6.10B/6.6C Minerals and Rock Cycle

Physical properties of minerals such as color, hardness, luster, and streak are used to determine what about a mineral?

• Mass

• Identity

• Volume

How do you test the hardness of a mineral?

• Observing the light reflecting off the surface

• Scratch Test

• Streak Test

What does a streak test tell you?

• The hardness of the mineral

• The light reflecting off the surface of the mineral

• Color of powder left behind

Which of the following describes luster?

• The way light reflects off an object

• The mass of an object

• The texture of an object

Refer to the Mohs Hardness Scale. A mineral with a hardness of 7 can scratch -

• Fluorite, but not Corundum

• Apatite, but not Feldspar

• Diamond, but not Calcite

Information on several minerals is given in this table. If one were to observe samples of the minerals from the table, which two would appear similar in color, but could be distinguished, one from the other, using a streak test?

• Chalcopyrite and platinum

• Hematite and alabandite

• Alabandite and chalcopyrite

Tags

NGSS.MS-PS1-2

Use the Mohs Hardness Scale below. Which mineral can scratch fluorite, but is scratched by orthoclase feldspar?

• Calcite

• Talc

• Apatite

What is the primary process that turns sediments into sedimentary rocks?

• Organisms walking on layers of sediment, pressing particles together tightly

• Upper layers of sediment, pressing down on lower layers of deposited sediment

• Magma cooling under the surface of Earth, crystallizing to form rock

The interlocking crystals of an igneous rock help to classify it since these crystals are evidence of how the rock formed. The crystals are a result of –

• quartz coming out of solution.

• particles forming layers.

• melted rock that cooled.

Metamorphic rocks are different from igneous and sedimentary rocks in that metamorphic rocks form -

• when liquid rock freezes into a solid.

• by magma rising from Earth’s core.

• from existing rock that has been changed.