QUARTER 1: LESSON 3: ROCK-FORMING MINERALS

Question 1

refers to how light is reflected from the surface of a mineral.

Answer 1

Luster

Question 2

it is the ability of mineral to resist scratching.

Answer 2

Hardness

Question 3

a German
mineralogist, developed a hardness scale over 100 years ago.

Answer 3

Friedrich Mohs

Question 4

The hardest mineral known

Answer 4

diamond

Question 5

refers to the characteristic shape of a mineral unit which are visible
(either an individual crystal or a group of crystal).

Answer 5

Crystal Form Habit

Question 6

one of the most obvious characteristics of a mineral, but generally not the most useful
diagnostic feature.

Answer 6

Color

Question 7

Minerals are colored because?

Answer 7

certain wavelengths are absorbed and the
color results from the combination of those wave lengths that reach the eye.

Question 8

is the mineral’s color in powdered form.

Answer 8

Streak

Question 9

it is the ability of a mineral to break along preferred planes. The number of cleavage
planes in a mineral may also aid its identification. The tendency of a Mineral to break evenly along its weakest
plane.

Answer 9

Cleavage

Question 10

Mineral breaks unevenly or irregularly.

Answer 10

Fracture

Question 11

is the “heaviness” of a mineral. It is defined as number that expresses the ratio between the weight of a mineral the weight of an equal
volume of water.

Answer 11

Specific Gravity