 A mineral that most living things need- you can find this in milk or cheese

 A resistance of a material or metal to scratching or breaking

 The way the light reflects from the surface of a mineral

 A shiny, dense substance that easily conducts heat and electricity

 A natural, solid substance found in rocks

 minerals in rock that can be extracted and used by people to make things

 The color of a mineral in a powered form

 a type of rock that forms when melted rock cools and hardens

 one of the major types of rock that is created from previously existing rock by the action of intense heat and pressure

 a type of rock formed by gravity pressing fragments of other rocks and minerals together as they settle on land or under the ocean over a long period of time