| slovo | definícia |
feldspar
(encz) | feldspar,živec n: Zdeněk Brož |
Feldspar
(gcide) | Feldspar \Feld"spar`\, Feldspath \Feld"spath`\, n. [G.
feldspath; feld field + spath spar.] (Min.)
A name given to a group of minerals, closely related in
crystalline form, and all silicates of alumina with either
potash, soda, lime, or, in one case, baryta. They occur in
crystals and crystalline masses, vitreous in luster, and
breaking rather easily in two directions at right angles to
each other, or nearly so. The colors are usually white or
nearly white, flesh-red, bluish, or greenish.
[1913 Webster]
Note: The group includes the monoclinic (orthoclastic)
species orthoclase or common potash feldspar, and the
rare hyalophane or baryta feldspar; also the triclinic
species (called in general plagioclase) microcline,
like orthoclase a potash feldspar; anorthite or lime
feldspar; albite or soda feldspar; also intermediate
between the last two species, labradorite, andesine,
oligoclase, containing both lime and soda in varying
amounts. The feldspars are essential constituents of
nearly all crystalline rocks, as granite, gneiss, mica,
slate, most kinds of basalt and trachyte, etc. The
decomposition of feldspar has yielded a large part of
the clay of the soil, also the mineral kaolin, an
essential material in the making of fine pottery.
Common feldspar is itself largely used for the same
purpose. Feldspathic |
feldspar
(wn) | feldspar
n 1: any of a group of hard crystalline minerals that consist of
aluminum silicates of potassium or sodium or calcium or
barium [syn: feldspar, felspar] |
| | podobné slovo | definícia |
white feldspar
(encz) | white feldspar, n: |
Aventurine feldspar
(gcide) | Aventurine \A*ven"tu*rine\, n. [F. aventurine: cf. It.
avventurino.]
1. A kind of glass, containing gold-colored spangles. It was
produced in the first place by the accidental (par
aventure) dropping of some brass filings into a pot of
melted glass.
[1913 Webster]
2. (Min.) A variety of translucent quartz, spangled
throughout with scales of yellow mica.
[1913 Webster]
Aventurine feldspar, a variety of oligoclase with internal
firelike reflections due to the presence of minute
crystals, probably of hematite; sunstone.
[1913 Webster] |
Feldspar
(gcide) | Feldspar \Feld"spar`\, Feldspath \Feld"spath`\, n. [G.
feldspath; feld field + spath spar.] (Min.)
A name given to a group of minerals, closely related in
crystalline form, and all silicates of alumina with either
potash, soda, lime, or, in one case, baryta. They occur in
crystals and crystalline masses, vitreous in luster, and
breaking rather easily in two directions at right angles to
each other, or nearly so. The colors are usually white or
nearly white, flesh-red, bluish, or greenish.
[1913 Webster]
Note: The group includes the monoclinic (orthoclastic)
species orthoclase or common potash feldspar, and the
rare hyalophane or baryta feldspar; also the triclinic
species (called in general plagioclase) microcline,
like orthoclase a potash feldspar; anorthite or lime
feldspar; albite or soda feldspar; also intermediate
between the last two species, labradorite, andesine,
oligoclase, containing both lime and soda in varying
amounts. The feldspars are essential constituents of
nearly all crystalline rocks, as granite, gneiss, mica,
slate, most kinds of basalt and trachyte, etc. The
decomposition of feldspar has yielded a large part of
the clay of the soil, also the mineral kaolin, an
essential material in the making of fine pottery.
Common feldspar is itself largely used for the same
purpose. Feldspathic |
Glassy feldspar
(gcide) | Glassy \Glass"y\, a.
1. Made of glass; vitreous; as, a glassy substance. --Bacon.
[1913 Webster]
2. Resembling glass in its properties, as in smoothness,
brittleness, or transparency; as, a glassy stream; a
glassy surface; the glassy deep.
[1913 Webster]
3. Dull; wanting life or fire; lackluster; -- said of the
eyes. "In his glassy eye." --Byron.
[1913 Webster]
Glassy feldspar (Min.), a variety of orthoclase; sanidine.
[1913 Webster]Sanidine \San"i*dine\, n. [Gr. ?. ?, a board. So called in
allusion to the tabular crystals.] (Min.)
A variety of orthoclase feldspar common in certain eruptive
rocks, as trachyte; -- called also glassy feldspar.
[1913 Webster] |
glassy feldspar
(gcide) | Glassy \Glass"y\, a.
1. Made of glass; vitreous; as, a glassy substance. --Bacon.
[1913 Webster]
2. Resembling glass in its properties, as in smoothness,
brittleness, or transparency; as, a glassy stream; a
glassy surface; the glassy deep.
[1913 Webster]
3. Dull; wanting life or fire; lackluster; -- said of the
eyes. "In his glassy eye." --Byron.
[1913 Webster]
Glassy feldspar (Min.), a variety of orthoclase; sanidine.
[1913 Webster]Sanidine \San"i*dine\, n. [Gr. ?. ?, a board. So called in
allusion to the tabular crystals.] (Min.)
A variety of orthoclase feldspar common in certain eruptive
rocks, as trachyte; -- called also glassy feldspar.
[1913 Webster] |
Labrador feldspar
(gcide) | Labrador \Lab`ra*dor"\, n.
A region of British America on the Atlantic coast, north of
Newfoundland.
[1913 Webster]
Labrador duck (Zool.), a sea duck ({Camtolaimus
Labradorius}) allied to the eider ducks. It was formerly
common on the coast of New England, but is now supposed to
be extinct, no specimens having been reported since 1878.
Labrador feldspar. See Labradorite.
Labrador tea (Bot.), a name of two low, evergreen shrubs of
the genus Ledum (Ledum palustre and {Ledum
latifolium}), found in Northern Europe and America. They
are used as tea in British America, and in Scandinavia as
a substitute for hops.
[1913 Webster] |
white feldspar
(wn) | white feldspar
n 1: a widely distributed feldspar that forms rocks [syn:
albite, white feldspar] |
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