Gilalite

Formula:  Cu₅Si₆O₁₇ ^. 7H₂O

Origin of name:  After locality; Christmas mine, Gils Co., Arizona

Crystal system:  Monoclinic

Crystal class:  Unknown

Twinning:

Unit cell: a = 13.38 Ǻ, b = 19.16 Ǻ, c = 9.03 Ǻ, β = 90.0°

Colour:  Green to pale blue-green

Diaphaneity:

Luster:  Non-metallic

Habit:  Fibres, radiating forming spherules

Hardness:  2

Specific gravity:  2.82

Cleavage:  none

Tenacity:  Waxy or gummy

Streak:

Synonyms/varieties:

Comments: