Karibibite
A valid IMA mineral species
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About Karibibite
Formula:
Fe3+3(As3+O2)4(As3+2O5)(OH)
Formerly given as Fe2As4O9.
Specific Gravity:
4.07
Crystal System:
Orthorhombic
Name:
Named for the type locality.
Type Locality:
A rare iron arsenite. So far, it always originated as a weathering product of löllingite.
Visually similar to ludlockite.
Compare also 'UM1971-02-AsO:Fe'.
The structure seems to have been solved just recently (Mugnaioli, 2016; Colombo et al., 2017). The mineral is unique in being the only arsenite with structurally different anions (chains and dimers simultaneously), and is a representative of a small class of diarsenates(III) (or diarsenites).
Structure details:
(1) Fe3+O6 octahedra form bands along a; the bands are made of ribbons built of 3 edge-sharing octahedra, and the ribbons are joined via apices to give a kinked bond along a;
(2) the above bands are surrounded by (a) chains comprising AsO3 trigonal pyramids, and (b) As2O5 dimers;
(3) the dimers are connected by the O(3) atoms, thus giving zig-zag chains of the (As3+O2)-n stoichiometry.
Visually similar to ludlockite.
Compare also 'UM1971-02-AsO:Fe'.
The structure seems to have been solved just recently (Mugnaioli, 2016; Colombo et al., 2017). The mineral is unique in being the only arsenite with structurally different anions (chains and dimers simultaneously), and is a representative of a small class of diarsenates(III) (or diarsenites).
Structure details:
(1) Fe3+O6 octahedra form bands along a; the bands are made of ribbons built of 3 edge-sharing octahedra, and the ribbons are joined via apices to give a kinked bond along a;
(2) the above bands are surrounded by (a) chains comprising AsO3 trigonal pyramids, and (b) As2O5 dimers;
(3) the dimers are connected by the O(3) atoms, thus giving zig-zag chains of the (As3+O2)-n stoichiometry.
Unique Identifiers
Mindat ID:
2159
Long-form identifier:
mindat:1:1:2159:9
GUID
(UUID V4):
(UUID V4):
bd6cc122-3df0-429c-91c6-c2ea62da425b
IMA Classification of Karibibite
Approved
First published:
1973
Classification of Karibibite
4.JA.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
7.10.2.1
7 : MULTIPLE OXIDES
10 : AB4X9
7 : MULTIPLE OXIDES
10 : AB4X9
23.18
23 : Arsenites
23 : Arsenites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Kab | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Karibibite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Debbie Woolf | United Kingdom |
Physical Properties of Karibibite
Hardness Data:
Could not be measured
Tenacity:
Flexible
Density:
4.07(1) g/cm3 (Measured)
Comment:
Measured with a Berman balance
Optical Data of Karibibite
Type:
Biaxial (-)
RI values:
nα = 1.960 nβ = 2.100 nγ = 2.100
Max Birefringence:
δ = 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong
Pleochroism:
Weak
Comments:
Absorption parallel to the fiber axis is slightly higher (light brownish yellow) than perpendicular to it (straw yellow). The optic axial plane and γ-direction are parallel to the fiber axis.
Chemistry of Karibibite
Mindat Formula:
Fe3+3(As3+O2)4(As3+2O5)(OH)
Formerly given as Fe2As4O9.
Formerly given as Fe2As4O9.
Elements listed:
Crystallography of Karibibite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 7.2558(3) Å, b = 27.992(1) Å, c = 6.5243(3) Å
Ratio:
a:b:c = 0.259 : 1 : 0.233
Unit Cell V:
1325.1 ų
Z:
8
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.96 Å | (5) |
| 6.35 Å | (40) |
| 5.35 Å | (30) |
| 4.76 Å | (20) |
| 4.65 Å | (30) |
| 3.496 Å | (50) |
| 3.377 Å | (20b) |
| 3.262 Å | (25) |
| 3.176 Å | (80) |
| 3.088 Å | (70) |
| 3.040 Å | (30) |
| 2.968 Å | (5) |
| 2.910 Å | (5) |
| 2.802 Å | (80) |
| 2.672 Å | (45) |
| 2.384 Å | (100) |
| 2.110 Å | (15b) |
| 1.748 Å | (30b) |
| 1.729 Å | (15b) |
| 1.556 Å | (30) |
| 1.438 Å | (20) |
Comments:
ICDD 25-1405.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Karibibite
General Appearance of Type Material:
Radiating groups of sharply pointed, spindle-shaped bundles of fibers up to 1 mm in length.
Place of Conservation of Type Material:
1) Department of Earth Sciences, University of Leeds, Leeds, England.
2) Department of Geology, University of Helsinki, Helsinki, Finland.
2) Department of Geology, University of Helsinki, Helsinki, Finland.
Geological Setting of Type Material:
Pegmatite, secondary after loellingite
Associated Minerals at Type Locality:
Reference:
von Knorring, O., Sahama, T.G., Rehtijärvi, P. (1973) Karibibite, a new FeAs mineral from South West Africa. Lithos: 6: 265–272.
Synonyms of Karibibite
Other Language Names for Karibibite
German:Karibibit
Spanish:Karibibita
Common Associates
Associated Minerals Based on Photo Data:
| 36 photos of Karibibite associated with Löllingite | FeAs2 |
| 28 photos of Karibibite associated with Schneiderhöhnite | Fe2+Fe3+3As3+5O13 |
| 15 photos of Karibibite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 12 photos of Karibibite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 8 photos of Karibibite associated with Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 5 photos of Karibibite associated with Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 5 photos of Karibibite associated with Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
| 4 photos of Karibibite associated with Quartz | SiO2 |
| 2 photos of Karibibite associated with Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] |
| 2 photos of Karibibite associated with Fluorite | CaF2 |
Related Minerals - Strunz-mindat Grouping
| 4.JA. | Manganoschafarzikite | MnSb2O4 |
| 4.JA.05 | Leiteite | Zn(As2O4) |
| 4.JA.10 | Reinerite | Zn3(AsO3)2 |
| 4.JA.20 | Kusachiite | CuBi2O4 |
| 4.JA.20 | Schafarzikite | Fe2+Sb3+2O4 |
| 4.JA.20 | Trippkeite | Cu2+As3+2O4 |
| 4.JA.25 | Apuanite | Fe2+Fe3+4Sb3+4O12S |
| 4.JA.30 | Versiliaite | Fe2Fe4Sb6O16S |
| 4.JA.35 | Schneiderhöhnite | Fe2+Fe3+3As3+5O13 |
| 4.JA.40 | Zimbabweite | (Na,K)2PbAs4(Ta,Nb,Ti)4O18 |
| 4.JA.45 | Ludlockite | PbFe3+4As3+10O22 |
| 4.JA.50 | Paulmooreite | Pb2[As2O5] |
| 4.JA.55 | Stibivanite | Sb2VO5 |
| 4.JA.60 | Chadwickite | (UO2)[HAsO3] |
Fluorescence of Karibibite
Fluorescent yellow under 253 nm excitation
Other Information
Notes:
Easily soluble in dilute acids and in dilute alkali hydroxide solution.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Karibibite
mindat.org URL:
https://www.mindat.org/min-2159.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Karibibite
Reference List:
Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - Eds. (2016) Handbook of Mineralogy. https://www.handbookofmineralogy.org/
Localities for Karibibite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Brazil | |
| Atencio et al. (2004) |
| Physics Dep. - UFMG - Brazil |
| Sergio Varvello collection | |
| Luis Menezes |
Chile | |
| Kampf et al. (2013) +1 other reference |
| Arturo Molina collection (Jochen Schlüter ID) | |
France | |
| Queneau (n.d.) |
Indonesia | |
| Mineralium Deposita (2005) |
Japan | |
| Minato et al (1973) |
| Uehara et al. (2014) | |
| OHNISHI et al. (2013) | |
Kazakhstan | |
| Voloshin A.V. et al. (1989) |
Morocco | |
| Favreau et al. (2006) +1 other reference |
| Favreau et al. (2006) +1 other reference |
| Favreau et al. (2007) | |
| Favreau et al. (2006) +1 other reference |
| Favreau et al. (2006) |
| Favreau et al. (2006) |
Namibia (TL) | |
| von Knorring et al. (1973) |
| Mineralogical Museum Universität Hamburg collection (SEM-EDS- and PXRD-analysed) |
Norway | |
| Larsen et al. (2020) |
| Larsen (2013) |
Russia | |
| Alekseev et al. (2015) |
Spain | |
| Rewitzer C. +2 other references |
USA | |
| My personal collection |
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White Elephant Mine, Cicero Peak, Pringle, Custer Mining District, Custer County, South Dakota, USA