(archaic) A jade or nephrite stone.

(US) Synonym of philosopher's stone

A magical crystal for divination.

A reddish-brown variety of stone found in Ceylon, sometimes cut for jewellery.

(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