Kegginite

kegginite

ansermtite

sherwoodite

mesaite

Images

Formula: Pb₃Ca₃[AsV₁₂O₄₀(VO)].20H₂O
Arsenovanadate (containing the polyoxymetalate cluster [As⁵⁺V⁵⁺₁₂O₄₀(VO)]^12-)
Crystal System: Trigonal
Specific gravity: 2.69 calculated
Hardness: 2
Streak: Pinkish orange
Colour: Orange-red
Luminescence: Not fluorescent under UV
Solubility: Insoluble in water and soluble at room temperature in dilute hydrochloric acid
Environments

Hydrothermal environments

Kegginite is a relatively new mineral, approved in 2016 and to date (June 2023) reported only from the type locality.

Localities

At the type locality, the Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA, kegginite is a secondary mineral found on asphaltum (bitumen) in a montroseite- and corvusite- bearing sandstone. Other secondary minerals found in close association with kegginite are ansermetite, gypsum, mesaite and sherwoodite. Crystals of kegginite are orange-red simple hexagonal tablets (AM 102.2.461-465).

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