Caminite

Formula:  Mg₇(SO₄)₅(OH)₄ ^. H₂O

Origin of name:  Form Latin for chimney (locality)

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell:

Colour:  Colourless

Diaphaneity:

Luster:

Habit:  Crystals <10 µm, rare grains to 500 µm

Hardness:  2.5

Specific gravity:  2.58 to 2.79

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Colour may be actually white