BASALTS
Noun
basalts
plural of basalt
Source: Wiktionary
BASALT
Ba*salt", n. Etym: [N. basaltes (an African word), a dark and hard
species of marble found in Ethiopia: cf. F. basalte.]
1. (Geol.)
Definition: 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.
Note: It is usually of a greenish black color, or of some dull brown
shade, or black. It constitutes immense beds in some regions, and
also occurs in veins or dikes cutting through other rocks. It has
often a prismatic structure as at the Giant's Causeway, in Ireland,
where the columns are as regular as if the work of art. It is a very
tough and heavy rock, and is one of the best materials for
macadamizing roads.
2. An imitation, in pottery, of natural basalt; a kind of black
porcelain.
Source: Webster’s Unabridged Dictionary 1913 Edition