BRUCITE  , a See also:

• MINERAL

mineral consisting of See also:

• MAGNESIUM [symbol Mg, atomic weight 24.32 (0 = 16)]

magnesium hydroxide, Mg(OH)2, and crystallizing in the See also:

• RHOMBOHEDRAL

rhombohedral See also:

• SYSTEM

system . It was first described in 1814 as " native See also:

• MAGNESIA

magnesia from New See also:

• JERSEY
• JERSEY, EARLS OF

Jersey by A . See also:

• BRUCE
• BRUCE, ALEXANDER BALMAIN (1831-1899)
• BRUCE, JAMES (1930-1794)
• BRUCE, MICHAEL (1746-1767)

Bruce, an See also:

• AMERICAN

American mineralogist, after whom the See also:

• SPECIES

species was named by F . S . See also:

• BEUDANT, FRANCOIS SULPICE (1787—1850)

Beudant in 1824; the same name had, however, been earlier applied to the mineral now known as chondrodite . Brucite is usually found as platy masses, some-times of considerable See also:

• SIZE

size, which have a perfect cleavage parallel to the See also:

• SURFACE

surface of the plates . It 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, sometimes with a tinge of See also:

• GREY, CHARLES GREY, 2ND EARL (1764-1845)
• GREY, HENRY GREY, 3RD EARL (1802-1894)
• GREY, LADY JANE (1537-1554)
• GREY, SIR EDWARD
• GREY, SIR GEORGE (1812–1898)

grey, See also:

• BLUE (common in different forms to most European languages)

blue or See also:

• GREEN, A
• GREEN, ALEXANDER HENRY (1832—1896)
• GREEN, DUFF (1791—1875)
• GREEN, JOHN RICHARD (1837—1883)
• GREEN, MATTHEW (1696-1737)
• GREEN, THOMAS HILL (1836-1882)
• GREEN, VALENTINE (1739–1813)
• GREEN, WILLIAM HENRY (.1825–1900)

green, varies from transparent to translucent, and on the cleavage surfaces has a pronounced pearly lustre . In See also:

• GENERAL
• GENERAL (Lat. generalis, of or relating to a genus, kind or class)

general See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance and softness (H= 2Z) it is thus not unlike See also:

• GYPSUM

gypsum or See also:

• TALC

talc, but it may be readily distinguished from these by its See also:

• OPTICAL

optical See also:

• CHARACTER (Gr. xapareri7p, from xap&crew, to scratch)

character, being uniaxial with See also:

• POSITIVE (or PORTABLE) ORGAN

positive birefringence, whilst gypsum is biaxial and talc has negative birefringence . The specific gravity is 2.38–2.40 . In the variety known as nemalite the structure is finely fibrous and the lustre silky: this variety contains 5 to 8 % of ferrous See also:

• OXIDE

oxide replacing magnesia, and has consequently a rather higher specific gravity, viz . 2.45 . Another variety, manganbrucite, has the magnesia partly replaced by manganous oxide (14 %), and thus forms a passage to the isomorphous mineral pyrochroite, Mn(OH)2 .

Brucite is generally associated with other magnesian minerals, such as See also:

• MAGNESITE

magnesite and See also:

• DOLOMITE

dolomite, and is commonly found in See also:

• SERPENTINE

serpentine, or sometimes as small scales in phyllites and crystal-See also:

• LINE

line See also:

• SCHISTS (Gr. vxq'ecv, to split)

schists; it has also been observed in metamorphosed magnesian See also:

• LIMESTONE

limestone, such as the See also:

• ROCK
• ROCK (O.Fr. rake, Sp. rota, Ital. rocca; possibly from a Lat. form rupica, from rupes, rock)
• ROCK, DANIEL (1799–187t)

rock known as predazzite from Predazzo in See also:

• TIROL (or TYROL 1)

Tirol . The best crystals and foliated masses are from See also:

• TEXAS

Texas in See also:

• PENNSYLVANIA
• PENNSYLVANIA, UNIVERSITY OF

Pennsylvania, U.S.A., and from Swinaness in Unst, one of the See also:

• SHETLAND, or ZETLAND

Shetland Isles, Nemalite is from See also:

• HOBOKEN

Hoboken, New Jersey, and from See also:

• AFGHANISTAN

Afghanistan . At all these localities the mineral forms See also:

• VEINS

veins in serpentine . (L . J .