单词	pitchstone
释义	pitchstone /ˈpɪtʃstəʊn / noun [mass noun] Geology A dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.This feature was once described as ‘the finest ‘small’ mountain feature in the British Isles ’, and is in reality an east-west ridge of volcanic rock which appears as a narrow upthrust of columnar pitchstone when seen from the south or east.... Similarly, Arran pitchstone has turned up in Ireland and Orkney, highlighting the complex exchange networks between these places. Also found was a flake of green Arran pitchstone, thought to be a waste fragment from the manufacture of a tool.
随便看	pysanky Pytchley Pytchley coat Pytchley Hunt Pythagoras Pythagoras' theorem Pythagorean Pythagorean comma Pythagoreanise Pythagoreanism Pythagoreanize Pythagorean letter Pythagorean lyre Pythagorean number Pythagorean proposition Pythagorean system Pythagorean triple Pythagorean triplet Pythagoric Pythagorical pythagorically Pythagorician Pythagoricism Pythagorico-Platonic Pythagorism

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