Catalog Search Guide
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Kyanite
Kyanite is an aluminum silicate (Al2SiO3O5) belonging to the same chemical family as andalusite and sillimanite, but distinguished by its striking blade-like crystal habit and its strongly anisotropic hardness — a single crystal can measure roughly 4.5 along its length and 6.5-7 across it, a diagnostic property well known to collectors and gemologists. Its name derives from the Greek "kyanos", meaning deep blue, and it typically forms in aluminum-rich schists, gneisses, and eclogites under regional metamorphism, making it a classic petrological indicator mineral for pressure-temperature conditions. Colors range from the celebrated cornflower and sapphire-like blues to green, gray, black, and the rare chromium-bearing orange variety.
Brazil is the world's premier source of specimen-grade kyanite: the state of Minas Gerais yields exceptional material, with deep blue crystals in large sizes from Barra do Salinas, interconnected crystal groups from São José da Safira in the Doce valley, and dark gray sprays from Ribeirão das Folhas near Minas Novas. Gemmy crystals showing a dramatic blue central vein come from Vitória da Conquista in Bahia. Nepal has produced transparent, sapphire-like blue kyanite since the mid-1990s, notably from the Kali Gandaki Gorge in Mustang District and the Daha and Sankhuwasabha areas, often in dramatic quartz-mica schist matrix. Classic European localities include Pizzo Forno and the type locality Monte Campione in Ticino, Switzerland, where bladed blue crystals occur with staurolite and paragonite, while Russia's Southern Urals furnish fine blue-green crystals up to 15 cm from Borisovskie Sopki near Plast. Norway's Nordland region hosts numerous kyanite-bearing quartzites around Fauske, Narvik, and Mo i Rana, and additional historic European occurrences are recorded in the Czech Republic's Šumava and Vysočina regions. Kenya and Tanzania contribute gem-transparent blue material, and Tanzania is notable for rare chrome-bearing orange kyanite prized by specialist collectors.
Kyanite has long been valued for its intense color, elegant bladed habit, and occasional color-zoned or bicolor crystals, making it equally attractive to mineral collectors, faceters, and metaphysical crystal enthusiasts. Fine specimens often display kyanite in association with quartz, mica, staurolite, and paragonite, and top-grade Brazilian and Nepalese material regularly commands premium prices for its clarity and saturation. Beyond collecting, kyanite's refractory properties make it industrially important in porcelain, spark plugs, and high-temperature ceramics, with major industrial deposits mined in the United States (Georgia, North Carolina, Virginia) and India — though it is the aesthetic, well-formed crystals from Brazil, Nepal, and the Alps that define kyanite as a true collector's mineral.
