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The Rock of The Lamongan Volcano.
In accordance with Lorie and Prof. Behrens we have determined all collected samples as real basalts. The microscopic praeparates only show difference in relative number and size of the separated crystalls between them, and with respect to the groundmass, also in his capacity of the groundmass itself. As conson with basalt, the olivine exclusively appears as porphyric separation and not in the groundmass; augite on the contrary mainly occurs in the groundmass, alhough the cases are also not seldom, that great augitos occur porphyrically. The pyroxene belongs always exclusively to the monocline variety, the rhombie onen are absent.
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