greisenn.
/ˈɡrʌɪz(ə)n/ Mineralogy.
A granitic rock with crystalline-granular texture, consisting chiefly of quartz and mica.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > granite > varieties of
moorstone1461
silver stone1758
granitell1794
granitoid1794
rapakivi1794
ophthalmite1811
protogine1823
pegmatite1824
potash-granite1845
beresite1849
granitite1875
greisen1878
trowlesworthite1884
microgranite1888
charnockite1893
alaskite1900
Dartmoor granite1904
plagiogranite1959
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 312 Greisen, a compound of quartz and mica.
1879 F. Rutley Study of Rocks xii. 211 Greisen is a granular-crystalline rock, consisting of quartz and mica, the latter usually lithia-mica.
Derivatives
ˈgreisening n.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > metamorphism > [noun] > pneumatolysis
pneumatolysis1896
greisening1907
greisenization1934
1907 C. Reid & J. S. Flett Geol. Land's End District iv. 58 There is not much evidence to show whether the tourmalinisation preceded, accompanied or followed the greisening.
1920 A. Holmes Nomencl. Petrol. 114 The process whereby igneous emanations transform granite into greisen is called greisening or greisenisation.
1962 W. T. Huang Petrol. iv. 97 Three main types of alteration primarily due to the action of volatiles or pneumatolysis are connected with the intrusion of granitic plutons. They are tourmalinization, greisening, and kaolinization.
greiseniˈzation n. the pneumatolytic conversion of granite of similar rocks into greisen.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > metamorphism > [noun] > pneumatolysis
pneumatolysis1896
greisening1907
greisenization1934
1934 Q. Jrnl. Geol. Soc. 90 348 Greisenization is always regarded as a typical example of pneumatolysis.
1970 Mineral. Abstr. XXI. 39/2 The author discusses the chemical changes involved in greisenization.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2021).
<
n.1878