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

Name Pronunciation:

Iquiqueite + Pronunciation

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 Pyramidal H-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

Diaphaneity:

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
Ncalc = 1.49

Optical Data:

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

Calculated Properties of Iquiqueite

Electron Density:

Bulk Density (Electron Density)=2.04 gm/cc
note: Specific Gravity of Iquiqueite =2.05 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

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)
Concentration of Iquiqueite per GRapi unit = 0.87 (%)

Estimated Radioactivity from Iquiqueite - barely detectable

Iquiqueite Classification

Dana Class:

27.01.08.01 (27)Compound Borates

(27.01)Dana Type

(27.01.08)Dana Group

27.01.08.01 Iquiqueite K3Na4Mg(CrO4)B24O39(OH)•12(H2O) P 3₁c 3m

Strunz Class:

06.HA.20 06 - BORATES

06.H - Unclassified Borates

06.HA -Unclassified borates

06.HA.20 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Iquiqueite

K3Na4Mg(Cr++++++O4)B24O39(OH)•12(H2O)
Dana No: 27.01.08.01 Strunz No: 06.HA.20
Locality:

Notes:

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