plagioclase
[ pley-jee-uh-kleys ]
/ ˈpleɪ dʒi əˌkleɪs /
noun
any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces.
Also called
soda-lime feldspar.
OTHER WORDS FROM plagioclase
pla·gi·o·clas·tic [pley-jee-uh-klas-tik] /ˌpleɪ dʒi əˈklæs tɪk/, adjectiveWords nearby plagioclase
plagiarism,
plagiarize,
plagiary,
plagio-,
plagiocephaly,
plagioclase,
plagioclimax,
plagiohedral,
plagiotropic,
plagiotropism,
plague
Example sentences from the Web for plagioclase
British Dictionary definitions for plagioclase
plagioclase
/ (ˈpleɪdʒɪəʊˌkleɪz) /
noun
a series of feldspar minerals consisting of a mixture of sodium and calcium aluminium silicates in triclinic crystalline form: includes albite, oligoclase, and labradorite
Derived forms of plagioclase
plagioclastic (ˌpleɪdʒɪəʊˈklæstɪk), adjectiveScientific definitions for plagioclase
plagioclase
[ plā′jē-ə-klās′ ]
Any of a series of common feldspar minerals, consisting of differing mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to black. It occurs in igneous rocks. The minerals albite, oligoclase, andesine, labradorite, bytownite, and anorthite are all plagioclases. Chemical formula: (Na,Ca)Al(Si,Al)Si2O8.