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Formula: Mg(C2H3O3)2.2H2O
Organic compound, glycolate subgroup
Crystal System: Monoclinic
Specific gravity: 1.69 measured, 1.682 calculated for the empirical formula
Hardness: 1½
Streak: White
Colour: Colourless
Solubility: Insoluble in water, dissolves slowly in hydrochloric acid
Environments
Plutonic igneous environments
Hydrothermal environments
Stanevansite is a new mineral, approved in 2022 and to date (January 2024) reported only from the type
locality.
Localities
The Type Locality, Western end, Pusch Ridge, Pima County, Arizona, USA, is also the type locality for
lazaraskeite,
jimkrieghite and
lianbinite. Stanevansite occurs in a heavily fractured
leucogranite, 1 to 2 m below the rock surface. Associated
minerals include lazaraskeite,
jimkrieghite,
chrysocolla, malachite,
wulfenite, mimetite,
phosphohedyphane,
cerussite, hematite,
calcite, microcline,
phlogopite and quartz.
Stanevansite is a secondary mineral believed to
have formed through the interaction of fluids containing glycolic acid
(C2H4O3) derived from decaying plant materials or bacterial activities with
magnesium produced by the alteration of primary and
secondary minerals.
Stanevansite occurs as sprays of bladed or prismatic crystals, with individual crystals up to
0.40 x 0.07 x 0.03 mm3
(CJMP 62.1.153-164).
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