Siidraite
A valid IMA mineral species
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Oleg I. Siidra
Formula:
Pb2Cu(OH)2I3
Colour:
Yellow
Lustre:
Vitreous
Specific Gravity:
6.505 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Oleg Iokhanesovich Siidra (b. 1981), Department of Crystallography, Saint Petersburg State University, Russia, for "his extensive work on secondary lead oxysalts and, in particular, on synthetic iodine-rich phases". Pronounced “see-dra-ite”.
New structure type. Siidraite has a unique composition and structure (the only currently known Pb-Cu-I mineral). It is the third naturally occurring halocuprate(I) after marshite and nantokite.
The second lead iodide mineral after mutnovskite, and fourth Pb- and I-bearing mineral after the latter, schwartzembergite, and seeligerite.
Known in only one single specimen, where it occurs as a secondary phase.
The second lead iodide mineral after mutnovskite, and fourth Pb- and I-bearing mineral after the latter, schwartzembergite, and seeligerite.
Known in only one single specimen, where it occurs as a secondary phase.
Unique Identifiers
Mindat ID:
50337
Long-form identifier:
mindat:1:1:50337:2
Similar Names
| Siderite | A valid IMA mineral species - grandfathered | FeCO3 |
| Siderite (meteorite) | A synonym of 'Iron group meteorite' | |
| Siderite (of Bergmann) | A synonym of Pharmacosiderite | |
| Siderite (of Daubrée) | ||
| Siderite (of Moll, 1799) | A synonym of Lazulite |
Classification of Siidraite
The cubane-like Pb4(OH)4 unit
The Pb4(OH)4 motif found in siidraite. This structural unit is also found in, for example, cubothioplumbite and nitroplumbite.
IMA Classification of Siidraite
Approved
IMA Formula:
Pb2+2Cu1+(OH)2I1-3
Approval year:
2016
First published:
2017
Type description reference:
3.DB.55
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
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 for Standard |
|---|---|---|
| Sii | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Siidraite
Vitreous
Transparency:
Translucent
Colour:
Yellow
Streak:
Yellow
Cleavage:
None Observed
Density:
6.505 g/cm3 (Calculated)
Chemistry of Siidraite
Mindat Formula:
Pb2Cu(OH)2I3
Element Weights:
Crystallography of Siidraite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Fddd
Setting:
Fddd
Cell Parameters:
a = 16.7082(9) Å, b = 20.846(1) Å, c = 21.016(1) Å
Ratio:
a:b:c = 0.802 : 1 : 1.008
Unit Cell V:
7320 ų
Z:
32
Morphology:
Crystalline grainy aggregates up to 0.3mm
Twinning:
Pseudomerohedral twinning on [01‾1]
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.539 Å | (60) |
| 3.312 Å | (76) |
| 3.299 Å | (54) |
| 3.296 Å | (69) |
| 3.270 Å | (81) |
| 2.746 Å | (100) |
| 2.738 Å | (77) |
| 2.690 Å | (64) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Siidraite
General Appearance of Type Material:
In crystalline grainy aggregates up to 0.3mm around relict galena
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum, London; registration numbers: BM 84642 (original specimen) and BM 2016,1 (analyzed crystal fragments)
Empirical Formula of Type Material:
Pb2.06Cu0.89(OH)2I2.97
Chemical Analysis of Type Material:
| Cu2O | 8.01 % |
|---|---|
| PbO | 50.01 % |
| I | 42.65 % |
| H2O | 2.02 % |
| Total: | 102.69 % |
Associated Minerals at Type Locality:
Synonyms of Siidraite
Other Language Names for Siidraite
Related Minerals - Strunz-mindat Grouping
| 3.DB. | Rickturnerite | Pb7O4[Mg(OH)4](OH)Cl3 |
| 3.DB.05 | Diaboleite | Pb2CuCl2(OH)4 |
| 3.DB.10 | Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| 3.DB.15 | Boleite | KPb26Ag9Cu24(OH)48Cl62 |
| 3.DB.20 | Cumengeite | Pb21Cu20Cl42(OH)40 · 6H2O |
| 3.DB.25 | Bideauxite | Pb2AgCl3(F,OH)2 |
| 3.DB.30 | Chloroxiphite | Pb3CuO2Cl2(OH)2 |
| 3.DB.35 | Hematophanite | Pb4Fe3O8(OH,Cl) |
| 3.DB.40 | Parkinsonite | Pb7MoO9Cl2 |
| 3.DB.40 | Janchevite | Pb9V5+(O10.25◻0.75)Cl2.5 |
| 3.DB.40 | Asisite | Pb7SiO9Cl2 |
| 3.DB.45 | Eddavidite | Cu12Pb2O15Br2 |
| 3.DB.45 | Murdochite | Cu12Pb2O15Cl2 |
| 3.DB.50 | Yedlinite | Pb6Cr3+Cl6(O,OH,H2O)8 |
Fluorescence of Siidraite
Non-fluorescent in mixed-wavelength UV light.
Other Information
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 Siidraite
mindat.org URL:
https://www.mindat.org/min-50337.html
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References for Siidraite
Localities for Siidraite
Showing 1 localities.
ⓘ - 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.
- 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.
Australia (TL) | |
| Hålenius et al. (2016) |
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