Thomsenolite Mineral Data

Thomsenolite Mineral Data +

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General Thomsenolite Information

Chemical Formula:

NaCaAlF6·(H2O)

Composition:

Molecular Weight = 222.06 gm

Sodium 10.35 % Na 13.96 % Na₂O

Calcium 18.05 % Ca 25.25 % CaO

Aluminum 12.15 % Al 22.96 % Al₂O₃

Hydrogen 0.91 % H 8.11 % H₂O

Oxygen 7.21 % O

Fluorine 51.33 % F 51.33 % F

- % F -21.62 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCaAlF₆·(H₂O)

Environment:

Alteration product of cryolite.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Ivigtut, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Hans Peter Jorgen Julius Thomsen (1826-1909), Daniosh physical chemist and founder of the Greenland cryolite industry.

Synonym:

ICSD 60801

PDF 22-1360

Thomsenolite Image

Images:

Click Here for Larger Thomsenolite Image

Thomsenolite Cryolite

Comments: Massive, white cryolite with solution cavities lined with prismatic Thomsenolite crystals.
Location: Ivigtut, Greenland. Scale: .
© John Veevaert

Thomsenolite Crystallography

Axial Ratios:

a:b:c =1.0127:1:2.9272

Cell Dimensions:

a = 5.57, b = 5.5, c = 16.1, Z = 4; beta = 96.383° V = 490.17 Den(Calc)= 3.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.02(1), 1.963(0.9), 1.996(0.8),

Crystal Structure:

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Cocco G , Castiglione P C , Vagliasindi G , Acta Crystallographica , 23 (1967) p.162-166, The crystal structure of thomsenolite, Locality: Ivigtut, Greenland

Physical Properties of Thomsenolite

Cleavage:

[001] Perfect, [110] Imperfect

Color:

Colorless, White, Reddish, Brownish.

Density:

2.98

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Thomsenolite

Gladstone-Dale:

CI meas= 0.227 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.235 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1369,KPDmeas= 0.1382,KC= 0.1788

Optical Data:

Biaxial (-), a=1.4072, b=1.4136, g=1.415, bire=0.0078

Calculated Properties of Thomsenolite

Electron Density:

r_electron=2.90 gm/cc
note: r_Thomsenolite=2.98 gm/cc.

Fermion Index

Fermion Index = 0.00027
Boson Index = 0.99973

Photoelectric:

PE_Thomsenolite= 3.06 barns/electron
U=PE_Thomsenolite x r_electron= 8.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thomsenolite is Not Radioactive

Thomsenolite Classification

Dana Class:

11.6.6.1 (11)Halide Complexes; Alumino-fluorides

(11.6)with miscellaneous formulae

(11.6.6)Dana Group

11.6.6.1 Thomsenolite NaCaAlF6·(H2O) P 2₁/c 2/m

Strunz Class:

III/C.02-20 III - Halogenides

III/C - Double halogenides with water, Fluorides

III/C.02 - Pachnolite - Yaroslavite series

III/C.02-10 Pachnolite NaCaAlF6·(H2O) F2/d 2/m

III/C.02-20 Thomsenolite NaCaAlF6·(H2O) P 2₁/c 2/m

III/C.02-30 Yaroslavite Ca3Al2F10(OH)2·(H2O) Unk Ortho

Other Thomsenolite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Thomsenolite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Thomsenolite

NaCaAlF6·(H2O)
Dana No: 11.6.6.1 Strunz No: III/C.02-20
Locality:

Notes: