1897 Amer. Ann. Deaf June 265In the Indiana Institution experiments are in progress with the ‘lamprophoner’, an instrument which..increases the intensity of sound.
1899 E. S. Dana Dana'sSyst. Min. (ed. 6) 1stApp. 40Lamprophyllite... A mineral related to astrophyllite in form and cleavage.
1942 Amer. Mineralogist XXVII. 416The Bearpaw and Kola lamprophyllite are almost identical in refringence, habit, and orientation.
1965 Scientia Sinica (Peking) XIV. 1839 The lamprophyllite in general belongs to the monoclinic system and the orthorhombic lamprophyllite exists as a submicroscopic crystallite in the polysynthetic twin of monoclinic lamprophyllite.
1890 Mineral Mag. IX. 43The rock..is most closely paralleled by the olivine-bearing lamprophyres.
1923 Geol. Mag. LX. 553The potash series of lamprophyres, in which orthoclase and abundance of biotite form the expression of excess of potash over soda, is not so complex a group as that of the soda-lamprophyres.
1959 W. W. Moorhouse Study of Rocks in Thin Section xvii. 325Lamprophyres..are for the most part melanocratic to mesotype rocks... Nearly all..of the true lamprophyres are characterized by a definitely alkaline aspect, indicated by the presence of abundant biotite, alkali feldspar, soda pyriboles, nepheline, or analcite, combined with a low silica content.
1966 Jrnl. &Proc. R.Soc. New South Wales XCIX. 38/1Many of the common lamprophyres, such as minettes, vogesites, kersantites and spessartites are almost chemically identical.
1892 Geol. Mag. IX. 201An intermixture of the acid and lamprophyric magmas took place during the injection.
1965 G. J. Williams Econ. Geol. N.Z. xiii. 205/1Narrow lamprophyric dykes and sills cut granite, Ohika beds and the Breccia.
1875 Knight Dict. Mech. ,Lamprotype (Photography), a polished collodion picture.
lampro-
combining form
Etymology: New Latin, from Greek, from lampros bright, from lampein to give light, shine — more at lamp
: bright
< lamprophyre >
< lamprophyre >