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.
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
Non-metallic luster Streak – red, brown Hardness - 5-6 Fracture This mineral is necessary in the creation of iron. Red soil usually contains large amounts of Hematite. Used in making red paints.