Rocks and Minerals

a solid object that is formed in nature

• igneous rock
• mineral
• luster
• streak

the measure of how difficult it is for a mineral to be scratched

• mineral
• sedimentary rock
• igneous rock
• hardness

a naturally formed solid made of grains of one or more minerals

• rock
• metamorphic rock
• luster
• sedimentary rock

how shiny or dull a mineral is

• hardness
• luster
• sedimentary rock
• streak

the color of the powder left behind by a mineral when it is rubbed against an object

• mineral
• igneous rock
• streak
• rock

rock made when materials settle into layers and get squeezed until they harden into rock

• hardness
• luster
• sedimentary rock
• metamorphic rock

rock that was once melted and then cooled and hardened

• igneous rock
• luster
• mineral
• metamorphic rock

rock that has been changed by heat or pressure

• mineral
• metamorphic rock
• hardness
• sedimentary rock