Formula: Pb8Al4Si8(SO4)2(CO3)4(OH)8O20
Origin of name: For F. Kegel, German mining executive, Namibia
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white
Diaphaneity: Translucent to transparent
Luster: Pearly
Habit: Pseudohexagonal plates to 0.3 mm in spherical aggregates and compact masses
Hardness:
Specific gravity: 4.5
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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