| Kyanite |
| SpiritRock Shop |
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| Old Stock Kyanite Blades from North Carolina |
| 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 forming. 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 Carolina |
