Rutiles
A titanium dioxide mineral with needle-like inclusions (or foreign matter) within a stone. The rutile needles can be reddish (which is what rutile means in Latin).
Rutiles: Needle-like inclusions within a stone, which can produce such gem phenomena as an asterism (or star) and a cat's-eye, depending on the direction of the rutiles.
Other interesting finds were some new rutiles from Kipushi, in southern D.R.
rutilated (adj) containing rutiles.
rutilated quartz (n) quartz which contains rutile inclusions. Such rutiles often take the appearance of thin gold or brown needles.
In these pieces a six sided, shiny black hematite crystal serves as an alignment point for the rutiles which, in the best examples, line up in parallel bundles along each face forming a six rayed star with a hematite center.
If the quantities of rutiles are small, "Asterism" is visible in only a small area. These gems are not recognized as phenomenal gems .The clarity of these gems can be improve by dissolving some rutile needles with heat treatment.
 See also: Gemstone, Inclusion, Inclusions, Stone, Rutile
  
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