Formula: (Fe,Mg,Fe)2(PO4)(OH)
Origin of name: for Jack Satterly, Canadian geologist
Crystal system: hexagonal
Crystal class: 32 or 3m or -3 2/m
Twinning:
Unit cell:
Colour: pale yellow to pale brown
Diaphaneity: transparent
Luster: vitreous
Habit: elongated grains, to 2 by 2 by 40 mm, in radiating aggregates
Hardness: 4.5 to 5
Specific gravity: 3.68
Cleavage: none
Tenacity:
Streak: pale brown
Synonyms/varieties:
Comments: dimorphous with wolfeite
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