blue tourmaline
1Tourmaline — Schorl Tourmaline General Category Cyclosilicate Chemical formula (Ca,K,Na,[ …
2Tourmaline — Tour ma*line, n. [F. tourmaline, cf. It. turmalina, tormalina, NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon.] (Min.) A mineral occurring usually in three sided or six sided prisms terminated by rhombohedral… …
3tourmaline — tourmalinic /toor meuh lin ik/, adj. /toor meuh lin, leen /, n. any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems. Also,… …
4tourmaline — /ˈtɔməlin/ (say tawmuhleen) noun a mineral, essentially a complex silicate containing boron, aluminium, sodium, lithium, magnesium and iron, occurring in various colours (black being common); the transparent varieties (red, pink, green and blue)… …
5tourmaline — n. kind of black, blue, red and green silicate cut as gem …
6paraiba tourmaline — noun A bright, gemstone with blue to green tones …
7Brazilian sapphire — blue tourmaline …
8indicolite — n. (Min.) Indigolite, blue tourmaline, blue shorl …
9indigolite — n. (Min.) Indicolite, blue tourmaline, blue shorl …
10Quartz-porphyry — Quartz porphyry, in petrology, is the name given to a group of hemi crystalline acid rocks containing porphyritic crystals of quartz in a fine grained matrix, usually of micro crystalline or felsitic structure. In specimens, the quartz appears as …
