Feynmanite

feynmanite

chinleite-(Y)

plasilite

shumwayite

Images

Formula: Na(UO2)(SO4)(OH).3.5H2O
Uranyl sulphate
Specific gravity: 3.324
Hardness: 2
Streak: White
Colour: Pale greenish yellow
Luminescence: Fluoresces bright greenish white under a 405 nm laser
Solubility: Dissolves very slowly in water at room temperature and immediately in dilute hydrochloric acid
Environments

Sedimentary environments
Hydrothermal environments

Feynmanite is a relatively new mineral, approved in 2017 and to date (July 2022) reported only from the type localities. Crystals are very prone to dehydration, forming plášilite.

Localities

There are two co-type localities, the Blue Lizard Mine and the Markey Mine, both in the Red Canyon Mining District, San Juan County, Utah, USA.

At the Blue Lizard Mine, feynmanite occurs as a pale greenish yellow secondary phase on pyrite-rich bitumen in association with chinleite-(Y), gypsum, goethite, natrojarosite, natrozippeite, plášilite and shumwayite. The feynmanite forms thin needles or blades to 0.1 mm in length, and the crystals grow in random “jackstraw” aggregates (MM 83.2.153-160).

At the Markey Mine, feynmanite occurs as a pale greenish yellow secondary phase on pyrite-rich bitumen in association with chinleite-(Y), gypsum, natrojarosite, natrozippeite, plášilite and wetherillite. The feynmanite forms thin needles or blades to 0.1 mm in length, and the crystals grow in random “jackstraw” aggregates (MM 83.2.153-160).

Back to Minerals