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Specimen of highly porous pumice from Teide volcano on Tenerife, Canary Islands. Density of specimen approximately 0.25 g/cm3; scale in centimeters.
Specimen of highly porous pumice from Teide volcano on Tenerife, Canary Islands. Density of specimen approximately 0.25 g/cm3; scale in centimeters.
Kutkhiny Baty, a pumice rock formation outcrop located 4 km from the source of the Ozernaya River (Lake Kurile), near the southern tip of the Kamchatk
Kutkhiny Baty, a pumice rock formation outcrop located 4 km from the source of the Ozernaya River (Lake Kurile), near the southern tip of the Kamchatka Peninsula, Russia.
Illustrates the porous nature in detail.
Illustrates the porous nature in detail.
Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right.
Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right.
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Ignimbrite, a volcanic rock deposited by pyroclastic flows
Ignimbrite, a volcanic rock deposited by pyroclastic flows
Photomicrograph of a volcanic lithic fragment (sand grain); upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box
Photomicrograph of a volcanic lithic fragment (sand grain); upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box at left-center is 0.25 millimeter.
An aphanitic volcanic sand grain, with fine-grained groundmass, as seen under a petrographic microscope
An aphanitic volcanic sand grain, with fine-grained groundmass, as seen under a petrographic microscope
Vesicular olivine basalt from La Palma (green phenocrysts are olivine).
Vesicular olivine basalt from La Palma (green phenocrysts are olivine).