Coalingite

Formula:  Mg₁₀Fe₂(CO₃)(OH)₂₄ ^. 2H₂O

Origin of name:  Locality; Coalinga, California

Crystal system:  Hexagonal

Crystal class:  -3 2/m

Twinning:

Unit cell:

Colour:  Red-brown, pale brownish, straw colour

Diaphaneity:

Luster:  Resinous

Habit:  Microscopic platelets, aggregates, fibres

Hardness:  1 to 2

Specific gravity:  2.33 to 2.42

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Hardness approximate