Mohs hardness: 7
Refractive index: 1.544-1.553
Critical angle: 40°
Specific gravity: 2.63-2.65
Fracture: Conchoidal, brittle.
Dispersion: Medium (.013)
Kyanite Gemstone Information
About Kyanite - History and Introduction
Kyanite is a gemstone quality aluminum silicate sometimes referred to as disthene, rhaeticite or cyanite. Its name is derived from the Greek word 'kuanos' or 'kyanos', which means 'deep blue', alluding to its typical blue color. However, in addition to blue, kyanite can also be colorless, white, gray, green, orange or yellow. With kyanite, color is typically not consistent throughout. In fact, most stones exhibit areas of light to dark color zones, along with white streaks or blotches. Kyanite is a polymorph of both andalusite and sillimanite. Polymorph gemstones share similar chemical compositions, but they exhibit different crystal structures. Kyanite forms as triclinic crystals, while andalusite and sillimanite are both orthorhombic.
Kyanite's most distinctive trait is its strong anisotropic properties. Most gems are anisotropic to some extent, but kyanite is the most famous of anisotropic gemstones. Anisotropic gemstones exhibit varying properties, depending on their crystallographic direction. When kyanite is cut parallel to its long axis, its hardness can range from 4 to 4.5 on the Mohs scale, but when cut perpendicularly, its hardness can range from 6 to 7.
The high vibration and rapid transfers of energy from Kyanite create pathways where none existed before. Like a universal bridge, it is an extraordinary crystal of connection, opening the mind centers, enhancing telepathic and psychic abilities, bridging gaps in all communication efforts, and providing a link for transmitting or receiving healing energy. It immediately aligns the chakras and subtle bodies, bringing tranquility and a calming effect to the whole being. It is an exceptional stone for transitioning into deep meditative states.
Like Citrine, Kyanite is one of the two minerals on the planet that neither accumulates nor retains negative energy, and therefore never needs cleansing. Kyanite's energy is unlimited in application, making it an excellent stone for metaphysical purposes, and it may be used for cleansing and clearing other crystals.
Kyanite is an aluminum silicate mineral, often occurring as long, striated bladed crystals that may be transparent or translucent with a pearly sheen. The most common colors in metaphysical use are blue streaked with white, indigo, green, and black, though Kyanite may occur in white, gray, pink, yellow, and most recently discovered orange. Kyanite comes from the Greek work, kuanos or kyanos, meaning "deep blue," and was once commonly called Disthene, which means "two strengths." It is also known as Rhaeticide and Cyanite. Its most identifiable feature is its anisotropism, the ability to cleave perfectly in two directions with two distinctly different hardnesses on the perpendicular axes.
Kyanite is valuable in the industrial world for heat resistance, used in high refractory porcelain, refractory bricks, mortars, kiln furniture and foundry molds, in the auto and railroad industries for brake shoes, grinding wheels and cutting disks, and in the standard porcelain of dentures, sinks and bathroom fixtures. Kyanite crystals that are highly transparent and attractive in color can be cut into cabochon and faceted gemstones, and are considered to be "exotic" gems