Iquiqueite Mineral Data

Iquiqueite Mineral Data +

General Iquiqueite Information

Chemical Formula:

K3Na4Mg(Cr++++++O4)B24O39(OH)·12(H2O)

Composition:

Molecular Weight = 1,466.16 gm

Potassium 8.00 % K 9.64 % K₂O

Sodium 6.27 % Na 8.45 % Na₂O

Magnesium 1.66 % Mg 2.75 % MgO

Chromium 3.55 % Cr 6.82 % CrO₃

Boron 17.70 % B 56.98 % B₂O₃

Hydrogen 1.72 % H 15.36 % H₂O

Oxygen 61.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Na₄Mg(CrO₄)B₂₄O₃₉(OH)·12(H₂O)

Environment:

Generally disseminated in nitratine ore.

IMA Status:

Approved IMA 1986

Locality:

Iquique, Tarapaca Province, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Iquiqueite Image

Images:

Iquiqueite Nitratine

Comments: Yellow iquiqueiite in clear, massive nitration.
Location: Salar de Miraje, Antofagasta, Chile. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Iquiqueite Crystallography

Axial Ratios:

a:c = 1:2.59158

Cell Dimensions:

a = 11.6369, c = 30.158, Z = 3; V = 3,536.78 Den(Calc)= 2.06

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁c

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

By Intensity(I/I_o): 2.856(1), 3.02(1), 10.11(0.85),

Physical Properties of Iquiqueite

Cleavage:

[0001] Perfect, [0110] Indistinct

Color:

Yellow.

Density:

2.05

Diaphaniety:

Transparent

Fracture:

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

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Iquiqueite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2303,KPDmeas= 0.2315,KC= 0.238

Optical Data:

Uniaxial (-), e=1.447, w=1.502, bire=0.0550.

Calculated Properties of Iquiqueite

Electron Density:

r_electron=2.04 gm/cc
note: r_Iquiqueite=2.05 gm/cc.

Fermion Index

Fermion Index = 0.04054
Boson Index = 0.95946

Photoelectric:

PE_Iquiqueite= 1.95 barns/electron
U=PE_Iquiqueite x r_electron= 3.98 barns/cc.

Radioactivity:

GRapi = 114.94 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Iquiqueite - barely detectable

Iquiqueite Classification

Dana Class:

27.1.8.1 (27)Compound Borates

(27.1)Dana Type

(27.1.8)Dana Group

27.1.8.1 Iquiqueite K3Na4Mg(CrO4)B24O39(OH)·12(H2O) P 3₁c 3m

Strunz Class:

VI/F.03-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/F - Chromates [CrO4]2-

VI/F.03 - Iquiquieite

VI/F.03-10 Iquiqueite K3Na4Mg(CrO4)B24O39(OH)·12(H2O) P 3₁c 3m

Other Iquiqueite 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 Iquiqueite :
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 -École des Mines de Paris

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

Iquiqueite

K3Na4Mg(Cr++++++O4)B24O39(OH)·12(H2O)
Dana No: 27.1.8.1 Strunz No: VI/F.03-10
Locality:

Notes: