Ianthinite
A valid IMA mineral species - grandfathered
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About Ianthinite
Formula:
U4+(UO2)5O7 · 10H2O
Colour:
Violet-black; dark violet in transmitted light
Lustre:
Sub-Metallic
Hardness:
2 - 3
Specific Gravity:
5.16
Crystal System:
Orthorhombic
Name:
From the Greek ιάνθινος ("ianthinos"), violet colored, in allusion to its color.
Not very stable under ambient conditions; will dehydrate to schoepite (while becoming yellow and opaque) and further members of the schoepite group.
May be confused with nollmotzite.
Sheets in the crystal structure are similar to those in rameauite, spriggite and wyartite.
May be confused with nollmotzite.
Sheets in the crystal structure are similar to those in rameauite, spriggite and wyartite.
Unique Identifiers
Mindat ID:
2000
Long-form identifier:
mindat:1:1:2000:4
GUID
(UUID V4):
(UUID V4):
e6434618-bc11-4c22-8a39-59e8ed6fcd64
IMA Classification of Ianthinite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
U4+2(UO2)4O6(OH)4 · 9H2O
First published:
1926
Classification of Ianthinite
4.GA.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
Dana 7th ed.:
5.6.1.1
5.6.1.1
5 : OXIDES CONTAINING URANIUM OR THORIUM
6 : AX6O17·xH2O
5 : OXIDES CONTAINING URANIUM OR THORIUM
6 : AX6O17·xH2O
7.16.7
7 : Oxides and Hydroxides
16 : Oxides of U
7 : Oxides and Hydroxides
16 : Oxides of U
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 |
---|---|---|
Ian | 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 Ianthinite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Ianthinite
Sub-Metallic
Transparency:
Transparent
Colour:
Violet-black; dark violet in transmitted light
Streak:
Brown, violet
Hardness:
2 - 3 on Mohs scale
Cleavage:
Perfect
Perfect on {001}
Perfect on {001}
Density:
5.16(5) g/cm3 (Measured) 5.00 g/cm3 (Calculated)
Optical Data of Ianthinite
Type:
Biaxial (-)
RI values:
nα = 1.674 nβ = 1.900 nγ = 1.920
2V:
Measured: 58° , Calculated: 30°
Max Birefringence:
δ = 0.246
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:
r > v perceptible
Pleochroism:
Visible
Comments:
X = c = colourless
Y = b = violet
Z = a = dark violet
Y = b = violet
Z = a = dark violet
Chemistry of Ianthinite
Mindat Formula:
U4+(UO2)5O7 · 10H2O
Elements listed:
Crystallography of Ianthinite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Amm2
Cell Parameters:
a = 11.52(5) Å, b = 7.15(2) Å, c = 30.3(1) Å
Ratio:
a:b:c = 1.611 : 1 : 4.238
Unit Cell V:
2,495.75 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tiny rectangular plates {001} elongated [010]. Also prismatic [010], or thick tabular {001}.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0013139 | Ianthinite | Burns P C, Finch R J, Hawthorne F C, Miller M L, Ewing R C (1997) The crystal structure of ianthinite, [U4+2(UO2)4O6(OH)4](H2O)5: a possible phase for Pu4+ incorporation during the oxidation of spent nuclear fuel Journal of Nuclear Materials 249 199-206 | 1997 | Shinkolobwe mine, Shaba, southern Congo | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.63 Å | (FF) |
3.81 Å | (m) |
3.24 Å | (m) |
3.59 Å | (fm) |
3.35 Å | (fm) |
2.61 Å | (f) |
2.53 Å | (f) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
27 : Radioactive decay; auto-oxidation | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Ianthinite
General Appearance of Type Material:
Acicular crystals
Place of Conservation of Type Material:
n.d.
Associated Minerals at Type Locality:
Reference:
Schoep, A. (1926) Over janthiniet, een nieuw uranium mineraal uit Katanga. Natuurwetenschappelijk Tijdschrift: 7: 97-99.
Synonyms of Ianthinite
Other Language Names for Ianthinite
Simplified Chinese:水斑铀矿
Spanish:Ianthinita
Lanthinita
Lanthita
Lanthinita
Lanthita
Common Associates
Associated Minerals Based on Photo Data:
28 photos of Ianthinite associated with Schoepite | (UO2)8O2(OH)12 · 12H2O |
6 photos of Ianthinite associated with Parauranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
2 photos of Ianthinite associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
2 photos of Ianthinite associated with Uranopilite | (UO2)6(SO4)O2(OH)6 · 14H2O |
2 photos of Ianthinite associated with Uraninite | UO2 |
1 photo of Ianthinite associated with Umohoite | (UO2)MoO4 · 2H2O |
1 photo of Ianthinite associated with Arsenuranospathite | Al(UO2)2(AsO4)2F · 20H2O |
1 photo of Ianthinite associated with Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
1 photo of Ianthinite associated with Pyrite | FeS2 |
1 photo of Ianthinite associated with Curite | Pb3(H2O)2[(UO2)4O4(OH)3]2 |
Related Minerals - Strunz-mindat Grouping
4.GA.05 | Metaschoepite | (UO2)8O2(OH)12 · 10H2O |
4.GA.05 | Paraschoepite | UO3 · 2H2O |
4.GA.05 | Schoepite | (UO2)8O2(OH)12 · 12H2O |
4.GA.15 | Metastudtite | UO4 · 2H2O |
4.GA.15 | Studtite | [(UO2)(O2)(H2O)2] · H2O |
4.GA.20 | Paulscherrerite | UO2(OH)2 |
4.GA.25 | Heisenbergite | UO2(OH) · 2H2O (simplified UO3 · 2H2 O) |
Other Information
Notes:
Radioactive.
Alters upon heating with dilute hydrogen peroxide, turning brown, then yellow.
Alters upon heating with dilute hydrogen peroxide, turning brown, then yellow.
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 Ianthinite
mindat.org URL:
https://www.mindat.org/min-2000.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
References for Ianthinite
Reference List:
Bignand, Claude (1955) Sur les propriétés et les synthèses de quelques minéraux uranifères. Bulletin de Minéralogie, 78 (1) 1-26 doi:10.3406/bulmi.1955.4985
Localities for Ianthinite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| Bottrill (2018) |
Brazil | |
| Pires et al. (2014) |
DR Congo (TL) | |
| Guillemin et al. (1959) +2 other references |
Gauthier et al. (1989) | |
Egypt | |
| Hussein et al. (1988) |
France | |
| - (1998) |
J. Chervet et G. Branche : ... +1 other reference | |
| - (1998) |
J. Geffroy | |
| Marcel Roubault et al. (1960 -1965) +1 other reference |
| Lièvre et al. (2002) |
| Lièvre et al. (2002) |
| - (1998) |
- (1998) | |
| - (1998) |
| Bariand et al. (1993) +1 other reference |
| [Le Cahier des Micromonteurs |
- (1998) | |
Germany | |
| 90 +4 other references |
| |
| |
| Weiß (1990) |
Dill et al. (2010) | |
Greece | |
| Rieck et al. (2018) |
India | |
| Singh et al. (2015) |
| SINGH et al. (2014) |
Italy | |
| Olmi F. |
| Campostrini et al. (2006) |
Mexico | |
| |
www.swri.org (2001) | |
Slovakia | |
| Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
USA | |
| Eckel et al. (1997) |
| Am Min 50:909-923 +1 other reference |
Eckel et al. (1997) |
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Krunkelbach Valley Uranium deposit, Menzenschwand, St Blasien, Waldshut, Freiburg Region, Baden-Württemberg, Germany