isopyren.
/ˈʌɪsəʊpʌɪə/ Mineralogy.
An impure variety of opal, containing admixtures of alumina, sesquioxide of iron, and lime.
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
1827 Edinb. New Philos. Jrnl. 3 264 The lustre of isopyre is less bright and glassy than that of obsidian.
1883 G. F. Kunz Amer. Gems in Min. Resources U.S. 493 Isopyre is found in small veins from one to three inches in width.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018).
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