Fire Quartz is a member of the quartz family of crystals that forms with a light pink hue. In it's natural state it appears quite opaque, but when it is polished and tumbled it's inclusions become more vibrant giving it a more translucent look. It sits at a 7 on the Mohs scale of Hardness.
Quartz in general is a great energizer and healer, and all stones in the Quartz Family are associated with healing. Fire Quartz in particular is said to bring unique clarity and understanding to the emotions as it is considered a stabilizing crystal.