Where Do Rocks Come From?

Tuesday, August 20, 2013 posted by Joan
Leave No Stone Unturned Business Gifts

Leave No Stone Unturned Business Gifts

There is something very special about the look and feel of stone.  It has been here for millions of years, but there are different kinds of stone.  There are igneous, metamorphic and sedimentary stone.   Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface or on the surface. These rocks come from under the earth’s crust.   Lava and marble are examples.

Metamorphic rocks are those that formed only at high temperatures and pressures associated with the process of metamorphism. Examples include sillimanite, kyanite and some garnet.  Metamorphic rock was sometimes formed when certain minerals were trapped between other rock creating the pressure necessary for formation.

Sedimentary rock is quite different.  These rocks are formed by the deposits of materials at the Earth’s surface and within bodies of water. Particles that form a sedimentary rock by accumulating are called sediment.  Examples are sandstone, coal  and shale.

Which of these do you think make the best engraved stones?  River bed  stones are the best source for engraved stones and can contain all three types of rock.

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