- Varieties that are not valid species:
- Agate (variety of quartz)
- Alabaster (variety of gypsum)
- Alexandrite (variety of chrysoberyl)
- Allingite (synonym of amber)
- Alum
- Amazonite (variety of microcline)
- Amber (fossilized resin)
- Amethyst (purple variety of quartz)
- Ammolite (organic; also a gemstone)
- Amosite (asbestiform grunerite)
- Anyolite (metamorphic rock - zoisite, ruby, and hornblende)
- Antozonite (variety of fluorite)
- Aquamarine (light blue variety of beryl)
- Argentite (high temperature form of acanthite)
- Asbestos (fibrous serpentine- or amphibole minerals)
- Avalite (chromian variety of illite.)
- Aventurine (variety of quartz)
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