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Natrolite (Photo) [abbr. Ntr ]
Year of discovery: 1803 (Hohentwiel, Germany), 1897 (Japan)
Locality list: 122 localities of natrolite
- Na2Al2Si3O10,2H2O
- [Na+2][Al2Si3O10]2-,2H2O
- Color: Colorless, White
- Streak: White
- Luster: Vitreous
- Diaphaneity: Transparent-Translucent
- Cleavage: Perfect on {110} (2 planes), Parting on {010} (1 plane)
- Hardness: 5-5.5
- Density: 2.3
- System: Orthorhombic
- Group: mm2, Fdd2
- Lattice: a=18.3, b=18.6, c=6.6
Etymology: Natro (Soda) in Latin