Sengierite

Formula: Cu₂(UO₂)₂V₂O₈.6H₂O

Origin of name: for E. Sengler, Katangan mining official

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 10.62 Å, b = 8.10 Å, c = 10.11 Å, b = 103.6°

Colour: green to yellow green

Diaphaneity: 

Luster: vitreous to adamantine

Habit: crystals thin plates, pseudohexagonal outline, to 2 mm, coatings

Hardness: 2.5

Specific gravity: 4.05

Cleavage: 1; {001} perfect

Tenacity: brittle

Streak: 

Synonyms/varieties:

Comments: