Lepidocrocite
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Lepidocrocite, also called esmeraldite or hydrohematite, is an iron oxide-hydroxide mineral. Lepidocrocite has an orthorhombic crystal structure, a hardness of 5, specific gravity of 4, a submetallic luster and a yellow-brown streak. It is red to... Wikipedia
Birefringence: δ = 0.570
Color: Ruby-red to reddish brown; light reddish to red-orange in transmitted light; gray-white in reflected light
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal habit: Flattened scales aggregated into plumose groups and rosettes; massive, bladed to fibrous or micaceous
Crystal system: Orthorhombic
Formula (repeating unit): γ-FeO(OH)
Optical properties: Biaxial (−)
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