TRICLINIC PYROXENE.—Mr. J. J. Harris Teall points out to us that since the paper was written on this subject by Mr. Whitman Cross, to which reference was made in NATURE (ante, p. 155), this author has ...

SILICATES of the amphibole group are known to decompose endothermically, at temperatures above 600° C, to give a pyroxene and other products 1–3. The composition of the pyroxene and other products is ...

Southern Arizona has numerous sites known for their pyroxene minerals, from Twin Buttes south of Tucson, to Ajo, to the Chiricahua, Santa Rita and Patagonia mountain ranges. Pyroxenes are classified ...