Related hydrated framework silicates
Species and group names remain distinct. Scolecite and natrolite differ chemically; apophyllite is kept outside the zeolite family.
Keep each chapter’s scientific identity: a family, species, variety, trade label, rock and fossil are different kinds of names.
Mineral species
Scolecite can grow in fine white sprays or slender transparent crystals. A small specimen may contain a remarkable amount of delicate structure that is easy to miss in a distant photograph.
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Mineral group / trade name
Stilbite-group minerals are familiar in peach, white and pale colors, often gathered into fan-like or sheaf-like clusters. Their pearly surfaces contrast with the sharper glassy faces of some companion minerals.
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Mineral species
Natrolite is familiar as fine white or colorless prismatic crystals, often in sprays. Its chemistry distinguishes it from calcium-bearing scolecite, even when the habits look similar.
Didier Descouens · CC BY-SA 4.0 · Display crop
Mineral group / trade name
Heulandite-group minerals can form pale or peach-colored tabular crystals. A cluster may share its host rock with several other cavity minerals.
Robert M. Lavinsky · CC BY-SA 3.0 · Display crop
Mineral species
Analcime often appears white or colorless in equant crystals with many faces. Its clean outlines make a small collector specimen interesting to study.
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Mineral group / trade name
Chabazite-group minerals often occur as pale rhombohedral-looking crystals in cavities. Their simple outlines can sit beside much more elongated companion minerals.
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