Identify TWO physical properties, other than hardness, that may add to the beauty of a gemstone.

• Color

• Streak

• Luster

• Reaction with acid

The data table shows two physical properties of the minerals quartz and amphibole (hornblende). Select the physical property from the table that can distinguish quartz from amphibole and describe a procedure that can be used to test this property.

Physical Property: __________________ (Include in answer)

Procedure: _____________________ (Include in answer)

• Streak - rub it on the tile and see the color of its powder

• Streak - rub it on glass plate and see if it scratches it

• Luster - see how shiny it is

• Luster - rub it on the tile and see the color of its powder

Tags

NGSS.MS-PS1-2

Identify the mineral in the table that is hard, has a black streak, and has no reaction with acid.

• chalcopyrite

• feldspar

• hornblende

• graphite

Compared to the chalcopyrite, which property of galena is different?

• Hardness

• Streak

• Reaction with acid

• All

Identify the mineral that has the greatest difference between the color of its powder and the color of its outside surface.

• Kaolinite

• Galena

• Graphite

• Magnetite

• Olivine

Explain why a sample of magnetite will scratch a sample of galena.

• Because magnetite‘s streak is black and will scratch galena that because its streak is only gray black.

• Because magnetite is hard and will scratch galena since it is soft.

• Because magnetite is metallic and will scratch galena since it is also metallic.

• Because magnetite’s density is 5.2 g/cm3 and will scratch galena whose density is only 7.5 g/cm3.

Which mineral is hard and has the same color and streak?

• magnetite

• muscovite mica

• pyrite

• sulfur

Which physical property best distinguishes magnetite from pyrite?

• luster

• streak

• color

• hardness

Tags

NGSS.MS-PS1-2

Which statement is true of all rocks?

• Rocks contain organic material.

• Rocks contain fossils.

• Rocks are composed of minerals

• Rocks are formed in layers.

Igneous rocks are formed by

• weathering

• cementation

• volcanic activity

• sedimentation