EOSC 210 Lab 1 Review

What is the distinguishing property of magnetite?

• It is black.

• It has a dull metallic lustre.

• It is magnetic.

• All of the above.

Which of the following are true about galena?

• It has a high specific gravity.

• It has a bright metallic lustre.

• The hardness is 2.5.

• It has a red colour.

Hematite can have a metallic lustre or an earthy/dull lustre.

• True

• False

What is the colour of hematite's streak?

• Orange

• Greyish green

• Black

• Reddish brown

Which of the following are properties of pyrite?

• It has a metallic lustre.

• It has a greenish black streak.

• The hardness is less than 2.5.

• The hardness is greater than 5.5.

How can you distinguish pyrite from chalcopyrite?

• Streak: pyrite = greenish black whereas chalcopyrite = greenish black

• Hardness: pyrite = 6.5 whereas chalcopyrite = 3.5

• Lustre: pyrite = metallic whereas chalcopyrite = metallic

• Colour: pyrite = pale brass yellow whereas chalcopyrite = bright brass yellow

What is a distinguishing property of calcite?

• It has a white streak.

• It has a hardness <2.5.

• It has a strong reaction with HCl.

• The colour can be variable.

Which of the following is false?

• Calcite can be pink.

• Calcite can be clear/colourless.

• Calcite can be white.

• Calcite can be black.

What is the lustre of pyroxene?

• Metallic

• Non-metallic, vitreous

• Non-metallic, earthy

• Non-metallic, pearly

The hardness of pyroxene and plagioclase are very similar, around 5-6.5.

• True

• False