Handbook of Mineralogy · Quartz
Cite: Handbook of Mineralogy (Mineralogical Society of America). Amethyst is a variety of quartz (SiO2), not a separate IMA species. https://www.handbookofmineralogy.org/pdfs/quartz.pdf

Mineral
Amethyst is purple quartz. Webmineral lists it as a variety of quartz (SiO2), not a separate species. People display clusters and wear beads. Jewelry and collecting are uses. This hub does not treat a personal meaning as a mineral fact. Cards below cite the quartz species pages that list this variety. See also Quartz varieties.
Cite: Handbook of Mineralogy (Mineralogical Society of America). Amethyst is a variety of quartz (SiO2), not a separate IMA species. https://www.handbookofmineralogy.org/pdfs/quartz.pdf
Cite: Webmineral Quartz Mineral Data. Lists amethyst as purple quartz. Named species page. https://webmineral.com/data/Quartz.shtml