Cyanotrichite

Formula:  Cu4Al2(SO4)(OH)12 . 2H2O

Origin of name:  From Greek for blue and hair

 

Crystal system:  Orthorhombic

Crystal class:  Unknown

Twinning:

Unit cell: a = 10.16 Å, b = 12.61 Å, c = 2.90 Å

 

Colour:  Pale sky-blue to azure blue

Diaphaneity:

Luster:  Silky

Habit:  Crystals acicular, minute, in velvety coatings and aggregates; tufts and radial-fibrous veinlets

Hardness:

Specific gravity:  2.74 to 2.95

Cleavage:  None

Tenacity:

Streak:  Pale blue

 

Synonyms/varieties:  Lettsomite, namaqualite

 

Comments:

 

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