Wednesday, November 1 Write in your agenda: Wednesday, November 1 Write in your agenda: Homework: Finish Classwork Open your note guide to page 62 Think About It… What are some methods we can use to identify an unknown rock or mineral?

Physical Properties of Minerals Standard: 7.1 – Use a table of physical properties to classify minerals

Identifying Minerals Each mineral has its own specific properties that can be used to identify it, this is due to the fact that each mineral has its own unique make-up. Hardness- Mohs Hardness Scale Color Streak Luster Density Cleavage and Fracture Special Properties Fluorescence Double Refraction

Hardness- Mohs Hardness Scale Hardness (how hard a mineral is) is one of the best properties that can be used to help identify a mineral Mohs Hardness Scale ranks 10 minerals from softest to hardest, Talc is softest and Diamond is hardest

Mohs Hardness Scale

Color a physical property that is easy to observe. can only be used for a few minerals does not usually give enough information to make a definite identification.

Streak tells the color of a mineral’s powder. To find the streak of a mineral you rub the mineral against an unglazed tile called a streak plate.

Streak

Luster Luster describes how a mineral reflects light from its surface. Such as: Description Examples Glassy Quartz Silky Gypsum Greasy Talc, some Quartz Metallic Gold, Pyrite, Galena etc Earthy Kaolin Waxy some Serpentine Pearly Gypsum, some Talc Resinous Amber Brilliant Diamond Dull Graphite

Density Density is mass per unit volume. density is a physical property that will remain the same. Density= Mass/Volume D=M/V

Density Mass is the amount of matter in an object or material and is measured in milligrams, grams, or kilograms Volume is the amount of space that an object or material fills and is measured in milliliters, liters, or kiloliters (rarely in kiloliters) Density = mass /volume g/cm3

Density The density of liquid water is 1.0 grams per milliliter (1.0 g/ml) Anything > 1.0 g/ml sinks in water Anything < 1.0 g/ml floats in water

Density LOW DENSITY HIGH DENSITY

Cleavage a split evenly along flat surfaces due to how atoms are arranged Mica splits easily along a flat surface

Cleavage

Fracture A break in an irregular way and does not split apart evenly Think of bones, bones fracture

Fracture

Special Properties Fluorescence = can glow under ultraviolet light Magnetism = attracts iron Chemical reaction Taste = salty Radioactivity = contain uranium or radium Double Refraction produces two images when something is viewed

Special Properties Fluorescence Double Refraction

DO! Fluorescence Magnetism Chemical Reaction Taste Radioactivity hardness Special property Fluorescence Magnetism Chemical Reaction Taste Radioactivity Double Refraction Cleavage is when a mineral splits evenly along flat surfaces. A fracture is when a mineral breaks in an irregular way

DO! Mass is the amount of matter in an object. Volume is the amount of space an object takes up Density = Mass / Volume Density = M / V 20g / 15cm3 = 1.33

Keys to Understanding At LEAST 5 complete sentences Summarize the main points of the lesson Describe in detail the important ideas Write about concepts you want to remember This should be helpful to YOU!