rapilli

In proportion as the elasticity of the vapours diminishes, the matter is thrown to a less distance; and the black rapilli, which issue first, when the lava has ceased running, must necessarily reach farther than the white rapilli.

Travels to the Equinoctial Regions of America 1851

In proportion as the elasticity of the vapours diminishes, the matter is thrown to a less distance; and the black rapilli, which issue first, when the lava has ceased running, must necessarily reach farther than the white rapilli.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814

Liv., xxv., 7, it probably refers to pumice ( 'rapilli') ejected from the volcano, Mount Albanus (Monte Cavo), which was not wholly extinguished at the time.

COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814

Now retama, a hardy bitter shrub, grows in these plains of pumice; the flats of it are pumice and rapilli, white and brown.

A Tramp's Notebook Morley Roberts 1899

Where level, Las Cañádas is a floor of rapilli and pumice-fragments, none larger than a walnut, but growing bigger as they approach the Pike.

To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I Richard Francis Burton 1855

Now, at Teneriffe, the black rapilli extend from the foot of the Peak to the sea-shore; while the white ashes, which are only pumice ground to powder, and among which I have discovered, with a lens, fragments of vitreous feldspar and pyroxene, exclusively occupy the region next to the Peak.

Travels to the Equinoctial Regions of America 1851

The sea of white ashes which encircles the Piton, and covers the vast plain of Retama, is a certain proof of the former activity of the crater: for in all volcanoes, even when there are lateral eruptions, the ashes and the rapilli issue conjointly with the vapours only from the opening at the summit of the mountain.

Travels to the Equinoctial Regions of America 1851

Whenever the rock appeared, we discovered basaltic amygdaloid* covered with hardened clay, * which contains rapilli, or fragments of pumice-stone.

Travels to the Equinoctial Regions of America 1851

Mons Albanus, near Rome, known at present under the name of Monte Cavo, appeared at times on fire during the night; but the Mons Albanus is a volcano recently extinguished, which, in the time of Cato, threw out rapilli; * while the Cuchivano is a calcareous mountain, remote from any trap formation.

Travels to the Equinoctial Regions of America 1851

Piton, and covers the vast plain of Retama, is a certain proof of the former activity of the crater: for in all volcanoes, even when there are lateral eruptions, the ashes and the rapilli issue conjointly with the vapours only from the opening at the summit of the mountain.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814