332 - Natrolite

ID	332
Mineral	Natrolite
Location	Wiesenbad - Saxen - Germany
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Natrolite information at mindat.org

ID	2947
Long ID	1:1:2947:2
Formula	`Na₂(Si₃Al₂)O₁₀ · 2H₂O`
IMA Status	0 1
Other Occurrences	Cavities in amygdaloidal basalts
Discovery Year	1803
Diapheny	Transparent,Translucent
Cleavage	on {110}
Tenacity	brittle
Colour	White, colorless, red, yellow, brown, green, bluish
Hardness (min)	5.0
Hardness (max)	5.5
About the name	Named in 1803 by Martin H. Klaproth from the Greek natron, "soda," in allusion to its sodium content and lithos, "stone." Not to be confused with natrolite (of William Hyde Wollaston) in 1812 for a soda-bearing scapolite.
Streak	White
Crystal System	Orthorhombic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven
Morphology	Crystals short to long prismatic. From hairlike up to 1 meter in length and 10 cm wide. Common forms: {110}, {100}, {010}, {111}, {101}, {331}, {551} Other forms: {001}, {610}, {310}, {740}, {590}, {120}, {301}, {601}, {031}, {221}, {511}, {311}, {131}, {391} and more.
Twinning	On {110}, {011}, {031}.
UV	Commonly orange to yellow.
Thermal Behaviour	In a closed tube, becomes white and opaque. Before the blowpipe, fuses at 2, quietly, to a clear glass.
shortcode_ima	Ntr
Group	Natrolite Subgroup

Natrolite