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DATOLITE , a See also:mineral See also:species consisting of basic See also:calcium and See also:boron orthosilicate, Ca(BOH)SiO4. It was first observed by J. Esmark in ,8o6, and named by him from Sareia-Bau, " to See also:divide," and ALOoc, " See also:- STONE
- STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
- STONE, CHARLES POMEROY (1824-1887)
- STONE, EDWARD JAMES (1831-1897)
- STONE, FRANK (1800-1859)
- STONE, GEORGE (1708—1764)
- STONE, LUCY [BLACKWELL] (1818-1893)
- STONE, MARCUS (184o— )
- STONE, NICHOLAS (1586-1647)
stone," in allusion to the granular structure of the massive mineral. It usually occurs as well-See also:developed glassy crystals bounded by numerous See also:bright faces, many of which often have a more or less pentagonal outline. The crystals were for a See also:long See also:- TIME (0. Eng. Lima, cf. Icel. timi, Swed. timme, hour, Dan. time; from the root also seen in " tide," properly the time of between the flow and ebb of the sea, cf. O. Eng. getidan, to happen, " even-tide," &c.; it is not directly related to Lat. tempus)
- TIME, MEASUREMENT OF
- TIME, STANDARD
time considered to be orthorhombic, and indeed they approach closely to this See also:system in See also:habit, interfacial angles and See also:optical See also:orientation; humboldtite was the name given by A. See also:Levy in 1823 to See also:monoclinic crystals supposed to be distinct from datolite, but the two were afterwards proved to be identical. The mineral also occurs as masses with a granular to compact texture; when compact the fractured surfaces have the See also:appearance of See also:porcelain. A fibrous variety with a botryoidal or globular See also:surface is known as botryolite. Datolite is 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 or colourless, often with a greenish tinge; it is transparent or opaque. Hardness 5-52; specific gravity 3.0.
Datolite is a mineral of secondary origin, and in its mode of occurrence it resembles the See also:zeolites, being found with them in the amygdaloidal cavities of basic igneous rocks such as See also:basalt; it is also found in See also:gneiss and See also:serpentine, and in metalliferous See also:veins and in beds of See also:iron ore. At See also:Arendal in See also:Norway, the See also:original locality for both the crystallized and botryoidal varieties, it is found in a See also:bed of See also:magnetite. In amygdaloidal basaltic rocks it is found at Bishopton in See also:Renfrewshire and near See also:Edinburgh; and as excellent crystallized specimens at several localities in the See also:United States, e.g. at See also:Westfield in See also:Massachusetts, See also:Bergen and See also:Paterson in New See also:Jersey, and in the See also:copper-See also:mining region of See also:Lake See also:Superior. At St Andreasberg in the Harz it occurs both in See also:diabase and in the veins of See also:silver ore. See also:Fine specimens have recently been obtained from See also:Tasmania.
Large crystals of datolite completely altered to See also:chalcedony were formerly found with magnetite in the Haytor iron mine on See also:Dartmoor in See also:Devonshire ; to these pseudomorphs the name haytorite has been applied. (L. J.
End of Article: DATOLITE
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