| A | B |
|---|
| cleavage | a mineral's ability to split easily along flat surfaces |
| crystal | a solid in which the atoms or molecules are arranged in a definite pattern that is repeated over and over again |
| fracture | the way a mineral looks when it breaks apart in an irregular way |
| grain | a particle or mineral or other rock that gives a rock its texture |
| igneous rock | a type of rock that forms from the cooling of molten rock at or below the surface |
| luster | the way a mineral reflects light |
| metamorphic rock | a type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions |
| mineral | a naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition |
| rock | solid formed from one or more minerals and possibly organic material |
| rock cycle | a series of processes on the surface and inside Earth that slowly changes rocks from one kind to another |
| sedimentary rock | a type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together |
| streak | the color of a minerals powder |
| texture | the size, shape and pattern of a rock's grain |
| intrusive | igneous rock formed from lava cooling on Earth's surface |
| extrusive | igneous rock formed from magma cooling underground |
| weathering | process by which rock is worn away by water, wind, or other elements |
| sediments | loose rock fragments, mineral grains, or remains of plants and animals |
| foliated | metamorphic rock marked with bands caused by pressed mineral grains |
| nonfoliated | metamorphic rock uniform in color, no bands |
| cementation | process in which sediment is bound together by the minerals of a evaporated solution |
