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| '''Elbaite''', a sodium, lithium, aluminium borosilicate, is a ] species belonging to the ] group. Elbaite forms three series, with ], with ], and with ]. Due to these series specimens with the ideal end-member formula are not found occurring natually. | '''Elbaite''', a sodium, lithium, aluminium borosilicate, is a ] species belonging to the ] group. Elbaite forms three series, with ], with ], and with ]. Due to these series specimens with the ideal end-member formula are not found occurring natually. | ||
| As a gemstone, elbaite is reckoned to be one of the most desirable of the Tourmaline group because of the variety and depth of its colours and quality of the crystals. Originally discovered on the Island of ], Italy in ] it has since been found in many parts of the world. In ] a major locality was discovered in Canada, at ] in the ]. | As a gemstone, elbaite is reckoned to be one of the most desirable of the Tourmaline group because of the variety and depth of its colours and quality of the crystals. Originally discovered on the Island of ], Italy in ] it has since been found in many parts of the world. In ] a major locality was discovered in Canada, at ] in the ]. | ||
| Some of the pale pink and green prisms are tipped with black, and have consequently been called "nigger-heads".<ref>http://www.1911encyclopedia.org/Tourmaline</ref> | |||
| {{Commonscat|Elbaite}} | {{Commonscat|Elbaite}} | ||
Revision as of 14:43, 11 July 2007
| Elbaite | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | Na(LiAl)3Al6Si6O18(BO3)3(OH)4 |
| Crystal system | Trigonal |
| Identification | |
| Formula mass | 916.68 gm |
| Color | Green, red to pink, blue, orange, yellow, colorless, multicolored |
| Crystal habit | Prismatic; striated |
| Cleavage | Poor/Indistinct on {1120} and {1011} |
| Fracture | Sub Conchoidal |
| Mohs scale hardness | 7½ |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to opaque |
| Density | 2.9 - 3.2 |
| Major varieties | |
| Achroite | colorless |
| Indicolite | blue |
| Rubellite | red to pink |
| Verdelite | green |
Elbaite, a sodium, lithium, aluminium borosilicate, is a mineral species belonging to the Tourmaline group. Elbaite forms three series, with Dravite, with Liddicoatite, and with Schorl. Due to these series specimens with the ideal end-member formula are not found occurring natually.
As a gemstone, elbaite is reckoned to be one of the most desirable of the Tourmaline group because of the variety and depth of its colours and quality of the crystals. Originally discovered on the Island of Elba, Italy in 1913 it has since been found in many parts of the world. In 1994 a major locality was discovered in Canada, at O'Grady Lakes in the Yukon.
Some of the pale pink and green prisms are tipped with black, and have consequently been called "nigger-heads".
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