Many of the hollow agates of Brazil and Uruguay contain a crop of amethyst-crystals in the interior.

Garnets are plentiful in the Lindi district, and agates, topaz, moonstone and other precious stones are found in the colony.

The remaining mineral products include lead, from which a considerable quantity of silver is extracted, copper, cobalt, arsenic, the rarer metal cadmium, alum, brown coal, marble, and a few of the commoner precious stones, jaspers, agates and amethysts.

It is famous for the cutting and setting of agates and other precious stones, an industry which has been established here, and in the neighbouring township of Idar, since the 16th century.

All the spandrils of the Taj, all the angles and more important architectural details, are heightened by being inlaid with precious stones such as agates, bloodstones, jaspers and the like.

The diamonds of this district are noted for their purity and lustre, and are generally associated with other crystals - garnets, agates, quartz and chalcedonies.

When cut and polished agates are among the most beautiful of semi-precious stones.

many agates are naturally colored, others are stained for decorative effect.

Agates: Treasures of the Earth is the first popular guide to these beautiful gemstones.

Agates may also be found in the tertiary basalt lavas of some areas on the west coast.

The whole palette of colors is represented from the palest of pastel pink found in rose quartz through to the deep hues of onyx and agates.

The type of gemstone will vary from precious stones such as diamonds, emeralds and rubies, through to semi-precious stones such as agates and quartz.

Popular stones used for tumble polishing are agates and quartzes.