This awesome chunk of Scottish rock has mixed minerals in a beautiful display. There are the large, square looking calcite crystals and there is a blanket of quartz drusy that sparkles as you turn it. 
The host rock could be dolomite. It has mixed minerals as well, including quartz and potentially limestone. 
This Scottish crystals came from near the Southern Uplands way in Dumfries and Galloway. It has been in the personal collection for about three years now. It's time to send it home.