One species and color varieties
Aquamarine, emerald, morganite, heliodor, goshenite and red beryl are beryl varieties, rather than six independent beryl-group species.
Keep each chapter’s scientific identity: a family, species, variety, trade label, rock and fossil are different kinds of names.
Mineral variety
Aquamarine is the blue-to-greenish-blue variety of beryl. Some pieces are transparent enough for crisp facets; others are more included and show a softer color in beads or natural crystal specimens.
Darla Sondrol · CC0 · Display crop
Mineral variety
Emerald is green beryl, a relative of aquamarine. Its internal features can be just as memorable as the green color, making a slow look through a gem especially rewarding.
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Mineral variety
Morganite is pink to peach beryl. Its gentle color can be much easier to see in a larger cut gem than in a small, thin piece.
Robert M. Lavinsky · CC BY-SA 3.0 · Display crop
Mineral variety
Heliodor is a yellow to greenish-yellow beryl variety. A glassy crystal and a golden cut gem can share the same mineral identity.
DonGuennie (G-Empire The World Of Gems) · CC BY-SA 4.0 · Display crop
Mineral variety
Goshenite is colorless beryl. It offers a useful comparison with clear quartz: similar transparency does not mean identical chemistry or structure.
Géry PARENT · CC BY-SA 3.0 · Display crop
Mineral variety
Red beryl combines a strong red appearance with the chemistry of the beryl family. Collector crystals and suitable faceted material can look quite different.
Robert M. Lavinsky · CC BY-SA 3.0 · Display crop