(mineralogy) A harmotome. / staurolite / chiastolite

Alternative form of jewstone

(obsolete) A turquoise. / (obsolete) Novaculite, a kind of oilstone brought from Turkey and used for whetstones.

(historical) A form of black lava quarried in the Rhine Valley and used for millstones. / (historical) A millstone made from this substance.

Alternative form of stonehard

Synonym of satin spar

plural of stone falcon

A species of hawk or falcon which builds its nest among the rocks.

stony coral

Mineral coal, as opposed to charcoal / Any hard coal. / Anthracite.