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Whitecapsite

This page kindly sponsored by Tony Nikischer
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About WhitecapsiteHide

Formula:
H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O
Colour:
Bright orange to golden-brownish orange
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
2.30
Crystal System:
Hexagonal
Name:
Named for the type locality, White Caps mine, Nye Co., Nevada
Unique combination of elements. Forms well-shaped hexagonal prismatic crystals terminated with bipyramidal faces.

The structure is based on the complex heteropolyhedral [(□,Fe2+)6Fe3+7Sb3O8(AsO4)9(H2O)30] cluster, which central part is the Fe3+O6 trigonal prism. The complex clusters are linked only via hydrogen bonds to water molecules residing in the interstitial space.


Classification of WhitecapsiteHide

Approved
Approval Year:
2012

Physical Properties of WhitecapsiteHide

Vitreous
Transparency:
Transparent
Colour:
Bright orange to golden-brownish orange
Streak:
yellowish
Hardness:
2 - 2½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none observed
Fracture:
None observed
Density:
2.30 g/cm3 (Measured)    2.297 g/cm3 (Calculated)

Optical Data of WhitecapsiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.590() nε = 1.603(3)
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of WhitecapsiteHide

Formula:
H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O
IMA Formula:
H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O

Crystallography of WhitecapsiteHide

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Setting:
P63/m
Cell Parameters:
a = 16.0916(8) Å, c = 21.7127(9) Å
Ratio:
a:c = 1 : 1.349
Unit Cell V:
4869 ų
Z:
1
Morphology:
Hexagonal prismatic crystals terminated with bipyramidal faces (forms: {110} and {111})

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.99(34)
11.73(100)
5.267(6)
3.644(4)
2.999(8)
2.757(4)
2.648(5)

Type Occurrence of WhitecapsiteHide

Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
Found in the oxidation zone of the White Caps gold deposit.
Associated Minerals at Type Locality:

Synonyms of WhitecapsiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Stibnite3 photos of Whitecapsite associated with Stibnite on mindat.org.

Other InformationHide

IR Spectrum:
confirms the presence of H+·nH2O complex cations and absence of OH groups (also confirmed by Raman spectroscopy)
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 WhitecapsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I. V., et al. (2012) Whitecapsite, The Story of a New Mineral Species From Nevada. Mineral News: 28(9): 1.
Pekov, I.V., Zubkova, N.V., Göttlicher, J., Yapaskurt, V.O., Chukanov, N.V., Lykova, I.S., Belakovskiy, D.I., Jensen, M.C., Leising, J.F., Nikischer, A.J. and Pushcharovsky, D.Y. (2012) Whitecapsite, IMA 2012-030. CNMNC Newsletter No. 14, October 2012, page 1285; Mineralogical Magazine: 76: 1281-1288.
Pekov, I.V., Zubkova, N.V., Goettlicher, J., Yapaskurt, V.O., Chukanov, N.V., Lykova, I.S., Belakovskiy, D.I., Jensen, M.C., Leising, J.F., Nikischer, A.J., Pushcharovsky D.Yu. (2014) Whitecapsite, a new hydrous iron and trivalent antimony arsenate mineral from the White Caps mine, Nevada, USA. European Journal of Mineralogy: 26: 577-587.

Internet Links for WhitecapsiteHide

Localities for WhitecapsiteHide

ⓘ - 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.
USA (TL)
 
  • Nevada
    • Nye Co.
      • Toquima Range
        • Manhattan District
          • Manhattan
Pekov, et al. (2012), Mineral News 28(9):1
Mineral and/or Locality  
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