LIMBURGITE  , in See also:

• PETROLOGY

petrology, a dark-coloured volcanic 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 resembling See also:

• BASALT

basalt in See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance, but containing normally no See also:

• FELSPAR, or FELDSPAR

felspar . The name is taken from See also:

• LIMBURG
• LIMBURG, or LIMEOURG

Limburg (See also:

• GERMANY
• GERMANY (Ger. Deutschland)

Germany), where they occur in the well-known rock of the Kaiserstuhi . They consist essentially of See also:

• OLIVINE

olivine and See also:

• AUGITE

augite with a brownish glassy ground See also:

• MASS (O.E. maesse; Fr. messe; Ger. Messe; Ital. messa; from eccl. Lat. missa)
• MASS, IN

mass . The augite may be 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, but more commonly is 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)

brown or See also:

• VIOLET

violet; the olivine is usually See also:

• PALE (through Fr. pal, from Lat. palms, a stake, for paglus, from the stem pag- of pangere, to fix; " pole " is from the same original source)

pale green or colourless, but is sometimes yellow (hyalosiderite) . In the ground mass a second See also:

• GENERATION (from Lat. generare, to beget, procreate; genus, stock, race)

generation of small eumorphic augites frequently occurs; more rarely olivine is See also:

• PRESENT

present also as an ingredient of the See also:

• MATRIX

matrix . The See also:

• PRINCIPAL

principal See also:

• ACCESSORY

accessory minerals are titaniferous See also:

• IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron oxides and See also:

• APATITE

apatite . Felspar though sometimes present is never abundant, and See also:

• NEPHELINE

nepheline also is unusual . In some limburgites large phenocysts of dark brown See also:

• HORNBLENDE

hornblende and See also:

• BIOTITE

biotite are found, mostly with irregular See also:

• BORDERS, THE

borders blackened by resorption; in others there are large crystals of soda See also:

• ORTHOCLASE

orthoclase or anorthoclase . Hauyne is an ingredient of some of the limburgites of the Cape Verde Islands.• Rocks of this See also:

• GROUP

group occur in considerable See also:

• NUMBERS, BOOK OF
• NUMBERS, PARTITION OF

numbers in Germany (See also:

• RHINE (Lat. Rhenus, Ger. Rhein, Fr. Rhin, Dutch Rhyn, or Rijn)

Rhine See also:

• DISTRICT

district) and in Bohemia, also in See also:

• SCOTLAND
• SCOTLAND, CHURCH OF
• SCOTLAND, EPISCOPAL CHURCH OF

Scotland, See also:

• AUVERGNE

Auvergne, See also:

• SPAIN
• SPAIN (Espana)

Spain, See also:

• AFRICA
• AFRICA, ROMAN

Africa (See also:

• KILIMANJARO

Kilimanjaro), See also:

• BRAZIL
• BRAZIL, or BRASIL

Brazil, &c . They are associated principally with basalts, nepheline and See also:

• LEUCITE

leucite basalts and monchiquites . From the last-named rocks the limburgites are not easily separated as the two classes See also:

• BEAR
• BEAR, BLACK
• BEAR, BROWN
• BEAR, GRIZZLY
• BEAR, ISABELLINE
• BEAR, WHITE

bear a very See also:

• CLOSE
• CLOSE (from Lat. clausum, shut)
• CLOSE, MAXWELL HENRY (1822-1903)

close resemblance in structure and in See also:

• MINERAL

mineral See also:

• COMPOSITION
• COMPOSITION (Lat. compositio, from componere, to put together)

composition, though many authorities believe that the ground mass of the monchiquites is not a See also:

• GLASS
• GLASS (O.E. glees, cf. Ger. Glas, perhaps derived from an old Teutonic root gla-, a variant of glo-, having the general sense of shining, cf. " glare," " glow ")
• GLASS, STAINED

glass but crystalline See also:

• ANALCITE

analcite . Limburgites may occur as flows, as sills or dykes, and are sometimes highly vesicular .

Closely allied to them are the augitites, which are distinguished only by the See also:

• ABSENCE (Lat. absentia)

absence of olivine; examples are known from Bohemia, Auvergne, the See also:

• CANARY
• CANARY (Serinus canarius)

Canary Islands, See also:

• IRELAND
• IRELAND, CHURCH
• IRELAND, CHURCH OF
• IRELAND, JOHN (1761-1842)
• IRELAND, JOHN (1838- )
• IRELAND, WILLIAM HENRY (1777-1835)

Ireland, &c .