Curite

Formula:  Pb₂U₅O₁₇ ^. 4H₂O

Origin of name:  For Pierre Curie, French physicist

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell: a = 12.50 Å, b = 13.01 Å, c = 8.40 Å

Colour:  Reddish-brown  to deep yellow, deep orange-red

Diaphaneity:

Luster:  Adamantine

Habit:  Crystals long prismatic to acicular, elongated along c axis; massive opaline crusts

Hardness:  4 to 5

Specific gravity:  7.40

Cleavage:  1; {100}

Tenacity:  Brittle

Streak:

Synonyms/varieties:

Comments: