Karibibite Mineral Data

Karibibite Mineral Data +

General Karibibite Information

Chemical Formula:

Fe+++2As+++4(O,OH)9

Composition:

Molecular Weight = 556.38 gm

Iron 20.08 % Fe 28.70 % Fe₂O₃

Arsenic 53.86 % As 71.12 % As₂O₃

Hydrogen 0.18 % H 1.62 % H₂O

Oxygen 25.88 % O

______ ______

100.00 % 101.44 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂As₄O₈(OH)

Environment:

In vugs in loellingite.

IMA Status:

Approved IMA 1973

Locality:

Karibib lithium pegmatite, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Karibibite Image

Images:

Karibibite

Comments: Orange yellow, radial sprays of karibibite on l?llingite to 0.75mm.
Location: Galileia, Minas Gerais, Brazil. Scale: picture size 5 mm.
© Tom Loomis / Dakota Matrix

Karibibite Crystallography

Axial Ratios:

a:b:c =4.2741:1:1.1026

Cell Dimensions:

a = 27.91, b = 6.53, c = 7.2, Z = 6; V = 1,312.22 Den(Calc)= 4.22

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 2.384(1), 2.808(0.8), 3.176(0.8),

Physical Properties of Karibibite

Color:

Brownish yellow.

Density:

4.07

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1-2 - Between Talc and Gypsum

Luminescence:

Fluorescent, Short UV=yellow.

Magnetism:

Paramagnetic

Streak:

light yellow

Optical Properties of Karibibite

Gladstone-Dale:

CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2496,KPDmeas= 0.2588,KC= 0.263

Optical Data:

Biaxial (-), a=1.96, b=2.1, g=2.1, bire=0.1400

Pleochroism (x):

straw yellow.

Pleochroism (y):

straw yellow.

Pleochroism (z):

light brownish yellow.

Calculated Properties of Karibibite

Electron Density:

r_electron=3.76 gm/cc
note: r_Karibibite=4.07 gm/cc.

Fermion Index

Fermion Index = 0.00438
Boson Index = 0.99562

Photoelectric:

PE_Karibibite= 44.01 barns/electron
U=PE_Karibibite x r_electron= 165.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Karibibite is Not Radioactive

Karibibite Classification

Dana Class:

7.10.2.1 (7)Multiple Oxides

(7.10)Dana Type

(7.10.2)Dana Group

7.10.2.1 Karibibite Fe2As4(O,OH)9 Unk Ortho

Strunz Class:

IV/J.07-10 IV - Oxides

IV/J - Arsenides with [AsO3]3-, [AsO2]-, [As2O5]4- groups and unclassified Arsenides

IV/J.07 - Karibibite - Ludlockite series

IV/J.07-10 Karibibite Fe2As4(O,OH)9 Unk Ortho

IV/J.07-20 Ludlockite (Fe,Pb)As2O6 A1 1

IV/J.07-20* Ludlockite-(Pb)* PbFe4As10O22 P1 1

Other Karibibite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Karibibite :
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 Karibibite Specimen Label here :

Karibibite

Fe+++2As+++4(O,OH)9
Dana No: 7.10.2.1 Strunz No: IV/J.07-10
Locality:

Notes: