Stanevansite
A valid IMA mineral species
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About Stanevansite
Formula:
Mg(C2H3O3)2 · 2H2O
Colour:
colourless
Lustre:
Vitreous
Hardness:
1½
Specific Gravity:
1.69
Crystal System:
Monoclinic
Member of:
Type Locality:
The second glycolate mineral discovered. Associated with the first one - lazaraskeite. The third glycolate mineral is jimkrieghite; and the fourth - lianbinite (NH4; more complex).
The Mg analogue of puschridgeite.
The structure is based on mononuclear complexes, [Mg(C2H3O3)2(H2O)2], connected to one another by hydrogen bonds.
The Mg analogue of puschridgeite.
The structure is based on mononuclear complexes, [Mg(C2H3O3)2(H2O)2], connected to one another by hydrogen bonds.
Unique Identifiers
Mindat ID:
470464
Long-form identifier:
mindat:1:1:470464:1
IMA Classification of Stanevansite
Classification of Stanevansite
10.AA.40
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
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 for Standard |
|---|---|---|
| Ses | 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 Stanevansite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
1½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Density:
1.69(2) g/cm3 (Measured) 1.682 g/cm3 (Calculated)
Optical Data of Stanevansite
Type:
Biaxial (+)
RI values:
nα = 1.539(5) nβ = 1.545(5) nγ = 1.558(5)
2V:
Measured: 62° (2), Calculated: 69°
Max. Birefringence:
δ = 0.019
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Chemistry of Stanevansite
Mindat Formula:
Mg(C2H3O3)2 · 2H2O
Element Weights:
Elements listed:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Mg0.95Zn0.05)Σ1.00(C2H3O3)2.2H2O |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Western end, Pusch Ridge, Pima County, Arizona, USA |
Crystallography of Stanevansite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Setting:
P21/c
Cell Parameters:
a = 11.4927(2) Å, b = 5.8547(1) Å, c = 12.4711(2) Å
β = 91.161(1)°
β = 91.161(1)°
Ratio:
a:b:c = 1.963 : 1 : 2.13
Unit Cell V:
838.96 ų (Calculated from Unit Cell)
Z:
4
Twinning:
common on (100).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.47 Å | (62) |
| 5.223 Å | (93) |
| 4.787 Å | (100) |
| 3.819 Å | (73) |
| 3.102 Å | (71) |
| 3.018 Å | (33) |
| 2.580 Å | (20) |
| 2.406 Å | (33) |
Type Occurrence of Stanevansite
General Appearance of Type Material:
occurs as sprays of bladed crystals (up to 0.40 × 0.07 × 0.03 mm).
Place of Conservation of Type Material:
Type material is deposited in the collections of the University of Arizona Alfie Norville Gem & Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue number 22721 (holotype), and the RRUFF Project, deposition number R220011 (cotype)
Associated Minerals at Type Locality:
Synonyms of Stanevansite
Other Language Names for Stanevansite
Dutch:Stanevansiet
German:Stanevansit
Relationship of Stanevansite to other Species
Member of:
Other Members of Glycolate Subgroup:
| Glecklerite | Na(C2H3O3) | Orth. mmm(2/m2/m2/m) : Pbcm |
| Jimkrieghite | Ca(C2H3O3)2 | Orth. mmm(2/m2/m2/m) : Pbca |
| Lazaraskeite | Cu(C2H3O3)2 | Mon. 2/m : P21/c |
| Lianbinite | (NH4)(C2H3O3)(C2H4O3) | Mon. 2/m : P21/c |
| Puschridgeite | Mn(C2H3O3)2(H2O)2 | Mon. 2/m : P21/c |
| Rasmussenite | Ca(C2H3O3)2 · 3H2O | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 3 photos of Stanevansite associated with Lazaraskeite | Cu(C2H3O3)2 |
Related Minerals - Strunz-mindat Grouping
| 10.AA. | Henrysunite | Na2(C2H3O3)2(H2O) |
| 10.AA.05 | Formicaite | Ca(HCOO)2 |
| 10.AA.10 | Dashkovaite | Mg(HCOO)2 · 2H2O |
| 10.AA.20 | Acetamide | CH3CONH2 |
| 10.AA.25 | Calclacite | Ca(CH3COO)Cl · 5H2O |
| 10.AA.30 | Paceite | CaCu(CH3COO)4 · 6H2O |
| 10.AA.35 | Hoganite | Cu(CH3COO)2 · H2O |
| 10.AA.40 | Lianbinite | (NH4)(C2H3O3)(C2H4O3) |
| 10.AA.40 | Domitrovicite | Zn(C2H3O3)2 · 2H2O |
| 10.AA.40 | Puschridgeite | Mn(C2H3O3)2(H2O)2 |
| 10.AA.40 | Lazaraskeite | Cu(C2H3O3)2 |
| 10.AA.40 | Glecklerite | Na(C2H3O3) |
| 10.AA.40 | Jimkrieghite | Ca(C2H3O3)2 |
| 10.AA.40 | Rasmussenite | Ca(C2H3O3)2 · 3H2O |
| 10.AA.45 | Marchettiite | C5H7N5O3 |
Other Information
Notes:
It is insoluble in water, but slowly dissolves in hydrochloric acid.
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 Stanevansite
mindat.org URL:
https://www.mindat.org/min-470464.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Stanevansite
Localities for Stanevansite
Showing 1 localities.
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) | |
| Miyawaki et al. (2022) +2 other references |
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Western end, Pusch Ridge, Pima County, Arizona, USA