Stanevansite
A valid IMA mineral species
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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 to date. Associated with the first one - lazaraskeite. The third glycolate mineral is jimkrieghite; and the fourth - lianbinite (NH4; more complex).
The structure is based on mononuclear complexes, [Mg(C2H3O3)2(H2O)2], connected to one another by hydrogen bonds.
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
GUID
(UUID V4):
(UUID V4):
63b9d49f-33d4-424d-9816-c609735dd41c
IMA Classification of Stanevansite
Approved
Approval history:
IMA 2022-085
Classification of Stanevansite
10.AA.
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 |
|---|---|---|
| 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
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:
Low
Chemistry of Stanevansite
Mindat Formula:
Mg(C2H3O3)2 · 2H2O
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/b
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
Relationship of Stanevansite to other Species
Member of:
Other Members of this group:
| Glecklerite | Na(C2H3O3) | Orth. mmm (2/m 2/m 2/m) : Pbcm |
| Jimkrieghite | Ca(C2H3O3)2 | Orth. mmm (2/m 2/m 2/m) : Pbca |
| Lazaraskeite | Cu(C2H3O3)2 | Mon. 2/m : P21/m |
| Lianbinite | (NH4)(C2H3O3)(C2H4O3) | Mon. 2/m : P21/b |
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Stanevansite associated with Lazaraskeite | Cu(C2H3O3)2 |
Related Minerals - Strunz-mindat Grouping
| 10.AA. | Jimkrieghite | Ca(C2H3O3)2 |
| 10.AA. | Lianbinite | (NH4)(C2H3O3)(C2H4O3) |
| 10.AA. | Glecklerite | Na(C2H3O3) |
| 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 | Lazaraskeite | Cu(C2H3O3)2 |
| 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
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Please feel free to link to this page.
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References for Stanevansite
Reference List:
forum.amiminerals.it (2022) http://forum.amiminerals.it/viewtopic.php?f=5&t=18310&sid=3a8c1744e1d422d7f57fa70d6da3240f
Localities for Stanevansite
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) |
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