how to facet
gemstone main cabochon creation
min data

Mineral: quartz
Gem: quartz with rutile
Cut: cabochons
Origin: Brazil
General Info: The name is derived from the German "quarz" of uncertain origin. It was called "krystallos" by the Greeks, but this later became the generic term for crystal.
Additional Information
Quartz with rutile inclusions is not that uncommon, but nicely transparent quartz not over-run with rutile is a premium material. The rutile (titanium dioxide) crystals can be silver, yellow, golden, straw color, or even nearly black.

In most of the stones, the titanium dioxide (rutile) grew first in a cavity, and was later surrounded by the growing quartz crystal. In some cases the rutile seems to have been "up-rooted" from its growing surface and has become completely suspended in the quartz.

The most highly prized materials contain hematite which grew first, followed by rutile growth (and here's the important key) ... the rutile grew bounded by the hexagonal shape of the hematite forming 6 rayed rutile stars. This entire mass was then incorporated in the quartz. I have no example of this type of material in quartz, but the last image shows the rutile in a star type pattern without the quartz.

Sample of rutilated quartz can be made into attractive doublets using a colored material at the back. The transparent quartz lets the color show through and contrasts with the rutile. See the last cabochon on the page with the Lapis backing.

Closeup of rutile terminating inside of quartz, and floating rutile segment. Bundle of rutile crystals some cut off at boundary of cabochon surface.
Bent rutile crystal. Black hematite crystal often found in association with rutile.

Another popular way to finish a quartz containing rutile cabochon is to cut a doublet using a secondary mineral as the backing. In this case a piece of Lapis was used to make a nice contrast between the blue back, and golden color of the crystals.
Black hematite crystal often found in association with rutile.
Hematite and rutile growth in star pattern but not in quartz.