Catalog Search Guide
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Titanite
Titanite, widely known in the gem trade as sphene, is a calcium titanium silicate (CaTiSiO5) belonging to the nesosilicate class. Crystallizing in the monoclinic system, it forms distinctive flattened, wedge-shaped crystals with an adamantine to resinous luster that collectors prize alongside its exceptional optical dispersion — often described as exceeding that of diamond, producing a fiery multicolored flash in transparent material. Colors range widely from yellow, brown, and green to the rare chromium-bearing "chrome sphene," an intense emerald-green variety colored by chromium; iron and rare-earth elements are responsible for the more common yellow-brown tones. Beyond its ornamental appeal, titanite is an important petrologic accessory mineral in granites, syenites, and metamorphic schists, and is used by geochronologists as a U-Pb and Th-Pb geochronometer to date metamorphic events.
The mineral's type locality is the graphite mines of Passau, Bavaria, Germany, where it was first described in 1795. Classic Alpine-cleft specimens come from the Tavetsch and Oberalp Pass areas of Switzerland, the Zillertal, Habach and Felben Valleys of the Hohe Tauern in Austria, and the Mont Blanc Massif in France — all yielding the sharp, lustrous crystals that built titanite's reputation among European mineral collectors. Exceptional gem-grade material has since emerged from further afield: the Shigar and Tormiq Valleys and the Skardu area of Gilgit-Baltistan, Pakistan, produce large green-gold, highly transparent crystals; Ankarafa in Madagascar supplies olive-green and gem-quality stones; and Capelinha in Minas Gerais, Brazil, is noted for twinned, gemmy yellowish-green specimens. Other notable sources include Tory Hill in Haliburton County, Ontario, Canada, producing brown and black crystals; the Dodo Mine in Russia's Ural region; Imilchil, Morocco, known for brown crystals on albite matrix; and Mettur, Tamil Nadu, India.
Collectors seek titanite both as sharp, undamaged crystal specimens from classic Alpine and Himalayan localities and as faceted sphene gemstones prized for their unmatched fire. Its association with minerals such as albite, adularia, chlorite, epidote, and quartz in Alpine-type fissures makes fine, well-formed titanite crystals a benchmark for cleft and cavity mineralization, while twinned Brazilian and Pakistani crystals remain highly sought after for their size, color saturation, and gemological clarity.
