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A piece of magnetic iron ore possessing polarity like a magnetic needle. See Magnetite.

Same as Loadstone.

Amygdaloid.

A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England.

A stone designating a limit or boundary; a landmark. Bacon.

A stone serving the same purpose as a milepost.

One of two circular stones used for grinding grain or other substance. No man shall take the nether or the upper millstone to pledge. Deut. xxiv. 6.

A block of black basalt, found at Dibon in Moab by Rev. F. A. Klein, Aug. 19, 1868, which bears an inscription of thirty-four lines, dating from the 9th century b. c., and written in the Moabite alphabet, the oldest Phonician type of the Semitic alphabet. It records the victories of Mesha, king of Moab, esp. those over…

A nearly pellucid variety of feldspar, showing pearly or opaline reflections from within. It is used as a gem. The best specimens come from Ceylon.

A species of English granite, used as a building stone.

The ketone of myristic acid, obtained as a white crystalline substance.

Natrolite; -- called also needle zeolite.

A variety of hone slate, or whetstone, used for whetting tools when lubricated with oil.

A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic.

Pisolite.

A pebble; also, pebbles collectively. "Chains of pebblestone." Marlowe.

See Perpender.

See Perpender.

A kind of clay slate, carved by the Indians into tobacco pipes. Cf. Catlinite.

An igneous rock of semiglassy nature, having a luster like pitch.