Formula: CaFe2(AsO4)2(OH)2
Origin of name: For Terry Maxwell Seward (1940-) who collected the mineral.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 16.461, b = 7.434, c = 12.131
Colour: Dark red, ligher red orange
Diaphaneity: Translucent
Luster: Vitreous
Habit: Platy, anhedral grains, in aggregates
Hardness: 3.5
Specific gravity:
Cleavage: 2: [100] imperfect, [011] imperfect
Tenacity: Splintery fracture
Streak: Reddish brown
Synonyms/varieties:
Comments:
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