Kogarkoite Mineral Data

Kogarkoite Mineral Data +

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General Kogarkoite Information

Chemical Formula:

Na3(SO4)F

Composition:

Molecular Weight = 184.03 gm

Sodium 37.48 % Na 50.52 % Na₂O

Sulfur 17.42 % S 43.51 % SO₃

Oxygen 34.78 % O

Fluorine 10.32 % F 10.32 % F

- % F -4.35 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃(SO₄)F

Environment:

Sublimate from steam issuing from the spring. Also in nepheline syenite pegmatites in Russia.

IMA Status:

Approved IMA 1973

Locality:

Hortense Hot Springs, Chalk Creek, Chaffee County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Lia Nikolaevna Kofarko (1936-), Russian geochemist, who first noticed the mineral in Russia.

Synonym:

ICSD 31145

PDF 25-827

Kogarkoite Image

Images:

Kogarkoite

Comments: Pale green granular mass of kogarkoite with yellow native sulfur.
Location: Vulcano, Sicily, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kogarkoite Crystallography

Axial Ratios:

a:b:c =2.6008:1:1.6462

Cell Dimensions:

a = 18.073, b = 6.949, c = 11.44, Z = 12; beta = 107.71° V = 1,368.65 Den(Calc)= 2.68

Crystal System:

MonoclinicSpace Group: Unk (pseudo HEX-R)

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

By Intensity(I/I_o): 3.48(1), 2.718(0.85), 2.991(0.85),

Crystal Structure:

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Pabst A , Sharp W N , American Mineralogist , 58 (1973) p.116-127, Kogarkoite, a new natural phase in the system Na2SO4 - NaF - NaCl

View Additional jPOWD Structure files for Kogarkoite
[1]

Physical Properties of Kogarkoite

Color:

Colorless, White, Light blue.

Density:

2.676 - 2.679, Average = 2.67

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kogarkoite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.077 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1642,KPDmeas= 0.1643,KC= 0.1778

Optical Data:

Biaxial (+), a=1.439, b=1.439, g=1.442, bire=0.0030

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Kogarkoite

Electron Density:

r_electron=2.62 gm/cc
note: r_Kogarkoite=2.68 gm/cc.

Fermion Index

Fermion Index = 0.00147
Boson Index = 0.99853

Photoelectric:

PE_Kogarkoite= 1.70 barns/electron
U=PE_Kogarkoite x r_electron= 4.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kogarkoite is Not Radioactive

Kogarkoite Classification

Dana Class:

30.1.6.1 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.1)where (A B)m (XO4)p Zq where m:p>2:1

(30.1.6)Dana Group

30.1.6.1 Kogarkoite Na3(SO4)F Unk (pseudo HEX-R) Mono

Strunz Class:

VI/B.12-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.12 - Sulphohalite - Caracolite series

VI/B.12-10 Sulphohalite Na6(SO4)2FCl F m3m 4/m 3 2/m

VI/B.12-20 Galeite Na15(SO4)5F4Cl P 3m 3m

VI/B.12-30 Schairerite Na21(SO4)7F6Cl P 3₁m 3m

VI/B.12-40 Kogarkoite Na3(SO4)F Unk (pseudo HEX-R) Mono

VI/B.12-50 Cesanite Na7Ca3(SO4)6(OH)·0.8(H2O) P 6 6

VI/B.12-60 Caracolite Na3Pb2(SO4)3Cl P 2₁/m 2/m

Other Kogarkoite Information

References:

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

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Print or Cut-and-Paste your Kogarkoite Specimen Label here :

Kogarkoite

Na3(SO4)F
Dana No: 30.1.6.1 Strunz No: VI/B.12-40
Locality:

Notes: