ANKERITE
Online Encyclopedia
Originally appearing in Volume
V02,
Page 58
of the 1911 Encyclopedia Britannica.
ANKERITE
, a member of the mineral group of rhombohedral carbonates
.
In composition it is closely related to dolomite, but differs from this in having magnesia replaced by varying amounts of ferrous and manganous oxides, the general formula being Ca(Mg,Fe,Mn) ( COs)2
.
Normal ankerite is Cat MgFe(COa)4
.
The crystallographic and physical characters resemble those of dolomite and chalybite
.
The angle between the perfect rhombohedral cleavages is 730 48', the hardness 31 to 4, and the specific gravity 2.9 to 3.1; but these will vary slightly with the chemical composition
.
The colour 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)
, grey or reddish
.
Ankerite occurs with chalybite in deposits of iron-ore
.
It is one of the minerals of the dolomite-chalybite series, to which the terms See also: - BROWN
- BROWN, CHARLES BROCKDEN (1771-181o)
- BROWN, FORD MADOX (1821-1893)
- BROWN, FRANCIS (1849- )
- BROWN, GEORGE (1818-188o)
- BROWN, HENRY KIRKE (1814-1886)
- BROWN, JACOB (1775–1828)
- BROWN, JOHN (1715–1766)
- BROWN, JOHN (1722-1787)
- BROWN, JOHN (1735–1788)
- BROWN, JOHN (1784–1858)
- BROWN, JOHN (1800-1859)
- BROWN, JOHN (1810—1882)
- BROWN, JOHN GEORGE (1831— )
- BROWN, ROBERT (1773-1858)
- BROWN, SAMUEL MORISON (1817—1856)
- BROWN, SIR GEORGE (1790-1865)
- BROWN, SIR JOHN (1816-1896)
- BROWN, SIR WILLIAM, BART
- BROWN, THOMAS (1663-1704)
- BROWN, THOMAS (1778-1820)
- BROWN, THOMAS EDWARD (1830-1897)
- BROWN, WILLIAM LAURENCE (1755–1830)
-spar, pearl-spar and bitter-spar are loosely applied
.
It was first recognized as a distinct species by W. von Haidinger in 1825, and named by him after M
.
J
.
Anker of Styria
.
(L J
.
End of Article: ANKERITE
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