hälleflintan.
/hɛləˈflɪntə/ Mineralogy.
A name given to a very fine-grained variety of gneiss, generally free from mica, and resembling felsite.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > gneiss > varieties of
ferberite1811
hälleflinta1878
orthogneiss1902
paragneiss1902
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 213 Felsite has also received the names of petrosilex, and in Scandinavia hälle-flinta.
1879 F. Rutley Study of Rocks xii. 214 Those varieties termed hälleflinte and hornstone having a peculiar flinty aspect.
1880 Academy 20 Nov. 370 The Chinese Rocks are allied to hälleflinta.
Derivatives
hälleflintoid adj. of or like hälleflinta.
ΚΠ
1888 Blake in Q. Jrnl. Geol. Soc. 44 280 Some more hälleflintoid rock (well shown in a quarry by the roadside).
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018).
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