Agrinierite

Formula:  (K₂,Ca,Sr)U₃O₁₀.4H₂O

Origin of name:  for Henri Agrinier (1928-1971), French engineer, Mineralogy Laboratory of the French Atomic Energy Commission, Paris, France

Crystal system:  Orthorhombic, pseudo-hexagonal

Crystal class:  2/m 2/m 2/m, mm2 or 222

Twinning:  on  composition plane {110}, sector twinning

Unit cell:  a = 14.04 Å, b = 24.07 Å, c = 14.13 Å

Colour:  Orange

Diaphaneity: Transparant to translucent

Luster: Resinous, greasy

Habit:  Crystals tabular with pseudo-hexagonal section

Hardness:

Specific gravity:  5.7

Cleavage:  1; {001} good

Tenacity:

Streak:

Synonyms/varieties:

Comments: Found in the oxidation zone of a uranium deposit.