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The Mineral Rutilated Quartz
VARIETY OF: Quartz , SiO 2 , Silicon
Dioxide.
CRYSTAL SYSTEM: Hexagonal-Rhombohedral
COLOR: Clear to Smoke
USES: Gemstone and ornamental stone.
REFRACTIVE INDEX : 1.544-1.553
HARDNESS: 7
CLASS: tectosilicate
CLEAVAGE: none
FRACTURE: conchoidal
LUSTER: vitreous
STREAK: white
PLEOCHROISM: weak to distinct
SPECIFIC GRAVITY: 2.65
TRANSPARENCY: Good specimens are transparent
PHYSICAL PROPERTIES:
Rutile or titanium oxide (TiO2) is a mineral that typically forms in
long thin needles. Rutilated Quartz is a variety of Quartz Crystal containing
impurities of Titanium Dioxide. Most varieties of transparent quartz,
are valued most when they lack inclusions. But Rutilated quartz is transparent
rock crystal with golden or red needles of rutile trapped inside, that
create beautiful diverse patterns. Some have called it Venus’ Hair Stone.
It is mostly used as a cabochon in jewelry and sometimes in carvings.
Rutile forms prismatic or needle like crystals (tetragonal system),
most commonly red-brown
in color, streak is pale brown, luster is adamantine to metallic, Widespread
in small amounts, rutile occurs in intermediate basic igneous rocks as
a high-temperature accessory mineral, in gneiss and schist, and in high-temperature
veins and pegmatite dikes. Because it is highly resistant to chemical
and physical weathering, it is common in placer deposits.
Lesser well known varieties of included Quartz, that form similar to rutilated
quartz, are Tourmalited Quartz. Which has black or dark green Tourmaline
crystals, Actinolite or Grass Quartz. Which exhibits bright green actinolite
crystals, that really look like grass and Dendritic Quartz. Which has
brown to black iron dendrites, that appear to be plants or ferns growing
inside the stone.
A highly sought after variety of Rutilated Quarts is Star Rutile. Star
Rutile forms when Hemitite is present in the quartz. The titanium oxide
crystals will radiate from the center of the Hemitite in a star like pattern.
The crystal picture on this page is an example of an even more rare smoky
Star Rutile.
Rutile is known to cause the stars in ruby and sapphire, and will also
form in topaz and tourmaline, Today, the vast majority of Rutilated Quartz
is mined in Brazil, but it is found in most of the major gem producing
nations.
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