pearlstonen.

Brit.

/ˈpəːlstəʊn/, U.S.

/ˈpərlˌstoʊn/

Origin: Formed within English, by compounding. Etymons: pearl n.¹, stone n.

Etymology: < pearl n.¹ + stone n.

Geology.

A greyish glassy volcanic rock characterized by concentric spheroidal cracks (see perlite n.).

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > lava > vitreous

obsidian stone1601

pitchstonea1728

volcanic glass1780

obsidian1794

pearlstone1806

retinite1808

marekanite1818

perlite1833

Pele's hair1844

Pele's tears1930

1806 W. Henry Epitome Chem. (ed. 4) ii. ii. 350 The same skilful analyst has found potash in Hungarian pearl-stone.

1852 T. Ross tr. A. von Humboldt Personal Narr. Trav. Amer. I. ii. 102 I consider even the pearlstone as an unvitrified obsidian.

1920 A. W. Grabau Textbk. Geol. I. vi. 98 Perlite, or pearl stone... This is glass composed of numerous rounded masses, with concentric structure like the coats of an onion, formed by contraction in cooling and separated by larger straight cracks.

1940 F. F. Grout Handbk. Rocks (ed. 6) v. 102 The perlites have usually 2–4 per cent of water. The word is also written pearlstone, and was suggested by the fancied resemblance of the concentric shells to the familiar gem.

1999 Mining Jrnl. (Nexis) 5 Nov. 206 M&S presented a business plan with recommendations on the formation of production using non-metallic mineral materials, including basalt, clay, diatomite, quartz, pearlstone and mineral filling agents.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pearlstone
释义	pearlstonen. Brit. /ˈpəːlstəʊn/, U.S. /ˈpərlˌstoʊn/ Origin: Formed within English, by compounding. Etymons: pearl n.¹, stone n. Etymology: < pearl n.¹ + stone n. Geology. A greyish glassy volcanic rock characterized by concentric spheroidal cracks (see perlite n.). ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > lava > vitreous obsidian stone1601 pitchstonea1728 volcanic glass1780 obsidian1794 pearlstone1806 retinite1808 marekanite1818 perlite1833 Pele's hair1844 Pele's tears1930 1806 W. Henry Epitome Chem. (ed. 4) ii. ii. 350 The same skilful analyst has found potash in Hungarian pearl-stone. 1852 T. Ross tr. A. von Humboldt Personal Narr. Trav. Amer. I. ii. 102 I consider even the pearlstone as an unvitrified obsidian. 1920 A. W. Grabau Textbk. Geol. I. vi. 98 Perlite, or pearl stone... This is glass composed of numerous rounded masses, with concentric structure like the coats of an onion, formed by contraction in cooling and separated by larger straight cracks. 1940 F. F. Grout Handbk. Rocks (ed. 6) v. 102 The perlites have usually 2–4 per cent of water. The word is also written pearlstone, and was suggested by the fancied resemblance of the concentric shells to the familiar gem. 1999 Mining Jrnl. (Nexis) 5 Nov. 206 M&S presented a business plan with recommendations on the formation of production using non-metallic mineral materials, including basalt, clay, diatomite, quartz, pearlstone and mineral filling agents. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1806
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