pitchstonen.

Brit.

/ˈpɪtʃstəʊn/, U.S.

/ˈpɪtʃˌstoʊn/

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

Etymology: < pitch n.¹ + stone n. Compare post-classical Latin lapis piceus (1729 or earlier), German Pechstein (1759; earlier in sense ‘lump of pitch’ (1493)).

1. Geology. A dull vitreous rock resembling hardened pitch, formed by partial hydration of obsidian.

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

a1728 J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) 165 Lapis Piceus, or Pitch-Stone.

1798 R. Jameson Outl. Mineral. Shetland Islands ii. i. 55 In some parts of the vein, the pitchstone, as it approaches the sandstone, loses much of its lustre, and, in fracture and hardness, approaches to the nature of basalt.

1807 J. Headrick View Mineral. Arran 58 On the northern declivity saw many masses of pitchstone.

1832 W. Macgillivray Trav. & Researches A. von Humboldt iii. 51 Lavas with a basis of pitch-stone and obsidian.

1894 Times 11 Aug. 11/2 Invaded by the pitchstone-lava of the island of Eigg.

1954 J. F. Kirkaldy Gen. Princ. Geol. xii. 169 They grade into the volcanic glasses, obsidian, which is dense black and had a markedly conchoidal fracture and pitchstone, which contains many minute crystals and is of variegated hue.

1984 Times 30 Aug. 10/7 Pitchstone is a blackish-green volcanic glass, which looks a bit like a broken bottle when chipped.

†2. Mineralogy. = resin opal n. at resin n. and adj. Compounds 2. Obsolete.

ΘΚΠ

society > occupation and work > materials > raw material > gem or precious stone > opal > [noun] > varieties of

girasol1588

oculus mundi1661

eye of the world1730

hydrophane1784

cacholong1791

pitchstone1794

pyrophane1794

semi-opal1794

fire opal1811

sun opal1818

isopyre1827

alumocalcite1832

jasper-opal1843

opal jasper1848

resin opal1850

pitch opal1861

jasp-opal1868

opal-agate1868

harlequin1873

harlequin opal1887

wax-opal1896

potch1897

pinfire1902

moss opal1904

nobby1919

the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > quartz > amorphous quartz or opal > others

girasol1588

oculus mundi1661

hydrophane1784

cacholong1791

pitchstone1794

pyrophane1794

semi-opal1794

wood-stone1794

fire opal1811

wood-opal1816

sun opal1818

isopyre1827

jasper-opal1843

opal jasper1848

resin opal1850

natural glass1853

pitch opal1861

vitrite1866

jasp-opal1868

opal-agate1868

pearl opal1872

harlequin1873

harlequin opal1887

wax-opal1896

potch1897

moss opal1904

nobby1919

1794 R. Kirwan Elements Mineral. (ed. 2) I. 292 Pitchstone... It often much resembles semi opals and jaspers.

Compounds

pitchstone porphyry n. Geology now rare a porphyritic pitchstone.

ΚΠ

1799 R. Kirwan Geol. Ess. 180 Huge strata..as they contain abundance of quartz and felspar may be called pitchstone porphyry.

1839 Jrnl. Royal Geogr. Soc. 9 266 Near the mosque of Naháden was a mass of pitchstone porphyry hewn into a singular form, similar to that of a baptismal font.

1883 Chambers's Encycl. VII. 690 Crystals of felspar, quartz, or calcareous spar, disseminated through a base of greenstone, form a greenstone porphyry. In the same way, there are pitchstone porphyry, basaltic porphyry, claystone porphyry, etc.

1932 A. Johannsen Descr. Petrogr. Igneous Rocks II. 282 The porphyritic pitchstones, normal vitrophyres, are also called pitchstone-porphyries.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	pitchstone
释义	pitchstonen. Brit. /ˈpɪtʃstəʊn/, U.S. /ˈpɪtʃˌstoʊn/ Origin: Formed within English, by compounding. Etymons: pitch n.¹, stone n. Etymology: < pitch n.¹ + stone n. Compare post-classical Latin lapis piceus (1729 or earlier), German Pechstein (1759; earlier in sense ‘lump of pitch’ (1493)). 1. Geology. A dull vitreous rock resembling hardened pitch, formed by partial hydration of obsidian. 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 a1728 J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) 165 Lapis Piceus, or Pitch-Stone. 1798 R. Jameson Outl. Mineral. Shetland Islands ii. i. 55 In some parts of the vein, the pitchstone, as it approaches the sandstone, loses much of its lustre, and, in fracture and hardness, approaches to the nature of basalt. 1807 J. Headrick View Mineral. Arran 58 On the northern declivity saw many masses of pitchstone. 1832 W. Macgillivray Trav. & Researches A. von Humboldt iii. 51 Lavas with a basis of pitch-stone and obsidian. 1894 Times 11 Aug. 11/2 Invaded by the pitchstone-lava of the island of Eigg. 1954 J. F. Kirkaldy Gen. Princ. Geol. xii. 169 They grade into the volcanic glasses, obsidian, which is dense black and had a markedly conchoidal fracture and pitchstone, which contains many minute crystals and is of variegated hue. 1984 Times 30 Aug. 10/7 Pitchstone is a blackish-green volcanic glass, which looks a bit like a broken bottle when chipped. †2. Mineralogy. = resin opal n. at resin n. and adj. Compounds 2. Obsolete. ΘΚΠ society > occupation and work > materials > raw material > gem or precious stone > opal > [noun] > varieties of girasol1588 oculus mundi1661 eye of the world1730 hydrophane1784 cacholong1791 pitchstone1794 pyrophane1794 semi-opal1794 fire opal1811 sun opal1818 isopyre1827 alumocalcite1832 jasper-opal1843 opal jasper1848 resin opal1850 pitch opal1861 jasp-opal1868 opal-agate1868 harlequin1873 harlequin opal1887 wax-opal1896 potch1897 pinfire1902 moss opal1904 nobby1919 the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > quartz > amorphous quartz or opal > others girasol1588 oculus mundi1661 hydrophane1784 cacholong1791 pitchstone1794 pyrophane1794 semi-opal1794 wood-stone1794 fire opal1811 wood-opal1816 sun opal1818 isopyre1827 jasper-opal1843 opal jasper1848 resin opal1850 natural glass1853 pitch opal1861 vitrite1866 jasp-opal1868 opal-agate1868 pearl opal1872 harlequin1873 harlequin opal1887 wax-opal1896 potch1897 moss opal1904 nobby1919 1794 R. Kirwan Elements Mineral. (ed. 2) I. 292 Pitchstone... It often much resembles semi opals and jaspers. Compounds pitchstone porphyry n. Geology now rare a porphyritic pitchstone. ΚΠ 1799 R. Kirwan Geol. Ess. 180 Huge strata..as they contain abundance of quartz and felspar may be called pitchstone porphyry. 1839 Jrnl. Royal Geogr. Soc. 9 266 Near the mosque of Naháden was a mass of pitchstone porphyry hewn into a singular form, similar to that of a baptismal font. 1883 Chambers's Encycl. VII. 690 Crystals of felspar, quartz, or calcareous spar, disseminated through a base of greenstone, form a greenstone porphyry. In the same way, there are pitchstone porphyry, basaltic porphyry, claystone porphyry, etc. 1932 A. Johannsen Descr. Petrogr. Igneous Rocks II. 282 The porphyritic pitchstones, normal vitrophyres, are also called pitchstone-porphyries. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.a1728
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