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For example, he observed that crystals of leucite and boracite, which are cubic in external form, are always doubly refracting and optically biaxial, but with a complex internal structure; and that cubic crystals of garnet and analcite sometimes exhibit the same phenomena.

Another interesting group of doleritic rocks contains analcite.

Their characteristic feature is the presence of a small amount of analcite, which never shows crystalline outlines but fills up the interspaces between the other minerals.

The copper is also accompanied by epidote, calcite, prehnite, analcite and other zeolitic minerals.

Dana prefers the term analcite.