Thomsenolite
Thomsenolite (obelisks) and some pseudocubic ralstonite (picture center)
General
CategoryHalide minerals
Formula
(repeating unit)
NaCaAlF6·H2O
IMA symbolTse[1]
Strunz classification3.CB.40
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/b
Identification
ColorColourless, white, pale lilac; brownish or reddish tinted due to staining; colourless in transmitted light.
CleavagePerfect
On {001}; {110} distinct.
FractureIrregular/ uneven
TenacityBrittle
Mohs scale hardness2
LustreVitreous, pearly
StreakWhite
DiaphaneityTransparent, translucent
Density2.981 g/cm3

Thomsenolite is a mineral with formula: NaCaAlF6·H2O. It is an alteration product of cryolite.[2]

It was discovered in 1868 in Ivigtut, Greenland and named for Hans Peter Jorgen Julius Thomsen (1826–1909).[3]

References

  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. "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2019-05-08. Retrieved 2012-08-18.
  3. Mindat.org entry


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