 Streak is closely related to color, but is a different property because the color of the mineral may be different than the color of the streak.color  Streak is actually the color of the powder of a mineral. It is called streak because the proper way to test for streak is to rub a mineral across a tile of white unglazed porcelain and to examine the color of the "streak" left behind.

 A mineral’s hardness is its resistance to being scratched.  A scale known as the Moh’s scale is often use  Fingernail – 2  Penny – 3  Nail – 5

 Smooth  Rough  Gritty  Sandy  Sharp  Powdery  Greasy

 If light passes through a mineral, you can say that it is transparent.

AA mineral’s luster is the way in which light reflects from the surface. TThe two major types of luster are metallic & nonmetallic.

 When a mineral breaks it does so either by fracturing or by cleaving.fracturing  Cleavage is the tendency of a mineral to break along flat surfaces.  Crystal cleavage is a smooth break producing what appears to be a flat crystal face.  Fracture is the tendency of a mineral to break into irregular pieces.

 Fluorescence: some minerals glow when exposed to ultraviolet light  Magnetic: Some minerals are attracted to magnets  Acid: Some minerals react with acid by bubbling

MINERALS WITH METALLIC LUSTER

 Metallic Luster  Black to grey streak  Hardness approx. 2  Cleavage  Used in pencil lead, used in batteries

 Metallic Luster – under the oxidation.  Streak- Copper Red  Hardness – approx. 3  Hackly Cleavage  Used in coins, pipes, gutters, and wire.

 Metallic Luster  Streak- greenish black  Hardess - +5  Fracture  Used as a source of iron, also known as Fool’s Gold.

MINERALS WITH NONMETALLIC LUSTER

 Non-metallic luster  Streak – white  Hardness – 1 -2  Fracture  Used in talcum powder, used in making make-up and used in making paper

 Nonmetallic Luster  Streak – white  Hardness – 2  Fracture  Used in making ceramics and in china dishes, common ingredient in soils.

 Nonmetallic luster  Streak – yellow to white  Hardness – 2  Fracture  Used in medicine, fungicide in plants, used to make sulfuric acid

 Nonmetallic luster  Streak – colorless  Hardness – 3  Cleavage  Used as an insulator in electrical equipment

 Nonmetallic luster  Streak – colorless  Hardness – 3  Cleavage  Used in electrical insulation

 Nonmetallic Luster  Steak – colorless  Hardness – 3  Cleavage  Salt – used as a preservative

 Nonmetallic luster  Streak – colorless to white  Hardness – 3  Cleavage  Used in cement and other building material

 Nonmetallic luster  Streak - colorless  Hardness – 5  Used in making optical equipment, glows under UV light

 Non-metallic luster  Streak – red, brown  Hardness  Fracture  This mineral is necessary in the creation of iron. Red soil usually contains large amounts of Hematite. Used in making red paints.

 Nonmetallic luster  Streak – colorless  Hardness - +5  Fracture  Used in ceramics

 Nonmetallic luster  Streak – colorless  Hardness – 5+  Fracture  Used in glass manufacturing, electronic equipment- radios, computers, watches and gem stones.

 Nonmetallic Luster  Streak-white  Hardness  Fracture  Uses- building material, ingredient in concrete

 Nonmetallic luster  Streak – white to light blue  Hardness- 3.5 – 4  Fracture  Uses – in jewelry and as a blue pigment in paint.