Formula: Hg6Cl3O(OH)
Origin of name: For T. Egleston, American mineralogist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Brownish-yellow to orange-yellow, yellow, dark brown to black
Diaphaneity: Translucent
Luster: Bright adamantine to resinous
Habit: Crystals dodecahedral, striated parallel to edges, cubic or octahedral; massive; hairlike
Hardness: 2.5
Specific gravity: 8.33
Cleavage: None
Tenacity:
Streak: Yellowish, rapidly tarnishes
Synonyms/varieties:
Comments: Series with kadyrelite; photosensitive becomes dark brown to black in light
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