As nouns the difference between gunstone and sunstone
is that gunstone is (obsolete) a cannonball while sunstone is (mineralogy) a translucent form of feldspar having flakes of hematite, used as an ornamental stone.
sunstone
English
Noun
(
wikipedia sunstone)
(
en noun)
(mineralogy) A translucent form of feldspar having flakes of hematite, used as an ornamental stone.
See also
*aventurine, aventurin, avanturine
*moonstone