Color Effects

Question 1

A six-pointed star formed by a beam of light at right angles to each set on inclusions

Answer 1

Asterism

Question 2

Band of light moves from side to side as in a cat’s eye

Answer 2

Chatoyancy

Question 3

Two directions have distinct colors

Answer 3

Dichroism

Question 4

On exposure to ultraviolet light, a mineral emits visible light

Answer 4

Fluorescence

Question 5

Shows a series of color due to light undergoing reflective interferences with itself either on the surface in the interior

Answer 5

Iridescence

Question 6

Play of colors or colored reflections exhibited

Answer 6

Labradorescence

Question 7

Caused by internal structures that selectively reflect only certain colors

Answer 7

Labradorescence

Question 8

Pearly reflection from the interior of a mineral, like the effect of a glass of water to which a few drops of milk have been added

Answer 8

Opalescence

Question 9

Some fluorescent minerals will continue to glow after the ultraviolet light has been turned off

Answer 9

Phosphorescence

Question 10

Exhibits internally the various prismatic colors when the mineral is turned

Answer 10

Play of Colors

Question 11

Appearance of different colors when a crystal is viewed in transmitted light in different directions

Answer 11

Pleochroism

Question 12

Some minerals will emit visible light when heated below red heat

Answer 12

Thermoluminescence

Question 13

Some minerals when rubbed or struck with a hammer will emit light

Answer 13

Triboluminescence