ROCK IDENTIFICATION GLOSSARY aphanitic - referring to an igneous rock, fine grained minerals too small to be seen with the unaided eye batholith - a great irregular mass of coarse-grained igneous rock with an exposed surface of more than 100 km 2 , which has either intruded the country rock or been derived from it through metamorphism clastic - formed from clasts (particles) crystalline - of or pertaining to the nature of a crystal, crystal-like extrusive - formed from lava or other volcanic material spewed out onto the surface of the Earth felsic - description for a light-colored igneous rock that is poor in iron and magnesium and contains abundant feldspars and quartz fissile - capable of being easily split along closely spaced planes gneissic - pertaining to texture of gneisses, foliation igneous rock - a rock formed by the solidification of magma intrusive - igneous rock that forced its way in a molten state into the country rock mafic - used to describe rocks rich in mafic minerals which are dark colored minerals rich in iron and magnesium metamorphic rock - a rock whose original mineralogy, texture, or composition has been changed by the effects of pressure, temperature, or the gain or loss of chemical components metamorphism - the mineralogical, chemical, and structural adjustment of solid rocks to physical and chemical conditions imposed at depth below the surface zones of weathering and cementation mica - muscovite from mineral lab, monoclinic minerals, sheet silicates phaneritic - texture of an igneous rock in which the minerals can be seen with the unaided eye phyllitic - pertaining to the texture of a metamorphic rock intermediate in grade between slate and schist, may have a greenish appearance due to the presence of chlorite, is shiny and has a smooth, silky feel compared to schist plagioclase - collectively the group of triclinic feldspars schistose - rock displaying schistosity , appearance of schist sedimentary rock - a rock formed by the accumulation and cementation of mineral grains by wind, mater, or ice transportation to the site of deposition or by chemical precipitation slaty - parallel foliation of fine-grained, platy minerals, mainly chlorite a green mineral, slate-like vesicular - characterized by open spaces
(fine grained minerals too small; to be seen; with the unaided eye batholith) (a rock; formed; by the solidification of magma intrusive - igneous rock) (a greenish appearance due to the presence of chlorite; has; a smooth, silky feel) (a light-colored igneous rock; is; poor; L:in iron and magnesium) (schistose - rock; displaying; schistosity , appearance of schist sedimentary rock) (mafic minerals; are; dark colored minerals rich in iron and magnesium) (more than 100 km 2; has intruded; the country rock) (the minerals; can be seen; L:an igneous rock) (a rock; formed; by the accumulation and cementation of mineral grains by wind, mater, or ice transportation to the site of deposition or by chemical precipitation slaty - parallel foliation of fine-grained) (a light-colored igneous rock; contains; abundant feldspars and quartz fissile - capable of being easily split along closely spaced planes gneissic - pertaining to texture of gneisses) (more than 100 km 2; been derived; from it) (sheet; silicates; phaneritic - texture of an igneous rock) (magma intrusive - igneous rock; forced; its way; in a molten state) (a greenish appearance due to the presence of chlorite; is; shiny) (physical and chemical conditions; imposed; at depth)
fine grained minerals too small a rock a greenish appearance due to the presence of chlorite a light-colored igneous rock schistose - rock mafic minerals more than 100 km 2 the minerals a rock a light-colored igneous rock more than 100 km 2 sheet magma intrusive - igneous rock a greenish appearance due to the presence of chlorite physical and chemical conditions
to be seen formed has is displaying are has intruded can be seen formed contains been derived silicates forced is imposed
with the unaided eye batholith
by the solidification of magma intrusive - igneous rock
a smooth, silky feel
poor L:in iron and magnesium
schistosity , appearance of schist sedimentary rock
dark colored minerals rich in iron and magnesium
the country rock
L:an igneous rock
by the accumulation and cementation of mineral grains by wind, mater, or ice transportation to the site of deposition or by chemical precipitation slaty - parallel foliation of fine-grained
abundant feldspars and quartz fissile - capable of being easily split along closely spaced planes gneissic - pertaining to texture of gneisses
from it
phaneritic - texture of an igneous rock
its way in a molten state
shiny
at depth