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Siidraite

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Formula:
Pb2Cu(OH)2I3
Colour:
Yellow
Lustre:
Vitreous
Specific Gravity:
6.505 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Oleg Iokhanesovich Siidra, Department of Crystallography, Saint Petersburg State University, Russia.
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 secondary phase.


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Classification of SiidraiteHide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of SiidraiteHide

Vitreous
Transparency:
Translucent
Colour:
Yellow
Streak:
Yellow
Cleavage:
None Observed
Density:
6.505 g/cm3 (Calculated)

Chemical Properties of SiidraiteHide

Formula:
Pb2Cu(OH)2I3

Crystallography of SiidraiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.539(60)
3.312(76)
3.299(54)
3.296(69)
3.270(81)
2.746(100)
2.738(77)
2.690(64)

Type Occurrence of SiidraiteHide

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:
Cu2O8.01 %
PbO50.01 %
I42.65 %
H2O2.02 %
Total:102.69 %
Associated Minerals at Type Locality:
Reference:
Rumsey, M-S., Welch, M.D., Kleppe, A.K., Spratt, J. (2017) Siidraite, Pb2Cu(OH)2I3, from Broken Hill, New South Wales, Australia: the third halocuprate(I) mineral. European Journal of Mineralogy: 29: 1027-1030.

Synonyms of SiidraiteHide

Fluorescence of SiidraiteHide

Non-fluorescent in mixed-wavelength UV light.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SiidraiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rumsey, M.S., Welch, M.D., Kleppe, A.K., Spratt, J. (2016) Siidraite, IMA 2016-039. CNMNC Newsletter No. 33, October 2016, page 1137. Mineralogical Magazine: 80: 1135–1144.
Rumsey, M-S., Welch, M.D., Kleppe, A.K., Spratt, J. (2017) Siidraite, Pb2Cu(OH)2I3, from Broken Hill, New South Wales, Australia: the third halocuprate(I) mineral. European Journal of Mineralogy: 29: 1027-1030.

Internet Links for SiidraiteHide

Localities for SiidraiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
Rumsey, M.S., Welch, M.D., Kleppe, A.K., Spratt, J. (2016) Siidraite, IMA 2016-039. CNMNC Newsletter No. 33, October 2016, page 1137; Mineralogical Magazine: 80: 1135–1144
Mineral and/or Locality  
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