| 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 |
| gemstone | a hard, colorful mineral that has a brilliant or glassy luster |
| 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 | the material that forms Earth's hard surface |
| 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 |
| vein | a narrow channel or slab of a mineral that is different from the surrounding rock |
