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Science 4;1 & 5

Summary Sheets

QuestionAnswer
How do you perform the streak test? You take a piece of unglazed tile and rub the mineral on the paper to see what color the streak is. The streak color could be different from the color of the mineral.
Which mineral on the scale is the hardest? Diamond
Which mineral is the softest on the scale? Talc
List and number the 8 different properties used to identify minerals. Hardness Color Streak Luster Density Color systems Cleavage and Fracture Special Properties
What’s the difference between cleavage and fracture regarding minerals? Cleavage is when the mineral breaks easily along flat surfaces. Fracture is how a mineral looks after it has been broken in an unusual way.
How are they similar? Cleavage and fracture are the way a mineral breaks apart.
Some minerals have special properties. List a few of them. Fluorescence Magnetism Electrical
How do geologists classify rocks? Texture Grain Size Grain Shape Grain Pattern No Visible Grain Mineral Composition Origin
Texture is how a rock looks and feels .Give 4 examples of how a rock looks and feels Smooth Glassy Rough Chalky
Explain the difference between “coarse grained” and “fine grained” rocks. Coarse grained rocks that are large and easy to see. Fine grained rocks are rocks that have much smaller grain that can only be seen with a microscope.
How are rocks formed that have “no visible grain”? They are formed by cooling very quickly so that they have a smooth and shiny surface.
Origin refers to where a rock was formed. List the 3 major rock groups that group rocks by their origin. Igneous rock Sedimentary rock Metamorphic rock
Which rock group forms rocks using heat and pressure? Metamorphic rock because it is formed by an existing rock that gets changed by heat and pressure.
Created by: krugeli
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