Obsidian vs. Onyx

Obsidiannoun

(mineral) A type of black glass produced by volcanoes.

Obsidianadjective

(poetic) black

Obsidiannoun

A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.

Obsidiannoun

acid or granitic glass; usually dark, but transparent in thin pieces

Obsidian

Obsidian () is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock.Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.

Onyxnoun

(mineral) A banded variety of chalcedony, a cryptocrystalline form of quartz.

Onyxnoun

A jet-black color, named after the gemstone.

Onyxadjective

jet-black

Onyxnoun

Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground.

Onyxnoun

Same as Mexican onyx.

Onyxnoun

A deep jet-black color.

Onyxadjective

Deep, jet-black.

Onyxnoun

a chalcedony with alternating black and white bands; used in making cameos

Onyxnoun

a semi-precious variety of agate with different colours in layers

Onyx

Onyx primarily refers to the parallel banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands.