or ELLIPTICAL, something belonging to an ellipsis.

ELLIPOPACHROSTYLA, in natural history, a genus of imperfect crystals, with single pyramids; one end of their column being affixed to some solid body. They are dodecahedral, with thinner hexangular columns and hexangular pyramids.

Of these crystals, authors enumerate a great many species; among which are the whitish pellucid sprig crystal, a bright brown kind, a dull brown kind, and a bright yellow kind, all which are farther distinguished according to the different lengths of their pyramids.

ELLIPOPACHYSTYLA, in natural history, a genus of imperfect crystals, composed of twelve planes, in an hexangular column, terminated by an hexangular pyramid at one end, and irregularly affixed to some other body at the other, with shorter columns.

There are two species of these crystals, one short, bright and colourless, found in great plenty in New Spain and other parts of America; the other, a short, dull, and dusky brown one, found in Germany, and sometimes in England.