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Encyclopedia Britannica - Main :: VAN-VIR |
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VESUVIANITE , a rock
mineral
position. It is a basic calcium and aluminium silicate con- aining small amounts of iron, magnesium, water, fluorine, etc., and sometimes boron ; the ap-proximate formula
crystallizes in the tetragonal system, but often exhibits optical anomalies, and the optical sign varies from positive to negative. Well-devel- oped crystals are of frequent occurrence. They usually have the form of four- or eight-sided prisms terminated by the basal planes (c) and pyramid-planes (p in fig.); the prism-planes are vertically striated and the basal planes smooth and bright . Crystals aretransparent to translucent, vitreous in lustre and vary in colour from brown to green; a sky-blue variety, called cyprine, owes its colour to the presence of a trace of copper. The specific gravity is 3.4 and the hardness 62. The name vesuvianite was given by A. G. Werner in 1795, because fine crystals of the mineral
Vesuvius
Vesuvianite is typically a mineral of contact-metamorphic origin, occurring most frequently in crystalline limestones at their contact with igneous rock
diopside
Vesuvius
district
appearance , has been used as an ornamental stone. (L. J. S.) ,End of Article: VESUVIANITE If you wish, you can link directly to this article.
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