Formula: Ca9(Mg,Fe)H(PO4)7
Origin of name: for Herbert Percy Whitlock (1868-1948), Curator of Minerals, American Museum of Natural History, New York, NY, U.S.A.
Crystal system: Trigonal
Crystal class: 3m
Twinning:
Unit cell: a = 10.33, c = 37.103
Colour: Colourless, white, gray, yellowish, pinkish
Diaphaneity: Transparent to translucent
Luster: Vitreous to resinous
Habit: Crystals rhombohedral, rarely tabular, massive, coarse granular to earthy, pistolitic
Hardness: 5
Specific gravity: 3.13
Cleavage: None
Tenacity: Subconchoidal to uneven fracture, brittle
Streak: White
Synonyms/varieties: merrillite
Comments:
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