Rocks Crossword

a naturally occurring volcanic glass formed as an extrusive igneous rock.
a common type of felsic intrusive igneous rock that is granular and   phaneritic in texture.
a common extrusive igneous (volcanic) rock formed from the   rapid cooling of basaltic lava exposed at or very near the surface of a planet   or moon
an extrusive igneous, volcanic rock, of intermediate composition, with   aphanitic to porphyritic texture. 
a metamorphic rock composed of recrystallized carbonate minerals,   most commonly calcite or dolomite
is a hard, non-foliated metamorphic rock which was originally pure 
is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.
a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene. 
are a group of rock-forming tectosilicate minerals that make up as much as 60% of the Earth's crust