Fiedlerite

Formula:  Pb₃Cl₄F(OH) ^. H₂O

Origin of name:   For Carl Fiedler, Commissioner of Mines, Saxony

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:  Common on {100}

Unit cell: a = 16.62 Ǻ, b = 8.02 Ǻ, c = 7.20 Ǻ, β = 102.2°

Colour:  Colourless, white

Diaphaneity:

Luster:  Adamantine

Habit:  Crystals lath-like, small

Hardness:  ~ 3.5

Specific gravity:  5.88

Cleavage:  1; {100} good

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Data are for fiedlerite-2M; there is also a -1A polytype