Rauvite

Formula: Ca(UO₂)₂V₁₀O₂₈.16H₂O

Origin of name: combination of symbols for the elements; Ra (implying radium but not present in rauvite), U and V

Crystal system: unknown

Crystal class: unknown

Twinning:

Unit cell: 

Colour: purplish black, bluish black to brownish red, dirty orange-yellow

Diaphaneity: 

Luster: adamantine to waxy

Habit: dense masses, fine-grained, slickensided, botryoidal crusts, films, interstitial filling in sandstone

Hardness: 

Specific gravity: 2.92

Cleavage: none

Tenacity: 

Streak: yellowish brown to olive

Synonyms/varieties:

Comments: