Formula: (Fe,Mg)Fe(UO2,PO4)4.12-13H2O
Origin of name: for Renaud F. C. Vochten (1933-), mineraloigst, State University of Antwerp, Antwerp, Belgium.
Crystal system: Monoclinic
Crystal class: unknown
Twinning:
Unit cell: a = 12.606, b = 19.99, c = 9.99, β = 102.52°
Colour: Bronze-brown
Diaphaneity: Opaque, translucent in thin fragments
Luster: Adamantine-metallic, bronzy
Habit: Subparallel crystals 0.5 to 1 mm in aggregates, as crystals with squarish outline
Hardness: 2.5
Specific gravity: 3.65
Cleavage: 1; {010} prominent
Tenacity: Brittle, irregular fracture
Streak: Light brown
Synonyms/varieties:
Comments: soluble in 1:1 HCl, radioactive
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