Carbonate-cyanotrichite

Formula:  Cu₄Al₂(CO₃,SO₄)(OH)₁₂ ^. 2H₂O

Origin of name:  From carbonate and cyanotrichite

Crystal system:  Orthorhombic

Crystal class:  Unknown

Twinning:

Unit cell:

Colour:  Pale blue to brilliant greenish blue to azure blue

Diaphaneity:

Luster:  Silky

Habit:  Crystals acicular in rosettes; fibrous aggregates; elongated platelets

Hardness:  ~ 2

Specific gravity:  2.65 to 2.67

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Carbonate analogue of cyanotrichite