These rutile crystals are in the form of inclusions in quartz crystals from Bahia, Brazil. Rutile is an oxide that contains the elements Ti,O and quartz is a silicate containing the elements Si and O. Rutile is a common accessory mineral in quartz crystal deposits. In this case the rutile was incorporated or included into the quartz crystals as they formed. The rutile crystals resemble silk-like golden fibers that shine through the translucent quartz. This piece is a large miniature that measures 2 1/8 x 1 1/2 x 1 inches or 60 x 38 x 24 mm.