Clay = Black (Terra Nigra, Roman) Return to START , ROCK AND MINERALS OF COLOR MOHS SCALE OF HARDNESS 1 Talc, 2 Gypsum, 3 Calcite, 4 Fluorite, 5 Apatite, 6 Feldspar, 7 quartz, 8 Topaz, 9 Corundum, 10 Diamond BASALT Basalt is the most common of the earth's volcanic rocks, its crystals are continuous and elongated.
(its crystals; are; continuous and elongated) Context(its crystals are,List([272, 288))):(10 Diamond BASALT Basalt; is; the most common of the earth's volcanic rocks)
its crystals are,List([272, 288))
its crystals 10 Diamond BASALT Basalt
are is
continuous and elongated
the most common of the earth's volcanic rocks