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AMBLYGONITE , a See also:mineral usually found as cleavable or., columnar, and compact masses; it is translucent and has a vitreous lustre, and the See also:colour varies from See also:- WHITE
- WHITE, ANDREW DICKSON (1832– )
- WHITE, GILBERT (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)
white to See also:pale shades of See also:violet, See also:grey, See also:green or yellow. There are See also:good cleavages in two directions. The hardness is 6 and the specific gravity 3'o. The mineral is thus not unlike See also:felspar in See also:general See also:appearance, but
See also:AMBLYPODA 795
it is readily distinguished from this by its chemical characters, being an See also:aluminium and See also:lithium fluophosphate, Li(AlF) PO4, with See also:part of the lithium replaced by See also:sodium and part of the See also:fluorine by hydroxyl. Crystals, which are rarely distinctly See also:developed, belong to the anorthic See also:system, and frequently show twin lamellae.
The mineral was first discovered in See also:Saxony by A. Breithaupt in 1817, and named by him from the See also:Greek aft£3Xvs, See also:blunt, and ywvia, See also:angle, because of the obtuse angle between the cleavages. Later it was found at Montebras, dep. See also:Creuse, See also:France, and at See also:Hebron in See also:Maine; and on See also:account of slight See also:differences in See also:optical See also:character and chemical See also:composition the names montebrasite and hebronite have been applied to the mineral from these localities. Recently it has been discovered in considerable quantity at Pala in See also:San Diego See also:county, See also:California, and at See also:Caceres in See also:Spain. Amblygonite occurs with See also:lepidolite, See also:tourmaline and other lithia-bearing minerals in See also:pegmatite-See also:veins. It contains about 10 % of lithia, and, since 1886, has been utilized as a source of lithium salts, the See also:chief commercial See also:sources being the Montebras deposits, and later the Californian. (L. J.
End of Article: AMBLYGONITE
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