How is a rock like a salad?

Physical Properties of Minerals Color Some minerals only occur as one color. However, some minerals, such as quartz can be many different colors. Streak The color of powdered mineral. Mineral is scraped across a ceramic plate to create powder. Streak and color are NOT always the same (e.g., pyrite). Cleavage When a mineral breaks to form one or more flat surfaces it is said to have cleavage(e.g., mica). Luster Describes the way a mineral reflects light from it’s surface. Either metallic or non-metallic. Hardness A measure of how easily a mineral can be scratched. Measured on a Scale from 1 (softest) to 10 (hardest).

Color

Luster – metallic or non-metallic Pyrite A.

Streak – the color of powdered rock

Mineral Identification Mineral A Color: Lustre: Streak: Answer Mineral B Color: Lustre: Streak: Answer Mineral C Color: Lustre: Streak: Answer

The Rock Cycle: Rock Types and Processes IGNEOUS ROCK Formed when magma cools Intrusive – magma that cools VERY slowly usually deep in the earths crust Extrusive – magma that cools VERY quickly usually ejected from volcanoes SEDIMENTARY ROCK Formed from pieces of solid materials that have been deposited on Earth’s surface. The solid pieces start out as loose grains (e.g., sand) and are known as sediment but become cemented together to form solid rock Weathering & Erosion METAMORPHIC ROCK Formed when rock is exposed to tremendous heat and pressure. The rock is often deformed and the original mineral crystals and/or grains recrystallize to form NEW minerals Burial Melting

Igneous Rocks Formed from cooled magma

Sedimentary Rocks Formed from eroded sediment

Metamorphic Rocks Formed by heat and pressure