Formula: Sr3Na2Zr(CO3)6.3H2O
Origin of name: for Sir William Edmond Logan (1798-1875), first director of the Geological Survey of Canada (1842-1870).
Crystal system: Triclinic, pseudohexagonal
Crystal class: 1
Twinning:
Unit cell: a = 8.90 Å, b = 8.90 Å, c = 6.73 Å, a = 102.8°, b = 116.4°, g = 60.0°
Colour: Lemon-yellow to amber, white, thin fragments colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals with terminations roughly pyramidal, with flat pedion, roughly hexagonal in outline, striated and grooved, massive
Hardness: 3.5
Specific gravity: 3.22
Cleavage: 1; {0001} perfect
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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