CS 24

Question 1

1. The most common crystal habit of all garnets is the
   A. cube.
   B. octahedron.
   C. dodecahedron.
   D. hexagonal prism.

Answer 1

dodecahedron

Question 2

1. The most important source of rhodolite in recent years has been
   A. Brazil.
   B. Burma.
   C. East Africa.
   D. the United States.

Answer 2

East Africa

Question 3

1. The substitution of one chemical element for another in the crystal structure of a mineral is called
   A. charge transfer.
   B. metamorphism.
   C. isomorphous replacement.
   D. intervalence charge transfer.

Answer 3

isomorphous replacement

Question 4

1. The most desirable, vibrant, and rare blue natural spinels are colored by
   A. iron.
   B. titanium.
   C. cobalt and iron.
   D. iron and chromium.

Answer 4

cobalt and iron

Question 5

1. In general the most desirable spinel color is
   A. red.
   B. green.
   C. violet.
   D. orange.

Answer 5

red

Question 6

1. The intense red color of spinel is caused by
   A. iron.
   B. chromium.
   C. manganese.
   D. color centers.

Answer 6

chromium

Question 7

1. Tsavorite is colored by
   A. iron.
   B. nickel.
   C. vanadium.
   D. chromium.

Answer 7

vanadium

Question 8

1. Rhodolite is a mixture of
   A. pyrope and andradite.
   B. pyrope and almandine.
   C. spessartine and pyrope.
   D. spessartine and andradite.

Answer 8

pyrope and almandine

Question 9

1. The trade term malaya is used for a pinkish orange garnet that’s a mixture of
   A. pyrope and almandine.
   B. andradite and spessartine.
   C. pyrope, andradite, and almandine.
   D. pyrope, spessartine, and almandine.

Answer 9

pyrope, spessartine, and almandine

Question 10

1. Tsavorite and hessonite are both varieties of
   A. pyrope.
   B. grossular.
   C. andradite.
   D. uvarovite.

Answer 10

grossular

Question 11

1. Spessartine is most commonly found in
   A. marble.
   B. limestone.
   C. pegmatite veins.
   D. metamorphic rock.

Answer 11

pegmatite veins

Question 12

1. Demantoid was first discovered in
   A. Brazil.
   B. Africa.
   C. Russia.
   D. Sri Lanka.

Answer 12

Russia

Question 13

1. Mandarin garnet has been used as a trade name for
   A. pyrope.
   B. tsavorite.
   C. andradite.
   D. spessartine.

Answer 13

spessartine

Question 14

1. Horsetail inclusions are found in
   A. malaya.
   B. tsavorite.
   C. demantoid.
   D. spessartine.

Answer 14

demantoid

Question 15

1. All garnets have essentially the same
   A. inclusions.
   B. crystal structure.
   C. impurity elements.
   D. chemical composition.

Answer 15

crystal structure