Presentation on theme: " 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."— Presentation transcript:
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
If light passes through a mineral, you can say that it is transparent.
AA mineral’s luster is the way in which light reflects from the surface. TThe 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.