Stichtite

Formula: Mg₆Cr₂(OH)₁₆(CO₃).4H₂O

Origin of name: for R. Sticht, Australian mining manager

Crystal system: hexagonal

Crystal class: -3 2/m

Twinning:

Unit cell: 

Colour: bright lilac to rose pink

Diaphaneity: translucent to transparent (thin flakes)

Luster: pearly, waxy, greasy

Habit: micaceous scales, massive, foliated, lamellar, fibrous

Hardness: 1.5 to 2

Specific gravity: 2.16

Cleavage: 1; {0001} perfect

Tenacity: 

Streak: white to pale lilac

Synonyms/varieties:

Comments: member of the hydrotalcite group, dimorphous with barbertonite, feel greasy