Formula: Hg4Al(PO4)2-x(OH)1+3x (x=0.26)
Origin of name: For Arthur E. Smith Jr. (b.1935), American petroleum geologist and mineral collector, who originally found the material
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 17.022 Å, b = 9.074 Å, c = 7.015 Å, β = 101.2°
Colour: Colourless, white
Diaphaneity: Transparent to translucent
Luster: Adamtine, vitreous
Habit: Fibrous - Crystals made up of fibers., Acicular - Occurs as needle-like crystals.
Hardness:
Specific gravity: 6.37
Cleavage: None
Tenacity: Irregular/uneven fracture
Streak: Off white to cream
Synonyms/varieties:
Comments: IMA approved 2002. Secondary mineral derived from cinnabar in the Jackfork Sandstone member of the Stanley Formation (Pennsylvanian Age).
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