Physics, 11.01.2020 01:31 lunaangelique1p442id

Which of the following statements about gemstones is true? choose one:

a. emerald is a gemstone variety of the common mineral corundum.
b. in order to be considered precious or semiprecious, a gemstone must be transparent.
c. a gemstone is a variety of a mineral that has value because of its color.
d. many gemstones come from pegmatites, which are particularly coarse-grained igneous rocks.

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Which of the following statements about gemstones is true? choose one:

a. emerald is...