Third Order of the Hypersthene-Augite Andesites.
Characters.—Felspars of the groundmass short and stout
(orthophyric).
Formula.—Hypersth.-aug., matr., orth.
Remarks.—The same classification is to be employed here as in the case of the two previous orders, but as the rocks in my collection that belong to this order are not numerous (nine sections), it will be sufficient to refer to the general remarks on the order on p. [290].