Formula: Fe4(PO4)3(OH)3.5H2O
Origin of name: after locality Tintic Standard mine, Tintic District, Utah, USA
Crystal system: Monoclinic
Crystal class: 2/m, m, or 2
Twinning:
Unit cell: a = 13.65, b = 6.542, c = 12.31, β = 91.2(1)
Colour: Creamy white with yellowish or brownish tint, may be bright ocher-yellow
Diaphaneity: Translucent
Luster: Dull
Habit: Massive, dense porcelaneous to earthy, or platy crystals in veinlets and nodules to 5 cm
Hardness: about 2.5
Specific gravity: about 2.8-2.94
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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