|Rutilated quartz is a macro crystalline variety of the mineral Quartz. Quartz is the most abundant single mineral on earth.
It makes up about 12% of the earth's crust, occurring in a wide variety of igneous, metamorphic and sedimentary rocks.
Quartz varieties are divided into two groups based on the size of the individual grains or crystals;
macro crystalline is quartz in which individual crystals are easily seen with the naked eye
crypto crystalline is quartz in which the individual crystals are too small to be seen without the use of magnification.
Some of the macro crystalline quartz varieties are: Amethyst, Ametrine, Cat's-eye Quartz, Citrine, Phantom Quartz,
Rock Crystal, Rose Quartz, Rutilated Quartz and Smoky Quartz. Blue Aventurine Quartz and Green Aventurine Quartz
are actually quartzite (a rock, not a mineral) composed essentially of interlocking macro crystalline quartz grains with
grains of other color imparting minerals.
The crypto crystalline varieties of quartz may be separated into two types; fibrous and micro granular. Chalcedony is the
general term applied to the fibrous crypto crystalline varieties. Agate is an example of a fibrous crypto crystalline
banded chalcedony variety of quartz. Carnelian, Chrysoprase and bloodstone are other chalcedony varieties. Chert is
the general term applied to the granular crypto crystalline varieties of quartz, of which flint and Jasper are examples.
Many different minerals can form as inclusions within quartz. One of the most important varieties of included quartz for
gem use is Rutilated quartz. Rutilated quartz usually occurs as Rutilated rock crystal, Rutilated smoky quartz or Rutilated
Rutilated quartz forms in quartz veins, usually with milky quartz bordering the vein with quartz crystals growing in toward
the center, growing around and enveloping the Rutile crystals traversing the vein. Natural radiation can cause Rutilated
crystal to become a brown to gray color, known as Rutilated smoky quartz.
Rutilated quartz is recognized by the Rutile crystals passing through the quartz. Rutile is one of three polymorph's of
Titanium Dioxide; Rutile, Anatase, and Brookite. Rutile is the most common natural form of Titanium Dioxide. Rutile
color is black or reddish brown in large thick crystals or golden yellow or rusty yellow as inclusions or in thin crystals. The
name is from the Latin "rutilus", which means "golden-red". Natural Rutile is important in mineralogy because of its
presence as fine inclusions. It forms prismatic crystals that can be thin as hairs or forming larger needle like crystals in
other minerals. If the needles are very fine, they result in the phenomena known as “Asterism” and “Chatoyancy”. In fact,
microscopic Rutile needles are responsible for the stars (Asterism) in star sapphires.
Rutilated quartz is also known as “Venus hair stone”, “Cupid's darts” and “Fleches d'amour”.
Perfect polished specimens are difficult to obtain due to the hardness difference between Quartz (which is 7 on the
Mohs scale), and Rutile (which is 6 on the Mohs scale). Most Polished Rutilated quartz will have small pits or fractures
due to this characteristic. Recently, manufactured Rutilated quartz, in such forms as spheres, freeforms and pendants,
has been imported to the mineral market. Reputable sellers will always identify where the natural specimen comes from,
or specifically state the item is a manufactured specimen. If you are not sure, ask before buying.
|We were able to obtain some old stock (1960's vintage) rutilated quartz from Brazil. Specimens for
sale are listed on Thumbnail page...they are extremely difficult to work with as the natural
inclusions penetrate the quartz exterior, and the quartz surfaces have small vugs which do not like
to polish out ...but...we are listing some pieces "as is"...
Polished Natural Rutilated
Smoky Quartz Freeform
|Ground and polished from a natural Rutilated quartz crystal unearthed in Diamantina, Minas Gerais, Brazil. This rare quality
XL polished crystal of natural Rutilated quartz has very fine transparency with slender golden rutile crystals “floating” in the
light smoky quartz crystal. There are several natural fractures which produce an amazing reflective pattern within the piece.
This is the nicest piece of Rutilated quartz we have ever found. This specimen was obtained from a Brazilian mine
owner at the 2000 Tucson Show, It is from our Personal Collection and it has 4 clear cabinet bumpers stuck on as feet on
the bottom for desk or glass shelf display (these are easily removable without damaging the piece).
This specimen weighs 32oz or 2 lbs (908g) and measures 5.8 x 5.1 x 2 inches (14.7 x 13 x 5.2cm)
|Rubber bumper feet on this side
Natural Smoky Quartz
Points with Golden Rutile
Inclusions from Brazil
|Natural Rutilated Smoky Quartz crystal points on a large plate from Brazil. This Old Stock rare quality XL plate of Smoky Quartz
points with Golden Rutile inclusions was procured from a mineral dealer who purchased the entire Junior McKinney Gem Shop
(located in Spruce Pine, NC) inventory a few years after Juniors death. Many of Junior McKinney's specimens are on display in
North Carolina Museums. This specimen has beautiful rutile inclusions on this one of a kind Large point plate. There are 10
large points and at least 10 more smaller points. There are chips on most of the points, but this is still an amazing display of
natural smoky rutilated quartz! It is from our Personal Collection and it has been an individual display specimen on a cabinet
top where natural sunlight highlights the golden rutile needles.
Left click photos to see a larger version
This specimen weighs 88.7oz or 5.5 lbs (2.516kg) and measures 8.22 x 6.18 x 2.99 inches (20.8 x 15.6 x 7.6cm)