Metahaiweeite

Formula: Ca(UO₂)₂Si₆O₁₅ ^. nH₂O (n < 5)

Origin of name:  From Greek meta - after and haiweeite

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

Colour:  Pale yellow to greenish yellow

Diaphaneity:  Translucent

Luster:  Pearly

Habit:  Flake-like grains; spherical aggregates, radial structure

Hardness:  3.5

Specific gravity:  3.35

Cleavage:  1; {100} distinct

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Fluoresces weak dull green