This quartz crystal containing amphibole is from Minas Gerais, Brazil. Minas Gerais contains hundreds of quartz crystal locations and mines that produce a variety of quartz and quartz crystals containing inclusions of many secondary minerals including amphibole. Amphibole is a group of silicates containing a wide variety of mineral species. This crystal is opaque to transparent and it contains inclusions of yellow to red amphibole crystals. It measures 2 x 1 1/16 x 11/16 inches or 50 x 27 x 18 mm.