Formula: (Ca, Sr)Mn (Al, Fe)4 [H((Si,P)O4] (PO4)3(OH)4
Origin of name: From Greek attakeos = salmon (colour)
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: possible lamellae are observed in thin section
Unit cell: a = 17.188 Å, b = 11.477 Å, c = 7.322 Å, b = 113.83°
Colour: White to pale red or pink
Diaphaneity: Transparent to translucent
Habit: Massive, granular, indistinctly crystalline
Hardness: 5
Specific gravity: 3.09-3.23
Cleavage: None
Synonyms/varieties:
Comments: Found in an iron deposit
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