Formula: (Pb,Ca)2-3(CO3)1.5-2(OH, F)0.5-1[(Fe,Al)2Si4O10(OH)2] . nH2O
Origin of name: From ferric iron (Fe3+) and surite
Crystal system: Monoclinic
Crystal class: 2 or 2/m
Twinning:
Unit cell: a = 5.241 Ǻ, b = 9.076 Ǻ, c = 16.23 Ǻ, β = 90.03°
Colour: Forest-green, yellow-green
Diaphaneity: Transparent
Luster: Silky
Habit: Fibers in compact radial aggregates, tapering feathery crystals to 2 mm in radial groups
Hardness: 2 to 2.5
Specific gravity: 4.0
Cleavage: 1 Perfect
Tenacity:
Streak: Greenish yellow to olive-green
Synonyms/varieties:
Comments: Fe3+ analogue of surite
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