Crust

• sial

  The granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and...

• sima

  Rock that form the continuous lower layer of the earth's crust; rich in silicon and magnes...

Geology

• shingling

  (geology) sediment in which flat pebbles are uniformly tilted in the same direction.

• matrix

  (geology) amass of fine-grained rock in which fossils, crystals, or gems are embedded.

Sedimentary Rock

• sedimentary rock

  Rock formed from consolidated clay sediments.

• limestone

  A sedimentary rock consisting mainly of calcium that was deposited by the remains of marine...

Also contains

• mineral

  Solid homogeneous inorganic substances occurring in nature having a definite chemical c...

• igneous rock

  Rock formed by the solidification of molten magma.

• metamorphic rock

  Rock altered by pressure and heat.

• gravel

  Rock fragments and pebbles.

• marble

  A hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building...

• claystone

  Fine-grained rock consisting of compacted clay particles.

• dolomite

  A kind of sedimentary rock resembling marble or limestone but rich in magnesium carbon...

• emery stone

  A mixture of emery dust and a binder; can be molded into grindstones.

• aphanite

  Fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the...

• conglomerate

  A composite rock made up of particles of varying size.

• quartzite

  Hard metamorphic rock consisting essentially of interlocking quartz crystals.

• road metal

  Broken rock used for repairing or making roads.

• tufa

  A soft porous rock consisting of calcium carbonate deposited from springs rich in lime.

• fieldstone

  Stone that occurs naturally in fields; often used as building material.

• caliche

  Nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru.

• magma

  Molten rock in the earth's crust.

• greisen

  A granitic rock composed of quartz and mica.

• pumice

  A light glass formed on the surface of some lavas; used as an abrasive.