Nestolaite
A valid IMA mineral species
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About Nestolaite
Fabrizio Nestola
Formula:
CaSeO3 · H2O
Colour:
Light violet
Lustre:
Vitreous
Hardness:
2½
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.
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.
Unique Identifiers
Mindat ID:
45943
Long-form identifier:
mindat:1:1:45943:3
GUID
(UUID V4):
(UUID V4):
e184e7dd-a204-4de0-8e63-84ff75819f20
IMA Classification of Nestolaite
Approved
Approval year:
2013
First published:
2014
Classification of Nestolaite
4.JH.30
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
H : Selenites without additional anions, with H2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ntl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Nestolaite
Vitreous
Transparency:
Transparent
Colour:
Light violet
Streak:
White
Hardness:
2½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100}
Perfect on {100}
Fracture:
Irregular/Uneven
Density:
3.18(2) g/cm3 (Measured) 3.163 g/cm3 (Calculated)
Optical Data of Nestolaite
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.
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
Chemistry of Nestolaite
Mindat Formula:
CaSeO3 · H2O
Elements listed:
Crystallography of Nestolaite
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)°
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.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020621 | Nestolaite | Kasatkin A V, Plasil J, Marty J, Agakhanov A A, 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 | 2014 | Little Eva mine, Grand County, Utah, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.277 Å | (100) |
| 4.949 Å | (37) |
| 3.767 Å | (29) |
| 3.630 Å | (58) |
| 3.371 Å | (24) |
| 3.163 Å | (74) |
| 2.9783 Å | (74) |
| 2.7231 Å | (31) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Nestolaite
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
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 Nestolaite
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Nestolaite associated with Cobaltomenite | CoSeO3 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 4.JH. | Bernardevansite | Al2(SeO3)3 · 6H2O |
| 4.JH.05 | Chalcomenite | CuSeO3 · 2H2O |
| 4.JH.10 | Ahlfeldite | Ni(SeO3) · 2H2O |
| 4.JH.10 | Clinochalcomenite | CuSeO3 · 2H2O |
| 4.JH.10 | Cobaltomenite | CoSeO3 · 2H2O |
| 4.JH.15 | Mandarinoite | Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0) |
| 4.JH.20 | Orlandiite | Pb3(SeO3)(Cl,OH)4 · H2O |
| 4.JH.25 | Larisaite | Na(H3O)(UO2)3(SeO3)O2 · 4H2O |
Fluorescence of Nestolaite
none
Other Information
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.
Internet Links for Nestolaite
mindat.org URL:
https://www.mindat.org/min-45943.html
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References for Nestolaite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 18. Mineralogical Magazine, 77 (8) 3249-3258 doi:10.1180/minmag.2013.077.8.15
Localities for Nestolaite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Kasatkin et al. (2014) +1 other reference |
| Collected by and in the collection of ... |
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Molly Hogan group, Parco Mines, Yellow Cat Mesa, Thompsons Mining District, Grand County, Utah, USA