LABRADORITE

A VARIETY OF PLAGIOCLASE FELDSPAR THAT HAS A GREYISH BACKGROUND WITH FLASHES OF COLOUR CALLED LABRADORESCENCE. IT IS USED AS WATCH DIALS. LABRADORITE HAS A HARDNESS OF 6 TO 6.5 AND A SPECIFIC GRAVITY OF 2.70. FINNISH LABRADORITE IS ALSO KNOWN AS SPECTROLITE.