Included Quartz is called scenic or garden quartz. The various types of Included Quartz are numerous.
Perhaps enough for a web site of their own. We certainly
don't have all of them. But we do have a nice little
variety. Even a new one from Brazil, called Leolite. At
least that's it's name for now. The cutter is naming it
after him self. Our supplier says he is the only dealer in the US at this
point in time. All in all these very interesting mixes give
rise to a variety of lapidary, jewelry and specimen use.
Inclusions of other minerals in clear or smoky quartz are
not particularly uncommon and are often very attractive. Many minerals have
crystals of other minerals, air, water, tar, petroleum,
rocks and in the case of amber even animals included in
their interiors. Included quartz is found world wide. But
major sources for these types of gem materials are located
in Brazil and Africa.
can be generalized in two categories. The first type are called early formed.This type begins when one crystal was
growing and another mineral begins to make a small crystal
on the surface of the earlier mineral. The first mineral
continues to grow and may grow over and around the second
mineral, thereby enclosing it. Examples ofthis type of inclusion, include tourmaline, rutile, actinolite, hedenbergite, hematite, and several others.
The second type includes chlorite, cookeite, hematite, lepidocrocite,mica, pyrite, galena, adularia, and
many others. This type of
inclusion involves minerals that formed during initial crystallization and is a result of exsolution. This
process is favorable at certain temperatures and pressures, while unstable at other temperatures and pressures. The minerals will then
try and convert to a more stable chemistry. This often leads to undesirable minerals being
good example of this is rutilated quartz. The rutile is
thought to have been in solid solution in the quartz and upon cooling, the
rutile was forced out of the quartz structure. Resulting in microscopic highly oriented needles. Rutile inclusions often are responsible for
the effects of asterism and chatoyancy. Another good example
is Dendritic Quartz and Agate. The agate variety is also, often called Moss Agate. This type of
included quartzis due to various type of oxides that are
present in the quartz crystal. Which form interesting tree
or moss like inclusions.
Less well known varieties of included
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.
Some very rare minerals are only known as small inclusions
in other minerals. Sometims inclusions even turn out to be
other gemstone minerals. Inclusions of air and water are
called two phase inclusions and are commonly found in gypsum
and quartz. Identification of inclusions may be difficult.
Often only visual test are able to be performed on an
including crystal, without removing it. Although some
gemstones, contain inclusions that make them identifiable.
Emeralds mined in Russia for instance, are known to have tiny inclusions of
actinolite, unlike other emeralds. There are also optic
tests that can be performed. Usually a reliable analysis can