| A | B |
|---|
| igneous | a type of rock formed by the cooling and crystallization of molten materials |
| indigenous | occurring naturally in a particular place or region |
| laser | Light Amplification by Stimulated Emission of Radiation |
| lava | molten rock that flows from volcanoes or earth fissures |
| luster | the way a mineral reflects light |
| magma | the hot, liquid rock within the earth's crust |
| metallic luster | a mineral that is usually dark in color and that is always opaque, even on its thin edges |
| metamorphic | a type of rock formed when igneous, sedimentary, or even other metamorphic rocks are subjected to extreme heat and/or pressure deep below the earth's surface |
| mineral | a naturally occurring, solid, inorganic substance with a definite chemical composition and usually crystalline in form |
| Mohs' scale of hardness | a scale that ranks the hardness of minerals relative to the hardness of other minerals |
| monoclinic | a crystal form characterized by three unequal axes with one oblique intersection |
