| 单词 | pitchstone |
| 释义 | pitchstone (once / 135855 pages) n WORD FAMILY pitchstone USAGE EXAMPLESSuch media are the volcanic rocks when they are rapidly cooled, producing various kinds of pitchstone, obsidian, &c. Various, Encyclopaedia Britannica, 11th Edit...(2012) There are numerous varieties of lava, such as basalt, obsidian, pitchstone, pearlstone, trachyte, &c.; some are heavy compact rocks, others are light and porous. Geikie, James, Geology(2011) The last significant eruption, known as the Pitchstone Plateau lava flow, took place 70,000 years ago. Washington Post(Apr 21, 2010) n dark acid granitic glass Hyper volcanic glass a kind of natural glass produced when molten lava cools very rapidly |
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