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Mendozavilite-KCa

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About Mendozavilite-KCaHide

Formula:
[K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3]
Colour:
Greenish yellow
Lustre:
Sub-Adamantine, Vitreous
Hardness:
Crystal System:
Monoclinic
First recognized as a potential hypothetical member of the Betpakdalite group (IMA 10-E). Later in 2011, approved by IMA as a valid species.


Classification of Mendozavilite-KCaHide

Approved
Approval Year:
2011

Physical Properties of Mendozavilite-KCaHide

Sub-Adamantine, Vitreous
Transparency:
Transparent
Colour:
Greenish yellow
Streak:
Very pale yellowish green
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Parting:
{001}
Fracture:
Irregular/Uneven

Optical Data of Mendozavilite-KCaHide

Type:
Biaxial (+)
RI values:
nα = 1.780(5) nβ = 1.795(5) nγ = 1.817
2V:
Measured: 80° (10)
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v, strong
Pleochroism:
Non-pleochroic

Chemical Properties of Mendozavilite-KCaHide

Formula:
[K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3]
IMA Formula:
[K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3]

Crystallography of Mendozavilite-KCaHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.909(5) Å, b = 10.897(2) Å, c = 14.958(4) Å
β = 129.780(9)°
Ratio:
a:b:c = 1.735 : 1 : 1.373
Unit Cell V:
2368.6 ų
Morphology:
Pseudeohexagonal, tabular crystals up to 0.5 mm across and 0.05 mm thick. Forms observed: {001},{110},{111},{20-1} and {110}
Twinning:
Ubiquitous: Contact on {001} and penetration, both on roatation of 120° about [102].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.643(16)
8.850(100)
7.369(34)
3.675(16)
3.125(26)
2.998(25)
2.846(16)
2.018(21)

Type Occurrence of Mendozavilite-KCaHide

General Appearance of Type Material:
Greenish yellow pseudohexagonal crystals on massive vein quartz
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63315 and 63572
Associated Minerals at Type Locality:

Synonyms of Mendozavilite-KCaHide

Relationship of Mendozavilite-KCa to other SpeciesHide

Other Members of this group:
Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
Mendozavilite-NaCu[Na2(H2O)15Cu(H2O)6][Mo8P2Fe3+3O34(OH)3] Mon. 2/m : B2/m
Mendozavilite-NaFe[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]Mon. 2/m : B2/m

Fluorescence of Mendozavilite-KCaHide

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 Mendozavilite-KCaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J., Rumsey, M.S., Spratt, J. and Dini, M. (2012): Mendozavilite-KCa, IMA 2011-088. CNMNC Newsletter No. 12, February 2012, page 154; Mineralogical Magazine, 76, 151-155
Kampf, A.R., Mills, S.J., Rumsey, M. S., Dini, M., Birch, W. D., Spratt, J., Pluth, J.J., Steele, I. M., Jenkins, R. A., and Pinch, W. W. (2012): The heteromolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76(5): 1175-1207.

Internet Links for Mendozavilite-KCaHide

Localities for Mendozavilite-KCaHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Chile (TL)
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Chuquicamata District
Kampf, A.R., Mills, S.J., Rumsey, M.S., Spratt, J. and Dini, M. (2012): Mendozavilite-KCa, IMA 2011-088. CNMNC Newsletter No. 12, February 2012, page 154; Mineralogical Magazine, 76, 151-155; Kampf, A.R., Mills, S.J., Rumsey, M. S., Dini, M., Birch, W. D., Spratt, J., Pluth, J.J., Steele, I. M., Jenkins, R. A., and Pinch, W. W. (2012): The heteromolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine: 76(5): 1175-1207.
Mineral and/or Locality  
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