Jarlite Mineral Data

Jarlite Mineral Data +

General Jarlite Information

Chemical Formula:

Na(Sr,Na,[ ])7(Mg,[ ])Al6F32(OH,H2O)2

Composition:

Molecular Weight = 1,393.57 gm

Barium 0.99 % Ba 1.10 % BaO

Sodium 3.30 % Na 4.45 % Na₂O

Strontium 35.84 % Sr 42.38 % SrO

Lithium 0.10 % Li 0.21 % Li₂O

Calcium 0.58 % Ca 0.80 % CaO

Magnesium 0.87 % Mg 1.45 % MgO

Aluminum 12.00 % Al 22.68 % Al₂O₃

Hydrogen 0.33 % H 2.97 % H₂O

Oxygen 2.64 % O

Fluorine 43.35 % F 43.35 % F

- % F -18.25 % -O=F₂

______ ______

100.00 % 101.15 % = TOTAL OXIDE

Empirical Formula:

NaSr_5.7NaCa_0.2Li_0.2Ba_0.1Mg_0.5Al_6.2F_31.8(H₂O)_2.3

Environment:

In vugs in a cryolite deposit with other fluorides.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

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

Name Origin:

Named for Carl Frederik Jarl (1872-19510, Formerly President of the Danish Cryolite Company, who first noted the mineral.

Synonym:

ICSD 40143

PDF 5-594

Jarlite Image

Images:

Jarlite

Comments: Tan radial botryoidal waxy masses of jarlite in matrix.
Location: Ivigtut, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jarlite Crystallography

Axial Ratios:

a:b:c =1.4732:1:0.6691

Cell Dimensions:

a = 15.942, b = 10.821, c = 7.241, Z = 2; beta = 101.86° V = 1,222.47 Den(Calc)= 3.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.98(1), 3.19(0.9), 2.15(0.7),

Crystal Structure:

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Hawthorne F C , The Canadian Mineralogist , 21 (1983) p.553-560, The crystal structure of jarlite

Physical Properties of Jarlite

Color:

Colorless, Gray white, White.

Density:

3.87

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Spherical - Spherical, rounded aggregates.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Jarlite

Gladstone-Dale:

CI meas= 0.274 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.259 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1142,KPDmeas= 0.1118,KC= 0.154

Optical Data:

Biaxial (+/-), a=1.429, b=1.433, g=1.436, bire=0.0070, 2V(Calc)=80, 2V(Meas)=90.

Calculated Properties of Jarlite

Electron Density:

r_electron=3.51 gm/cc
note: r_Jarlite=3.79 gm/cc.

Fermion Index

Fermion Index = 0.02781
Boson Index = 0.97219

Photoelectric:

PE_Jarlite= 45.93 barns/electron
U=PE_Jarlite x r_electron= 161.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jarlite is Not Radioactive

Jarlite Classification

Dana Class:

11.6.10.1 (11)Halide Complexes; Alumino-fluorides

(11.6)with miscellaneous formulae

(11.6.10)Dana Group

11.6.10.1 Jarlite Na(Sr,Na,[])7(Mg,[])Al6F32(OH,H2O)2 C 2/m 2/m

11.6.10.2 Calcjarlite Na(Ca,Sr)3Al3(F,OH)16 C 2/m 2/m

11.6.10.3 Jorgensenite! Na2(Sr,Ba)14Na2Al12F64(OH,F) C 2/m 2/m

Strunz Class:

III/B.03-50 III - Halogenides

III/B - Double halogenides without water, with [BF4]1-,[SiF6]2- and [AlF6]3-

III/B.03 - Kryolithionite - Calcjarlite series

III/B.03-10 Cryolithionite Na3Li3Al2F12 I a3d 4/m 3 2/m

III/B.03-20 Colquiriite CaLiAlF6 P 3c 3 2/m

III/B.03-25 Simmonsite! Na2LiAlF6 P 2₁/n 2/m

III/B.03-30 Cryolite Na3AlF6 P 2₁/n 2/m

III/B.03-40 Elpasolite K2NaAlF6 F m3m 4/m 3 2/m

III/B.03-45 Bogvadite Na2SrBa2Al4F20 Pnmn,Pn2n Ortho

III/B.03-48 Jorgensenite! Na2(Sr,Ba)14Na2Al12F64(OH,F) C 2/m 2/m

III/B.03-50 Jarlite Na(Sr,Na,[])7(Mg,[])Al6F32(OH,H2O)2 C 2/m 2/m

III/B.03-60 Calcjarlite Na(Ca,Sr)3Al3(F,OH)16 C 2/m 2/m

Other Jarlite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Jarlite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Jarlite

Na(Sr,Na,[ ])7(Mg,[ ])Al6F32(OH,H2O)2
Dana No: 11.6.10.1 Strunz No: III/B.03-50
Locality:

Notes: