Asisite

Formula:  Pb₇SiO₈Cl₂

Origin of name:  After Asis Farm, Otavi, Namibia, location of the Kombat mine, whihc in the Nama language means drinking place

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell: a = 3.897 Å, c = 22.81 Å

Colour:  Yellow to greenish yellow

Diaphaneity: Transparent

Luster:  Adamantine

Habit:  0.5 mm platy crystals

Hardness:  3.5

Specific gravity:  8.04 (calculated)

Cleavage:  1; {001} perfect

Tenacity:

Streak:  White to light yellow

Synonyms/varieties:

Comments: Found in manganese silicate lenses nearby a sulphide ore body