Home » categories » rare book library » Louderback. Benitoite.

Copper Minerals

Copper Minerals Page of 65 Copper Minerals Text size:minus plus Restore normal size   Mail page  Print this page
Vol. 5]
Louderback.—Benitoite.
357
Chemical Characters.
It is practically insoluble in hydrochloric acid and may there­fore be chemically separated from the natrolite matrix as is the case with the benitoite.
Professor Blasdale's quantitative analysis is here given, and for comparison, two made on the Greenland neptunite, the first by Flink, the second by Sjöström.13
He says "The results show a substantial agreement in the composition of the mineral from the two localities, the most marked differences apparently resulting from the substitution of magnesium and iron for some of the manganese in the Greenland specimens. Sjöström represents the composition of the mineral by the formula ROR2O.Ti02.4Si02 and the same form can be applied with equal degree of success to the new analysis."
NATROLITE.
Natrolite is the gangue in which the benitoite and nepttfnite occur, and it is also found in veinlets without associates.
Fracture of the solid vein-stone shows a mass of xenomorphic crystals exhibiting a good cleavage that yields more or less curved surfaces. The general texture is granular but with common development of radiate forms quite different from the usual radiate arrangement of natrolite and not showing such distinct straight-line boundaries to the components.
Where open spaces occur in the veins allowing the formation of crystal faces, peculiar aggregates are found entirely unlike the
Copper Minerals Page of 65 Copper Minerals
Suggested Illustrations
Other Chapters you may find useful
bullet Tag
This Page