CS 25

Question 1

1. What is the color of the markings that sandstone matrix creates in turquoise?
   A. Tan
   B. Green
   C. Dark red
   D. Dark brown

Answer 1

Tan

Question 2

1. The trade term for top-color turquoise is
   A. Persian.
   B. Mexican.
   C. Egyptian.
   D. American.

Answer 2

Persian

Question 3

1. The purest blue colors of turquoise are caused by
   A. iron.
   B. cobalt.
   C. copper.
   D. titanium.

Answer 3

Copper

Question 4

2. Which of the following does turquoise usually form in?
   A. Quartz
   B. Marble
   C. Granite
   D. Limonite

Answer 4

Limonite

Question 5

1. Reconstructed turquoise is
   A. treated turquoise.
   B. imitation turquoise.
   C. synthetic turquoise.
   D. stabilized turquoise.

Answer 5

imitation turquoise

Question 6

1. The world’s largest producer of turquoise today is
   A. Iran.
   B. Egypt.
   C. Afghanistan.
   D. the southwestern United States.

Answer 6

the southwestern United States

Question 7

1. The lapis lazuli trade grade that’s often spotted with green and shows obvious calcite is
   A. Afghan.
   B. Chilean.
   C. Siberian.
   D. Egyptian.

Answer 7

Chilean

Question 8

1. The only source of charoite is
   A. Iran.
   B. Russia.
   C. South Africa.
   D. the United States.

Answer 8

Russia

Question 9

1. Stabilized turquoise is a trade term for
   A. synthetic turquoise.
   B. a turquoise imitation.
   C. reconstructed turquoise.
   D. polymer-impregnated turquoise.

Answer 9

polymer-impregnated turquoise

Question 10

1. The world’s major source of lapis lazuli is
   A. Chile.
   B. Russia.
   C. Afghanistan.
   D. the United States.

Answer 10

Afghanistan

Question 11

1. The finest color of turquoise is
   A. light blue.
   B. dark green-blue.
   C. dark greenish blue.
   D. intense medium blue.

Answer 11

intense medium blue

Question 12

1. The major source for top-color turquoise today is
   A. Iran.
   B. China.
   C. Egypt.
   D. Afghanistan.

Answer 12

China

Question 13

1. The finest trade grade of lapis lazuli is
   A. Afghan.
   B. Chilean.
   C. Siberian.
   D. Egyptian.

Answer 13

Afghan

Question 14

1. Malachite’s color is caused by
   A. nickel.
   B. copper.
   C. vanadium.
   D. chromium.

Answer 14

copper

Question 15

1. A treatment that makes turquoise less porous without the use of polymers and improves its ability to take a good polish is
   A. diffusion.
   B. irradiation.
   C. heating and dyeing.
   D. the Zachery method.

Answer 15

the Zachery method