- Gemstone - Glassy volcanic rock - Igneous rock - A kind of glass produced by volcanoes. It is usually of a
black color, and opaque, except in thin splinters.
- Igneous rock - A basic, dark-colored, holocrystalline, igneous rock,
consisting essentially of a triclinic feldspar and pyroxene with
magnetic iron; -- often limited to rocks pretertiary in age. It
includes part of what was early called greenstone.
- Igneous rock - An igneous, crystalline in structure, consisting
essentially of a triclinic feldspar and hornblende. It includes part of
what was called greenstone.
- Black lava rock - Igneous rock - Volcanic rock - A rock of igneous origin, consisting of augite and
triclinic feldspar, with grains of magnetic or titanic iron, and also
bottle-green particles of olivine frequently disseminated. - An imitation, in pottery, of natural basalt; a kind of
black porcelain.
- A Hard Building Stone - extremely hard rock - Igneous rock - Igneous rock derails train, e.g. - Quartz rock - Type of rock - A crystalline, granular rock, consisting of quartz,
feldspar, and mica, and usually of a whitish, grayish, or flesh-red
color. It differs from gneiss in not having the mica in planes, and
therefore in being destitute of a schistose structure.
- Flowing volcanic rock - Heated up-swell back in a valley - Hot issue? NO point to naval uprising - Hot stuff in back in Avalon - Igneous volcanic rock - Kind of lamp that would interest a volcanologist? - Magma