tyler cox rock crossword

hot molten or semi-fluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this.
a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams and used as fuel.
often mined in coober pedy
a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone:
is used especially for smoothing and polishing things or for softening the skin.
black,glassy like
the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form
A sedimentary rock formed of sand-sized grains that have been either compacted or cemented together
is something produced by volcanic action or intense fire. Rocks that have formed from solidified lava from a volcano are an example
a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
a hard mineral consisting of silica, found widely in igneous and metamorphic rocks
a very expemsive crystal