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Clintonite (Photo) [abbr. Cln ]
Year of discovery: 1843 (Amity, USA), 1930 (Japan)
Locality list: 12 localities of clintonite
- CaAlMg2(Al3Si)O10(OH)2
- [Ca2+][Al3+][Mg2+2][(OH)2|Al3SiO10]9-
- Color: Colorless, Pale green, Reddish brown
- Streak: White
- Luster: Pearly
- Diaphaneity: Transparent-Translucent
- Habit: Hexagonal platy
- Aggregate: Radial
- Cleavage: Perfect on {001} (1 plane)
- Hardness: 4-5
- Density: 3.1
- System: Monoclinic (1M, 2M1), Triclinic (3A) (Layer-stacking polytype)
- Group: 2/m, C2/m
- Lattice: a=5.2, b=9.0, c=9.8, β=100.4
Synonym: Xanthophyllite