Professor Blasdale's quantitative analysis is here given, and for comparison, two made on the Greenland neptunite, the first by Flink, the second by Sjöstrom.^[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. Sjöstrom represents the composition of the mineral by the formula ROR₂O.TiO₂.4SiO₂ and the same form can be applied with equal degree of success to the new analysis."

Natrolite is the gangue in which the benitoite and neptunite 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

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