plagioclase


pla·gio·clase

noun \ˈplā-j(ē-)ə-ˌklās, ˈpla-, -ˌklāz\

Definition of PLAGIOCLASE

:  a triclinic feldspar; especially :  one having calcium or sodium in its composition

Origin of PLAGIOCLASE

Greek plagios oblique + klasis breaking, from klan to break — more at clast
First Known Use: circa 1868

plagioclase

noun    (Concise Encyclopedia)

Any member of the series of abundant feldspar minerals that usually occur as light- to medium-grey-coloured, transparent to translucent grains or crystals. Plagioclase ranges in composition from albite to anorthite. It is used in the manufacture of glass and ceramics; iridescent varieties are valued as gemstones. The primary importance of plagioclase, however, derives from its role as a rock-forming mineral.

Browse

Next Word in the Dictionary: plagioclinal
Previous Word in the Dictionary: plagiochila
All Words Near: plagioclase

Seen & Heard

What made you want to look up plagioclase? Please tell us where you read or heard it (including the quote, if possible).