Fuenzalidaite Mineral Data

Fuenzalidaite Mineral Data +

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General Fuenzalidaite Information

Chemical Formula:

K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)

Composition:

Molecular Weight = 4,191.42 gm

Potassium 6.53 % K 7.87 % K₂O

Sodium 4.94 % Na 6.65 % Na₂O

Magnesium 5.80 % Mg 9.62 % MgO

Hydrogen 0.58 % H 5.16 % H₂O

Sulfur 9.18 % S 22.92 % SO₃

Iodine 36.33 % I 47.78 % I₂O₅

Oxygen 36.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₇Na₉Mg₁₀(SO₄)₁₂(IO₃)₁₂·12(H₂O)

Environment:

In veins and veinlets of white nitrate ore called caliche blanco.

IMA Status:

Approved IMA 1994

Locality:

A former nitrate mine about 1 km south of the former plant site of Oficina Santa Luisa, Chile. Link to MinDat.org Location Data.

Name Origin:

For Humberto Fuenzalida P. (1904-1966), who planned and directed the first school of geology at the University of Chile.

Synonym:

ICSD 77416

IMA1993-021

PDF 47-1851

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Fuenzalidaite Crystallography

Axial Ratios:

a:c = 1:2.88832

Cell Dimensions:

a = 9.4643, c = 27.336, Z = 1; V = 2,120.52 Den(Calc)= 3.28

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3c1

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

By Intensity(I/I_o): 3.927(1), 13.67(0.5), 3.023(0.41),

Crystal Structure:

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Konnert J A , Evans H T , McGee J J , Ericksen G E , American Mineralogist , 79 (1994) p.1003-1008, Mineralogical studies of the nitrate deposits of Chile: VII. Two saline, minerals with the composition K6(Na,K)4Na6Mg10(XO4)12(IO3)12.12H2O:, Fuenzalidaite (X=S) and carloruizite (X=Se)

Physical Properties of Fuenzalidaite

Cleavage:

[110] Good

Color:

White, Pale yellow.

Density:

3.31

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fuenzalidaite

Gladstone-Dale:

CI meas= 0.059 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1886,KPDmeas= 0.1869,KC= 0.1986

Optical Data:

Uniaxial (-), e=1.615, w=1.622, bire=0.0070.

Calculated Properties of Fuenzalidaite

Electron Density:

r_electron=3.09 gm/cc
note: r_{Fuenzalidaite}=3.28 gm/cc.

Fermion Index

Fermion Index = 0.00667
Boson Index = 0.99333

Photoelectric:

PE_{Fuenzalidaite}= 131.55 barns/electron
U=PE_{Fuenzalidaite} x r_electron= 406.00 barns/cc.

Radioactivity:

GRapi = 88.68 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Fuenzalidaite - barely detectable

Fuenzalidaite Classification

Dana Class:

23.1.2.1 (23)Compound Iodates

(23.1)with miscellaneous formulae

(23.1.2)Dana Group

23.1.2.1 Fuenzalidaite K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O) P 3c1 3 2/m

23.1.2.2 Carlosruizite K6(Na,K)4Na6Mg10(SeO4)12(IO3)12·12(H2O) P 3c1 3 2/m

23.1.2.3 Georgeericksenite! Na6CaMg(IO3)6(CrO4)2·12(H2O) C 2/c 2/m

Strunz Class:

VI/D.16-50 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.16 - Darapskite - Humberstonite series

VI/D.16-10 Darapskite Na3(SO4)(NO3)·(H2O) P 2₁/m 2/m

VI/D.16-20 Ungemachite K3Na8Fe(SO4)6(NO3)2·6(H2O) R 3 3

VI/D.16-30 Clinoungemachite K3Na9Fe(SO4)6(OH)3·9(H2O)? (pseudo-HEX-R) Mono

VI/D.16-40 Humberstonite K3Na7Mg2(SO4)6(NO3)2·6(H2O) R 3 3

VI/D.16-50 Fuenzalidaite K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O) P 3c1 3 2/m

VI/D.16-60 Carlosruizite K6(Na,K)4Na6Mg10(SeO4)12(IO3)12·12(H2O) P 3c1 3 2/m

VI/D.16-70 Georgeericksenite! Na6CaMg(IO3)6(CrO4)2·12(H2O) C 2/c 2/m

Other Fuenzalidaite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.79,p1003-1008,1994) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Fuenzalidaite :
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

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

Fuenzalidaite

K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)
Dana No: 23.1.2.1 Strunz No: VI/D.16-50
Locality:

Notes: