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Nestolaite

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About NestolaiteHide

Fabrizio Nestola
Formula:
CaSeO3·H2O
Colour:
Light violet
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.18
Crystal System:
Monoclinic
Name:
Named in honour of Fabrizio Nestola (b. 1972), Italian mineralogist and crystallographer University of Padova, Padova, Italy.
First purely calcium selenate mineral; second Ca-bearing selenate after piretite.

The crystal structure is based on layers, with sheets of edge-sharing CaO-H2O polyhedra, with [7]Ca; the sheets are interconnected by selenate groups, while the adjacent ones are linked through hydrogen bonds. The Se4+ cations are stacked up towards the interlayer.


Classification of NestolaiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of NestolaiteHide

Vitreous
Transparency:
Transparent
Colour:
Light violet
Streak:
White
Hardness:
2½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100}
Fracture:
Irregular/Uneven
Density:
3.18(2) g/cm3 (Measured)    3.163 g/cm3 (Calculated)

Optical Data of NestolaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.642(3) nβ = 1.656(3) nγ = 1.722(6)
2V:
Measured: 55° (5), Calculated: 51°
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic
Comments:
It does not show pleochroism but has strong pseudo-absorption caused by high birefringence

Chemical Properties of NestolaiteHide

Formula:
CaSeO3·H2O
IMA Formula:
CaSeO3 · H2O

Crystallography of NestolaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.6502(9) Å, b = 6.7473(10) Å, c = 7.9358(13) Å
β = 108.542(12)°
Ratio:
a:b:c = 1.134 : 1 : 1.176
Unit Cell V:
388.37 ų
Z:
4
Morphology:
As mm-large aggregates consisting of tightly intergrown oblique-angled, flattened to acicular crystals up to 30 μm long and up to 7 μm (very rarely up to 15 μm) thick.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.277(100)
4.949(37)
3.767(29)
3.630(58)
3.371(24)
3.163(74)
2.9783(74)
2.7231(31)

Type Occurrence of NestolaiteHide

General Appearance of Type Material:
On sandstone matrix as rounded aggregates up to 2 mm across and up to 0.05 mm thick; aggregates consist of flattened to
acicular crystals, up to 30 x 7 µm, with oblique angles
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
Sandstone
Associated Minerals at Type Locality:
Reference:
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014) Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine: 78: 497-505.

Synonyms of NestolaiteHide

Fluorescence of NestolaiteHide

Other InformationHide

Notes:
Raman vibrations [cm-1]: ~825, ~750, ~470, and 410–370 (mostly Se-O stretching); 3400-3200 (OH stretching); 1680 (H-O-H bending);
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 NestolaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Agakhanov, A.A. and Lykova, I.S. (2013) Nestolaite, IMA 2013-074. CNMNC Newsletter No. 18, December 2013, page 3252. Mineralogical Magazine: 77: 3249-3258.
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014) Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine: 78: 497-505.

Internet Links for NestolaiteHide

Localities for NestolaiteHide

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)
 
  • Utah
    • Grand Co.
      • Thompsons District (S. E. Thomsons)
        • Yellow Cat Mesa
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505
          • Parco Mine group
Collected by and in the collection of Brent Thorne. EDS and XRD confirmed.
Mineral and/or Locality  
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