|Old Stock Kyanite Blades from
|Kyanite forms bladed crystals. It is generally blue, but can also be green or gray. It has a glassy luster. Kyanite has a
unique physical feature in that it has two different hardnesses. When its hardness is measured across the crystal, it is 7;
when it is measured down the length of the crystal, it is 5. All other minerals have a single hardness no matter where it is
measured on the crystal.
Kyanite is the variant spelling of the original name of this mineral, Cyanite. The name was derived from the Greek word
kyanos meaning blue in reference to this mineral’s most common color. The name was given by Abraham Gottlob
Werner in 1789.
Sillmanite was named in honor of Professor Benjamin Silliman (1779-1864) who was the first professor of mineralogy
at Yale University (as well as professor of chemistry for a time). The name was given by G.T. Bowen in 1824.
Andalusite was named after Andalusia, a province in southern Spain, where this mineral is found. The name was given
by Jean Claude Delametherie in 1798.
There are substantial deposits of Kyanite in the United States. The most important deposits are in Idaho and the
Appalachian Mountain region in Eastern United States. Gneisses in Southern California also have significant Kyanite
resources. Presently, however, it is not economical to mine these deposits. Should economic conditions change, these
deposits may be worth mining. South Africa supplies most of the Andalusite imported for industrial consumption in the
United States. France and India also produce Andalusite and Kyanite, respectively. The most recent finds of Kyanite
have come from Brazil
Kyanite and its related minerals are used to make a variety of refractory materials. Refractory materials are those that
are resistant to very high temperatures. As a result, more than half of the Kyanite consumed is used in refractories for
the production of steel. Kyanite is also used to produce refractories for nonferrous (non-iron-bearing) metals. Some is
consumed to make refractories for glass and heat-resistant ceramics. Kyanite is also used to make spark plugs and is
used for non-refractory applications.
|A very nice specimen of natural Kyanite
Blades just as they are mined. Platy crystals
of blue kyanite formed in a matrix of what
appears to be a white plagioclase feldspar,
possibly albite, and quartz. The blue color
varies in intensity throughout. The kyanite
crystal is segmented with thin quartz filling
between segments like it was interrupted after
crystallization and reformed as the crystal was
This large specimen weighs 19.4 oz or
1.21 lbs (550g) and measures 6.2 x 3 x 1.9
inches (15.9 x 7.6 x 4.8 cm)
|A very nice display of stunning natural multiple shades of gemmy blue
Kyanite crystallized blades on quartz, feldspar and mica pegmatite
matrix from North Carolina. This piece makes a beautiful shelf, desk or
large cabinet display!
This specimen weighs 11.6 oz or 0.72 lbs (329g)
and measures 4.7 x 3.1 x 1.4 inches (12 x 7.9 x 3.6 cm)
|Old Stock Kyanite Specimen
from North Carolina
|An interesting specimen of Kyanite in a matrix of quartz, feldspar,
biotite and lots of mica in pegmatite from North Carolina. This piece is
truly an in demand North Carolina specimen !
This specimen weighs 10.5 oz or 0.65 lbs (299g)
and measures 3.9 x 2.5 x 1.9 inches (10 x 6.3 x 4.8 cm)
|Old Stock Rare Kyanite and Mica
Specimen from North Carolina
|A rare specimen with a single, clear with a deep blue stripe, Kyanite
plate in a matrix of quartz, feldspar and black schorl tourmaline
pegmatite from North Carolina. This piece is a rare and highly in
demand North Carolina specimen ! You will look a long time to find
another specimen like this one!
This specimen weighs 5.2 oz or 0.32 lbs (147g)
and measures 3.1 x 2.6 x 1 inches (8 x 6.7 x 2.7 cm)
the Kyanite measures 1.1 x 0.54 inches (28 x 13.9 mm)
|Old Stock Rare Clear and Deep
Blue Kyanite Blade in Quartz,
Feldspar and Black Schorl
Tourmaline Matrix from North