Stanevansite (original) (raw)

A valid IMA mineral species

Formula:

Mg(C2H3O3)2 · 2H2O

Crystal System:

Monoclinic

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:470464:1

63b9d49f-33d4-424d-9816-c609735dd41c

IMA Classification of StanevansiteHide

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Approval history:

IMA 2022-085

Classification of StanevansiteHide

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10.AA.

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of StanevansiteHide

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Density:

1.69(2) g/cm3 (Measured) 1.682 g/cm3 (Calculated)

Optical Data of StanevansiteHide

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RI values:

_n_α = 1.539(5) _n_β = 1.545(5) _n_γ = 1.558(5)

2V:

Measured: 62° (2), Calculated: 69°

δ = 0.019

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of StanevansiteHide

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Mindat Formula:

Mg(C2H3O3)2 · 2H2O

Chemical AnalysisHide

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Empirical formulas:

Sample references:

Crystallography of StanevansiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 11.4927(2) Å, b = 5.8547(1) Å, c = 12.4711(2) Å
β = 91.161(1)°

Ratio:

a:b:c = 1.963 : 1 : 2.13

Unit Cell V:

838.96 ų (Calculated from Unit Cell)

Twinning:

common on (100).

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Type Occurrence of StanevansiteHide

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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 StanevansiteHide

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Relationship of Stanevansite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 StanevansiteHide

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References for StanevansiteHide

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Reference List:

Yang, Hexiong, Gu, Xiangping, Lazar, Warren, Gibbs, Ronald B., Downs, Robert T. (2024) Stanevansite, Mg(C2H3O3)2·2H2O, a New Hydrous Glycolate Mineral, From The Santa Catalina Mountains, Tucson, Arizona, USA. The Canadian Journal of Mineralogy and Petrology, 62 (1) 153-164 doi:10.3749/2300047

Localities for StanevansiteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.