WILLEMITE
This article appears in Volume V28, Page 658 of the Encyclopedia Britannica.
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Encyclopedia Britannica - Main :: WAT-WIL
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WILLEMITE , a mineral consisting of zinc orthosilicate, Zn2SiO4, crystallizing in the parallel-faced hemihedral class of the rhombohedral system . Crystals have the form of hexagonal prisms terminated by rhombohedral planes: there are distinct cleavages parallel to the prism-faces and to the base. Granular and cleavage masses are of more common occurrence. The colour varies considerably, being colourless, white See Also: - WHITE
- WHITE, ANDREW DICKSON (1832– )
- WHITE,
GILBERT See Also: - GILBERT
- GILBERT (KINGSMILL) ISLANDS
- GILBERT (or GYLBERDE), WILLIAM (1544-1603)
- GILBERT, ALFRED (1854– )
- GILBERT, ANN (1821-1904)
- GILBERT, GROVE KARL (1843– )
- GILBERT, J
- GILBERT, JOHN (1810-1889)
- GILBERT, MARIE DOLORES ELIZA ROSANNA [" LOLA MONTEZ "] (1818-1861)
- GILBERT, NICOLAS JOSEPH LAURENT (1751–1780)
- GILBERT, SIR HUMPHREY (c. 1539-1583)
- GILBERT, SIR JOSEPH HENRY (1817-1901)
- GILBERT, SIR WILLIAM SCHWENK (1836– )
(1720–1793) - WHITE, HENRY KIRKE (1785-1806)
- WHITE, HUGH LAWSON (1773-1840)
- WHITE, JOSEPH BLANCO (1775-1841)
- WHITE,
RICHARD GRANT (1822-1885) - WHITE, ROBERT (1645-1704)
- WHITE, SIR GEORGE STUART (1835– )
- WHITE, SIR THOMAS (1492-1567)
- WHITE, SIR WILLIAM ARTHUR (1824--1891)
- WHITE, SIR WILLIAM HENRY (1845– )
- WHITE, THOMAS (1628-1698)
- WHITE, THOMAS (c. 1550-1624)
, greenish-yellow, apple-green, flesh-red, &c. The hardness is 52, and the specific gravity 3.9-4.2. A variety containing much manganese replacing zinc is called " t:roostite." Willemite occurs at Sterling Hill, Sussex county, and Franklin Furnace in New Jersey , where it is associated with other zinc ores (franklinite and zincite) in crystalline limestone. It has been found at only a few other localities, one of which is near Liege, and for this reason the mineral was named after William I. of the Nether-lands. Under the influence of. radium radiations, willemite fluoresces with a brilliant green colour. (L. J. S.)
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