double terminated smoky quartz

The distinctive dark colour of smoky quartz comes from free silicone deposits inside. Depth and consistency of the crystal  While traditional quartz has a clear or whitish cloudy colour; smoky quartz has a grey colour. Some types of smoky quartz are quite clear, while others are almost opaque, and some pieces are nearly black.this is a double terminated crystal with a barnacle crystal growing off the side 
size 70mm long by 35mm dia