This is a really neat find! it is light blue in color by the light of day but under a common poster (LongwaveUltra-Violet(LUV)) light, in a scapolite matrix with some minor mica content, polished on one side. This stuff is in limited supply so get it while you can.
It measures 3.5″ by 2″ by 1.5 wedge shaped, weighs in at a eight ounces. so shipping should be in between $12.50!! for locals within North America.