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agate

agate   Quick reference

World Encyclopedia

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Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
27 words

Microscrystalline form of quartz with parallel bands of colour. It is regarded as a semi-precious stone and is used for

agate

agate   Quick reference

The Concise Oxford Dictionary of Art Terms (2 ed.)

Reference type:
Subject Reference
Current Version:
2010
Subject:
Art & Architecture
Length:
146 words
A fine-grained, banded *chalcedony which can come in all colours in a variety of strengths. It is often an opaque grey which can be sliced and polished to bring out the concentric ... More
agate ware

agate ware  

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*Pottery made to resemble agate. Different coloured clays were combined to imitate the veining of the hard stone. It was made by the Romans and revived in the 18th century in Staffordshire.
chalcedony

chalcedony  

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A mineral consisting of a microcrystalline variety of quartz. It occurs in several forms, including a large number of semiprecious gemstones; for example, sard, carnelian, jasper, onyx, chrysoprase, ...
hardstones

hardstones  

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A general term used to describe a wide variety of stones such as agate, calcite alabasters, jasper, and various marbles used for inlays and small-scale sculpture. See pietre dure.
onyx

onyx  

A mixture of chalcedonic (see chalcedony) silica SiO2 and hydrous silica SiO2.nH2O; occurs as flat, banded varieties with white, grey, brown, red, and black bands.
pietre Dure

pietre Dure  

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The normally used plural of the Italian term for hardstone (pietra dura). Stones such as agate, chalcedony, jasper, and lapis lazuli have been used for small decorative objects since early times. In ...
quartz

quartz  

The most abundant and common mineral, consisting of crystalline silica (silicon dioxide, SiO2), crystallizing in the trigonal system. It has a hardness of 7 on the Mohs' scale. Well-formed crystals ...
sardonyx

sardonyx  

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A layer stone formed from agate, with a brown base and upper white layer, which is usually cut and engraved.

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