Analcime
Chemical Formula	NaAlSi2O6·H2O
Species	Silicates
Crystal System	Triclinic
Mohs Scale	5
Specific Gravity	2.24-2.29
Color	White, colorless, gray, pink, greenish, yellowish
Streak	White
Luster	Vitreous
Refractive Index	n = 1.479 - 1.493 n = 1.480 - 1.494
Diaphaneity	Transparent, Translucent
Cleavage	Poor/Indistincton
Fracture	Sub-Conchoidal
Crystal Habit：Typically in crystals, usually trapezohedrons, also massive to granular.
Geological Setting：In the groundmass or vesicles of silica-poor intermediate and mafic igneous rocks, typically basalts and phonolites, from late-stage hydrothermal solutions, or disseminated due to deuteric alteration. In lake beds, altered from pyroclastics or clays, or as a primary precipitate; authigenic in sandstones and siltstones.