collectively the group of triclinic feldspars
Plagioclase - Sodium or calcium feldspars, classified by the percentage of sodium or calcium they contain; a principal component of basalts and andesites.
(play' jee oh clace) - A common rock-forming series of feldspars consisting of mixtures of sodium and calcium aluminum silicates.
A group of triclinic feldspar minerals with the general formula (Na,Ca)Al(Si,Al)Si2O8 ; plagioclases are one of the most common rock-forming minerals.
any of a rock-forming series of triclinic feldspars
the name for a series of minerals ranging from sodium aluminum silicate through various combinations of sodium and calcium silicate to calcium silicate.
A mineral with the chemical composition calcium sodium silicate formed by the crystallization of all magmas across the range basalt to rhyodacite.
A member of the feldspar family consisting of a compositionally continuous series between albite (NaAlSi) and anorthite (CaAl Si).
A member of the feldspar mineral family. Plagioclase feldspars are silicates that contain considerable sodium and calcium. Feldspar crystals are stubby prisms, generally white to gray and a glassy luster. more details...
a mineral group composed of varying amounts of sodium, calcium, aluminum and silica (Si) in a Si2O8 base. One of the most common rock-forming mineral types.
a group of silicate minerals containing calcium and sodium.
A triclinic mineral with the general chemical composition of Al2Si2O8
a common mineral in igneous rocks, containing calcium, sodium, aluminum, silicon, and oxygen.
one of the two major types of feldspar, containing sodium or calcium (usually both) and having its two prominent cleavage directions oblique to one another. [AHDOS
Plagioclase is a very important series of tectosilicate minerals within the feldspar family. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a solid solution series, more properly known as the plagioclase feldspar series (from the Greek "oblique fracture", in reference to its two cleavage angles). The series ranges from albite to anorthite (with respective compositions NaAlSi3O8 to CaAl2Si2O8), where sodium and calcium atoms can substitute for each other in the mineral's crystal lattice structure.
