| A | B |
|---|
| mineral | inorganic (nonliving) crystalline, solid substance with a definite chemical shape and composition |
| rock | relatively hard, naturally formed mineral or petrified matter; stone |
| igneous | rock formed by the solidification and crystallization of magma or lava |
| metamorphic | rocks formed by the effect of heat pressure and/or chemical action on other rocks, a recrystallization of pre-existing rocks |
| sedimentary | rock formed by compaction and cementation of sediment |
| fossil fuels | fuels such as coal, oil and natural gas which formed from organic matter in the ancient past |
| crystal structure | Earth material having a repeating pattern of characteristic shapes, due to a material's internal atomic structure |
| cleavage | the tendency of a mineral to break along one or more smooth planes or surfaces |
| fracture | the way a mineral breaks if it does not have cleavage |
| hardness | the resistance of a mineral to being scratched |
| streak | the color of the powder of a mineral |
| luster | the appearance of light reflected from a mineral's surface |
| crystal shape | cube (halite) and a tetrahedron (silicate) |
| crystallization | formation of solid crystals into a rock, such as igneous rock, when the crystals separate from the magma solution |
| solidification | same as crystallization |
