phacoliten.

1843 J. E. Portlock Rep. Geol. Londonderry 219 Levyne (? Phakolite) occurs in double six-sided prisms.

1846 Proc. Boston Soc. Nat. Hist. 2 87 (title) Notes on certain minerals; phacolite, yttrocerite, ottrelite, polyadelphite.

1880 Academy 21 Aug. 139/1 The occurrence of the zeolites, phacolite, and phillipsite, in cavities of basaltic rocks containing liquid.

1892 Amer. Naturalist 26 56 The optical anomalies of phacolite and chabazite are ascribed to the same causes as those assigned to the anomalies of analcite.

1987 Mineral. Mag. 51 427 Phacolite from Mitaki Sendai City, Japan, has a core of penetration-twinned chabazite.

1909 A. Harker Nat. Hist. Igneous Rocks iii. 77 A concurrent influx of molten magma will..find its way along the crests and troughs of the wave-like folds. Intrusive bodies corresponding more or less closely with this ideal case are common in folded districts. Since some distinctive name seems to be needed, we may call them phacolites... The intrusions..are not, like true laccolites, the cause of the attendant folding, but rather a consequence of it.

1937 S. W. Wooldridge & R. S. Morgan Physical Basis Geogr. viii. 109 Phacolites are lens-shaped masses of rock occupying the saddles of anticlines or the heels of synclines, places where rigid rock sheets naturally gape apart in the folding process.

1946 L. D. Stamp Britain's Struct. & Scenery ix. 80 A special type of sill is one where the lava swells out to form a lens-shaped mass—which according to its particular form is known as a laccolite (with a flat base) or a phacolite (with a curved base).