CHAPTER XXIV

PALAGONITE

Its abundance in a fragmental condition in Vanua Levu, 337.—Its occurrence in deep-sea deposits, 338.—Modes of formation _in situ_, 338.—In the upper portion of a basaltic flow, 339.—In the groundmass of hemi-crystalline basaltic rocks, 339.—In veins in a basic tuff-agglomerate, 340.—In the fissures of a basaltic dyke, 341.—In the matrix of pitch-stone agglomerates, 349.—In “crush-tuffs,” 341.—Regarded as a solidified magma-residuum of low fusibility, 342.—Its connection with crushing, 342.—Bunsen’s experiment, 343.—Rosenbusch and Renard, 344.—The Nandua series of beds, 345.—Suggested explanation of the origin of palagonite, 346.—Type of basalt associated with palagonite, 347.—Hydration and disintegration of palagonite, 348

_Pages_ 337-349