Dozyite

Formula:   Mg₇Al₂Si₄Al₂O₁₅(OH)₁₂

Origin of name:   For Jean-Jacques Dozy, Dutch geologist

Crystal system:   Monoclinic

Crystal class:   m

Twinning:

Unit cell: 

Colour:   Colourless

Diaphaneity:

Luster:   Pearly iridescent

Habit:   Crystals to 2 mm as wedges and platelets

Hardness:   2.5

Specific gravity:   2.66

Cleavage:   None

Tenacity: 

Streak:   White

Synonyms/varieties:

Comments:   A 1:1 regular interstratification of serpentine (amesite) and chlorite (clinochlore)