Margarite
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Margarite is a calcium rich member of the mica group of the phyllosilicates with formula: CaAl₂O₁₀(OH)₂. It forms white to pinkish or yellowish gray masses or thin laminae. It crystallizes in the monoclinic crystal system. It typically has a... Wikipedia
Cleavage: basal
Color: flesh pink
Crystal class: Domatic (m); (same H-M symbol)
Crystal habit: platy
Crystal system: Monoclinic
Formula (repeating unit): CaAl2(Al2Si2)O10(OH)2
Mohs scale hardness: 4