= sense B.
| 单词 | θ5735 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > lava > vitreous (10) obsidian stone1601 = sense B. pitchstonea1728 Geology. A dull vitreous rock resembling hardened pitch, formed by partial hydration of obsidian. volcanic glass1780 = obsidian, n. obsidian1794 A hard, dark, glass-like volcanic rock which is formed by the rapid solidification of (usually acidic) lava without crystallization and shows a… pearlstone1806 A greyish glassy volcanic rock characterized by concentric spheroidal cracks (see perlite, n.). retinite1808 = pitchstone, n. 1. Obsolete. marekanite1818 Perlite, pearlstone. perlite1833 A glassy volcanic rock containing numerous concentric spheroidal cracks associated with the cooling that occurred during its formation (also called… Pele's hair1844 volcanic glass in the form of fine threads, formed by the rapid solidification of windblown lava and originally found around the Hawaiian volcano… Pele's tears1930 (with plural agreement) small drops of volcanic glass, usually tear-shaped or spheroidal, to which are attached strands of Pele's hair. |
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