Opal
id:
opal-181-17867739
title:
Opal
text:
Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. The name opal is believed to be deri
brand slug:
wiki
category slug:
encyclopedia
description:
Hydrated amorphous form of silica
original url:
https://en.wikipedia.org/wiki/Opal
date created:
2002-06-01T17:24:24Z
date modified:
2024-09-06T00:32:49Z
main entity:
{"identifier":"Q171058","url":"https://www.wikidata.org/entity/Q171058"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/f/fa/Opal-53714.jpg","width":600,"height":392}
fields total:
13
integrity:
16