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Formula: MoO3.H2O
Hydrated oxide of molybdenum,
paramorph of
virgilluethite
Crystal System: Triclinic
Specific gravity: 3.44 measured, 3.41 calculated
Hardness: 1½
Colour: Colourless
Solubility: Insoluble in water or hydrochloric acid
Environments
Sedimentary environments
Hydrothermal environments
Raydemarkite is a new mineral, approved in 2022.
Localities
At the type locality, the Summit group, Cookes Peak Mining District, Luna County, New Mexico, USA, raydemarkite
occurs as sprays of acicular or prismatic crystals on a matrix consisting mainly of
quartz and pyrite. Individual crystals
are up to 1.00 x 0.10 x 0.06 mm3 in size. Associated minerals include
sidwillite, ilsemannite,
jordisite, powellite,
anhydrite, gypsum,
bouškaite, pyrite and
quartz.
Raydemarkite is colourless in transmitted light and transparent with a white streak and vitreous lustre.
Twinning is common
(CJMP 61.203-213).
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