EOSC 210: Mineral Review

Which of the following minerals have a metallic lustre?

• Quartz

• Magnetite

• Galena

• Pyrite

What is the hardness of gypsum? (Hint: you can scratch it with your fingernail)

• <2.5

• >2.5 but <5.5

• >5.5

What is the cleavage of mica (muscovite and biotite)?

• 2 planes at 90 degrees

• 1 perfect plane

• 3 planes at 90 degrees

• 2 planes not at 90 degrees

The hardness of biotite is ~2.5.

• True

• False

The most common cleavage or fracture for olivine is

• Uneven fracture

• Conchoidal fracture

• 2 planes at 90 degrees

• 2 planes not at 90 degrees

The lustre of muscovite is

• Metallic

• Vitreous

• Dull

• Waxy

Amphibole has a cleavage of

• 2 at 90 degrees

• 3 at 90 degrees

• 1 perfect plane

• 2 at 60/120 degrees

Garnet can have a crystal habit called dodecahedron (12 sides).

• True

• False

Which of the following minerals does not have a white streak?

• Garnet

• Amphibole

• Hematite

• Orthoclase

What is the cleavage/fracture of orthoclase?

• Uneven fracture

• Conchoidal fracture

• 2 at 90 degrees

• 2 not at 90 degrees