Hanksite Mineral Data

Hanksite Mineral Data +

General Hanksite Information

Chemical Formula:

KNa22(SO4)9(CO3)2Cl

Composition:

Molecular Weight = 1,564.92 gm

Potassium 2.50 % K 3.01 % K₂O

Sodium 32.32 % Na 43.57 % Na₂O

Carbon 1.54 % C 5.62 % CO₂

Sulfur 18.44 % S 46.05 % SO₃

Chlorine 2.27 % Cl 2.27 % Cl

- % Cl -0.51 % -O=Cl₂

Oxygen 42.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KNa₂₂(SO₄)₉(CO₃)₂Cl

Environment:

Continental evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1885

Locality:

Searles Lake, San Bernardino Co. California. Link to MinDat.org Location Data.

Name Origin:

Named for H. G. Hanks, American geologist.

Synonym:

ICSD 2852

PDF 25-1348

Hanksite Image

Images:

Hanksite

Comments: Translucent, hexagonal crystal of hanksite.
Location: Searles Lake, San Bernardino Co., California, USA. Scale: Crystal size 3 cm.
© Dave Barthelmy

Hanksite Crystallography

Axial Ratios:

a:c = 1:2.02483

Cell Dimensions:

a = 10.47, c = 21.2, Z = 2; V = 2,012.61 Den(Calc)= 2.58

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 2.61(1), 2.78(1), 3.78(1),

Forms:

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Forms: [ 1 0 0] [ 1 0 1]

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Crystal Structure:

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Araki T , Zoltai T , American Mineralogist , 58 (1973) p.799-801, The crystal structure of hanksite

Physical Properties of Hanksite

Cleavage:

[0001] Good

Color:

Colorless, Gray, Grayish black, Yellow, Yellowish white.

Density:

2.5

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hanksite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1826,KPDmeas= 0.1884,KC= 0.1892

Optical Data:

Uniaxial (-), e=1.461, w=1.481, bire=0.0200.

Calculated Properties of Hanksite

Electron Density:

r_electron=2.46 gm/cc
note: r_Hanksite=2.50 gm/cc.

Fermion Index

Fermion Index = 0.00176
Boson Index = 0.99824

Photoelectric:

PE_Hanksite= 2.04 barns/electron
U=PE_Hanksite x r_electron= 5.03 barns/cc.

Radioactivity:

GRapi = 35.47 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hanksite - barely detectable

Hanksite Classification

Dana Class:

32.3.1.1 (32)Compound Sulfates

(32.3)(anhydrous) with poly-anionic formula

(32.3.1)Dana Group

32.3.1.1 Hanksite KNa22(SO4)9(CO3)2Cl P 6₃/m 6/m

Strunz Class:

VI/B.14-30 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/B.14 - Hectorfloresite - Hanksite series

VI/B.14-10 Hectorfloresite Na9(IO3)(SO4)4 P 2₁/a 2/m

VI/B.14-20 Burkeite Na6(CO3)(SO4)2 P mmm 2/m 2/m 2/m

VI/B.14-30 Hanksite KNa22(SO4)9(CO3)2Cl P 6₃/m 6/m

Other Hanksite Information

References:

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

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Hanksite

KNa22(SO4)9(CO3)2Cl
Dana No: 32.3.1.1 Strunz No: VI/B.14-30
Locality:

Notes: