Scapolite

Also: Wernerite.
An isomorphous series between the endmembers Marialite and Meionite.

Scapolite shop

Name: from Greek skapos = rod and lithos = stone
Scapolite crystals are long and slender "rod-like" prisms

Can be confused with: Due to similar colour and optical data Scapolite is easy to confuse with quartz.

Localities: Tanzania, Madagascar, Burma, China, Brazil, Canada, USA
numerous other localities of little commercial value.

Handling: Scapolite is heat-sensitive – handle whith care during soldering
Perfect cleavage – handle very carefully during setting.

Interesting facts: By far the most common colour is yellow. Purple Scapolite and pink Scapolite cat´s eye are much rarer and sought after by collectors.

Skapolith aus TansaniaSkapolith aus Tansaniavioletter skapolith purple scapolite
Two yellow and a purple Scapolite from Tanzania

Skapolith Katzenauge aus Sri LankaSkapolith Katzenauge aus Sri Lanka
Two grey Scapolite cat´s eyes from Sri Lanka

Scapolite shop

Gemmological Properties of Scapolite

Formula:
3NaAlSi3O8·NaCl - 3CaAl2Si2O8·CaCO3
Crystal system:
tetragonal
Mohs hardness:
5.5-6
Specific gravity:
2.56-2.77
Refractive index:
doubly refractive, R.I. may vary from 1.522-1-534 to 1,571-1,607
Max. Birefringence:
varies from 0,004 to 0,020
Pleochroism:
none
Luminiscence:
yellow: purple-bluish red, pink: orange-red
Lustre:
vitreous
Cleavage:
perfect, prismatic
Fracture:
conchoidal
Colour:
yellow (most common), purple, pink, colourless