Specific gravity: 2.8 calculated
Hardness: 1 to 2
Colour: Very light yellow to pale grenish yellow, colourless to pale yellow in transmitted light
Solubility: Soluble in water
Metarossite is a secondary mineral resulting from the
dehydration of rossite (Mindat).
At the type locality, the Arrowhead tunnel, Bull Pen Canyon, San Miguel County, Colorado, USA, metarossite forms small yellow veins in a light grey and friable carnotite-bearing sandstone; it is coarse, platy in habit, but soft and friable. Occasionally within the centre of masses of metarossite one can find small glassy kernels of rossite. Associated minerals include rossite, carnotite and gypsum (Proceedings of the U.S. National Museum: 72: 1-12, HOM).
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