CS 22 Flashcards
In order to attain a treated pink color, yellow to reddish brown topaz must contain
A. iron. B. cobalt. C. chromium. D. manganese.
chromium
The term “precious topaz” is used for
A. red stones. B. blue stones. C. pink stones. D. orange-to-yellow stones.
orange-to-yellow stones.
What color is morganite beryl?
A. Pink B. Green C. Yellow D. Dark blue
pink
Which of the following is the rarest beryl?
A. Red beryl B. Morganite C. Aquamarine D. Golden beryl
red beryl
The finest aquamarine color is moderately strong,
A. light green-blue.
B. light greenish blue.
C. medium-dark bluish green to blue.
D. medium-dark blue to slightly greenish blue.
medium-dark blue to slightly greenish blue
The world’s major source of imperial and red topaz is
A. Mogok. B. Nova Era. C. Ouro Preto. D. the Wah Wah Mountains area
Ouro Preto.
Which source emerged as a leading producer of small, commercial-quality aquamarine in the 1990s?
A. China B. Kenya C. Colombia D. The United States
China
The most valuable topaz varieties are
A. purple.
B. yellow.
C. pink and red.
D. green and blue
pink and red
The only source of red beryl is in the US state of
A. Utah. B. Nevada. C. Colorado. D. California.
Utah
The most important source of aquamarine is
A. Brazil. B. Australia. C. Mozambique. D. the United States
Brazil
Which method is used to produce synthetic aquamarine?
A. Flux B. Pulling C. Flame fusion D. Hydrothermal
Hydrothermal
In nature, topaz is commonly
A. pink.
B. colorless.
C. dark blue.
D. orange-red.
colorless
Natural pink, red, and violet-to-purple colors in topaz are caused by
A. boron. B. chromium. C. manganese. D. color centers.
chromium
The color of imperial topaz is
A. green.
B. violetish blue.
C. brownish orange.
D. reddish orange to orange
reddish orange to orange
Most aquamarine has its color improved by
A. heat.
B. diffusion.
C. irradiation.
D. irradiation followed by heat.
heat
