Schist, a rock having a slaty structure.
Scientist, a person noted for his profound knowledge.
Sediment, the matter which subsides to the bottom.
Semitic, pertaining to one of the families of nations, or languages, and so named from its members being ranked as the descendants of Shem.
Serpentine, a soft, massive stone, in color dark to light green.
Siliceous, containing silica, or flinty matter.
Simian, a name given to the various tribes of monkeys.
Squamous, the anterior and upper part of the temporal bone, scale-like in form.
Stalagmite, a deposit of earthy matter, made by calcareous water dropping on the floors of caverns.
Stratified, formed or deposited in layers.