Pectolite
Chemical Formula	NaCa2Si3O8(OH)
Species	Silicates
Crystal System	Triclinic
Mohs Scale	4-5
Specific Gravity	2.84-2.90
Color	Colorless, whitish, grayish, yellowish
Streak	White
Luster	Sub-Vitreous, Silky
Refractive Index	n = 1.594 - 1.610 n = 1.603 - 1.614 n = 1.631 - 1.642
Diaphaneity	Transparent, Translucent
Cleavage	Perfecton and
Fracture	Irregular/Uneven
Crystal Habit：Tabular to acicular, radiating fibrous, spheroidal, or columnar; massive
Geological Setting：Primary mineral in nepheline syenites. Hydrothermal mineral in cavities in basalts and diabases. In serpentinites and peridotites.