Formula: K2Fe2+Fe3+Si8O20(OH)4
Origin of name: Named from its composition (Fe2+) and the French 'celadon,' sea-green, in allusion to its common colour
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.27, b = 9.106, c = 10.125, β = 100.266°
Colour: Dark bluish green
Diaphaneity: Earthy, dull
Luster: Translucent to opaque
Habit: Microscopic crystals
Hardness: 2-2.5
Specific gravity: 3.05
Cleavage: [001] perfect
Tenacity: Clay-like fractures
Streak: Pale green
Synonyms/varieties:
Comments:
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