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Mesaite

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Formula:
CaMn2+5(V2O7)3·12H2O
Colour:
Orangish red
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.74
Crystal System:
Monoclinic
Name:
For Mesa County where the type locality is located.
Structurally related to fianelite. Chemically similar to palenzonaite. Other divanadate minerals include engelhauptite, karpenkoite, martyite, and volborthite.

The structure is based on zigzag chains comprising edge-sharing MnO6 octahedra. Octahedra-hosted oxygens are shared with divanadate groups, that provide a link to adjacent octahedral chains; thus {010} heteropolyhedral layers are formed. Calcium and water are located in the interlayer space; each [7]Ca atoms are bonded to (1) two O6 atoms of the heteropolyhedral layer and (2) to two fully occupied and six partially occupied O (water) sites.


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Classification of MesaiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of MesaiteHide

Vitreous
Transparency:
Transparent
Colour:
Orangish red
Streak:
Light pinkish orange
Hardness:
Comment:
ca. 2
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Parting:
none
Fracture:
Irregular/Uneven
Density:
2.74(1) g/cm3 (Measured)    2.744 g/cm3 (Calculated)

Optical Data of MesaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.760 nβ = 1.780(5) nγ = 1.795(5)
2V:
Measured: 81° (2)
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong (r > v)
Comments:
Brownish orange (various shades)
Comments:
α is calculated.

Chemical Properties of MesaiteHide

Formula:
CaMn2+5(V2O7)3·12H2O
IMA Formula:
CaMn2+5(V2O7)3 · 12H2O

Crystallography of MesaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Cell Parameters:
a = 9.135(2) Å, b = 10.427(3) Å, c = 15.530(4) Å
β = 102.650(7)°
Ratio:
a:b:c = 0.876 : 1 : 1.489
Unit Cell V:
1,443.34 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Blades up to 0.1 mm long
Comment:
P2/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.47Å(100)
8.60Å(10)
4.30Å(11)
3.568Å(24)
3.132Å(11)
3.067Å(17)
2.881Å(25)
2.615Å(11)

Type Occurrence of MesaiteHide

General Appearance of Type Material:
Orange blades, up to 0.1 mm long
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County,Los Angeles, California, USA, catalogue numbers 65595,65596,65597, 65598 and 65599
Geological Setting of Type Material:
Asphaltum blocks associated with montroseite- and corvusite-bearing sandstone. Oxidation in a moist environment.
Associated Minerals at Type Locality:

Synonyms of MesaiteHide

Fluorescence of MesaiteHide

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 MesaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Nash, B.P., Marty, J. and Hughes, J.M. (2015) Mesaite,IMA2015-069. CNMNC Newsletter No. 28, December 2015, page 1861; Mineralogical Magazine, 79, 1859–1864
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2017) Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 81: 319–327.

Internet Links for MesaiteHide

Localities for MesaiteHide

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.
USA (TL)
 
  • Colorado
    • Mesa Co.
      • Gateway
Kampf, A.R., Nash, B.P., Marty, J. and Hughes, J.M. (2015) Mesaite,IMA2015-069. CNMNC Newsletter No. 28, December 2015, page 1861. Mineralogical Magazine: 79: 1859–1864.; Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2017) Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 81: 319–327.
 
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