Blue Quartz: crystal - with Riebeckite

This is a natural crystal of clear and milky quartz that has a pinnacle crystal crammed / covered with deep blue-grey fibrous minerals - probably riebeckite - running through it. The termination is not intact, but the interior of the crystal is very interesting, and this remains a nice example of its type.
Size: 5.25 x 2 x 1.5 cm