Originally: a hard, strong rock or mineral, not otherwise identified, to which various other (often contradictory) properties were attributed. In…

= adamant, n. 1a. Obsolete.

(a) = sense A. 2a; (b) = sense A. 1.

= chrysocolla, n. 1.

A name meaning ‘gold-solder’, anciently given to some mineral or minerals; it may have included borax, to which the name was in later times…

A mineral (not identified) held to resemble the drug. Obsolete. rare.

some mineral.

A mineral consisting of hydrated aluminium oxide, white or pale yellow, grey, or violet in colour, which occurs typically as platy or elongated…

A yellowish-green crystalline mineral containing iron, perhaps a form of olivine.

A green or brownish-red mineral of uncertain identity (perhaps an altered form of rhodonite) consisting of a silicate and carbonate of manganese.

Mineralogy. A concretionary substance found in small spherular masses in certain rocks. Obsolete.

In the classification of Beudant: a mineral containing alumina as a main component.

A soft, rose-coloured or blood red clay mineral originally found in Northern Ireland.

A rare bismuth-containing mineral, typically occurring as grey needle-shaped crystals. Also called needle ore.

A reddish-brown amorphous mineral found in pegmatites which is an altered or metamict variety of zircon, with elevated concentrations of hafnium…

A mineral produced by alteration or decomposition of sphene or titanite: see quot. 1856.

= aikinite, n. Obsolete. rare.

A titanium-containing mineral occurring as long prismatic crystals of a black or dark brown colour, typically as a constituent of pegmatites.

Microscopic dark grains and scales occurring in the groundmass of many igneous rocks, which are too small to be readily identified by optical…

A mineral compound occurring in certain rocks in the form of minute greenish particles.

A copper silicate mineral occurring as blue platy crystals in the fumaroles of Vesuvius; now regarded as identical with litidionite.

A yellow iron mineral occurring in very arid regions, typically as masses of needle-shaped crystals.

A mineral containing lead, bismuth, selenium, and sulphur and occurring as grey monoclinic crystals.

A hexagonal mineral consisting of platinum and tin, and occurring as silver-white metallic grains, esp. at Ntsizwa in the Eastern Cape province…

A copper-containing mineral, typically occurring as pale greenish-blue crystals or encrustations.

A nickel silicide, (Ni,Fe)5(Si,P)2, that has been found in several meteorites.

A substance found on the moon as glassy fragments and as a constituent of fines and breccias, characterized by a high content of potassium…