Sphene
基本資料
| 化學式 | CaTiSiO5 |
|---|---|
| IMA 代號 | Ttn |
| 施特龍茨分類 | 9.AG |
| 晶系 | 單斜晶系 |
| 點群 | 2/m |
| 模式產地 | (synonym for titanite), Switzerland |
Sphene (titanite)
Sphene — titanite in modern nomenclature — is a calcium titanium silicate named for its distinctive wedge-shaped crystals (Greek sphenos, wedge). Its claim to fame is optical: dispersion higher than diamond's, giving cut stones and even rough crystal faces an exceptional colored fire. Typical colors run yellow-green to brown; gem-grade material is prized despite modest hardness (5–5.5).