Page:Theophrastus - History of Stones - Hill (1774).djvu/303



Specific Character,

An hexangular Column of ix equal Sides, of the ame Ticknes from End to End; and terminated each way by an hexangular Pyramid; colourles, pellucid.

$a$ By Accident in their Concretion.

Perfect,

A Crytal of 18 Planes in a hort Column, and two long Pyramids.

Wanting the intermediate Column,

Wanting the lower Pyramid,

7.—Oblique