3K6Ti2Al2Si8O26Cl3
IMA symbolAti
Identification
ColorColourless
CleavageNone Observed
FractureConchoidal
Mohs scale hardness6
LusterVitreous
StreakWhite
Specific gravity2.64

The mineral crystallizes in the monoclinic crystal system with space group C2/m.[2]

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 Ferraris G., Khomyakov A. P.,and Ivaldi G. 1995: Altisite Na3K6Ti2[Al2Si8O26]Cl3 a new hyperalkaline aluminosilicate from Kola Peninsula (Russia) related to lemoynite: Crystal structure and thermal evolution. Eur. J. Mineral., 7, 537–546 in Jambor J. L., Pertsev N. N. i Roberts A. C. 1996: New mineral names. Am. Min., 81, 516-520, [1]
  3. ^ http://www.mindat.org/min-150.html Mindat
  4. ^ http://webmineral.com/data/Altisite.shtml Webmineral