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Agate is a variety of chalcedony with multi-colored curved or angular banding. Fire agate shows iridescent phenomena on a brown background;

Mtorolite is a green variety of chalcedony, which has been colored by chromium. Also known as chrome chalcedony, It is principally found in Zimbabwe.

finely grained, dense jasper contains up to twenty percent foreign materials that determine its color, streak and appearance.

Aventurine is a form of chalcedony, characterised by its translucency and the presence of platy mineral inclusions that give a shimmering or glistening effect termed aventurescence.

Jasper is usually considered a chalcedony, but put by scientists in a group by itself because of its grainy structure.

You will immediately recognize the Grade A quality of our Black Onyx beads the second you lay eyes on them! Onyx is a type of banded stone whose bands are often black or white, but can be almost any color. Sardonyx is a variant that has sard, or shades of red, color bands. Visit http://www.auntiesbeads.com/onyx-beads.html to learn more! #onyx #gemstones #gemstone #beads #beadedjewelry #beaders #auntiesbeads #jewelrydesign #black #jewelry #handmadejewelry