A Purple Gemstone
This page is the CodyCross answer for the clue below from Physics, Group 1896, Puzzle 1 (Dorothy Vaughan).
Question is: A Purple Gemstone
and the answer is: AMETHYST
Word Meaning:
AMETHYST — A transparent purple to violet variety of quartz with traces of manganese, used as a gemstone.
Definitions from Wiktionary.