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<TABLE BORDER=0 TITLE="Unconventional Lapidarist" SUMMARY="Unconventional Lapidarist"> <TR> <TD><A HREF="http://www.unconventionallapidarist.com" TITLE="Unconventional Lapidarist"><IMG SRC="https://store.nexternal.com/lapidarist/lapidarist-logo-small.jpg" ALT="Unconventional Lapidarist" NAME="Unconventional Lapidarist" BORDER=0></A></TD> <TD>  </TD> <TD><H1><A HREF=http://store.unconventionallapidarist.com/Category814>LIQUIDATION</A> / <A HREF=http://store.unconventionallapidarist.com/Category1185>Opal</A> / Australia Opal</H1></TD> </TR> </TABLE> Opal is a mineraloid gel which 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, and basalt. The water content is usually between three and ten percent, but can be as high as 20%. Opal ranges from clear through white, gray, red, orange, yellow, green, shore, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the reds against black are the most rare and dear, whereas white and greens are the most common; these are a function of growth size into the red and infrared wavelengths—see precious opal. Common opal is truly amorphous, but precious opal does have a structural element. The word opal comes from the Latin opalus, by Greek opallios, and is from the same root as Sanskrit upálá[s] for "stone", originally a millstone with upárá[s] for slab.[4] (see Upal). Opals are also Australia's national gemstone. Opal is one of the mineraloids that can form or replace fossils. The resulting fossils, though not of any extra scientific interest, appeal to collectors. Besides the gemstone varieties that show a play of color, there are other kinds of common opal such as the milk opal, milky bluish to greenish (which can sometimes be of gemstone quality); resin opal, honey-yellow with a resinous luster; wood opal, caused by the replacement of the organic material in wood with opal[6]; menilite brown or grey; hyalite, a colorless glass-clear opal sometimes called Muller's Glass; geyserite, (siliceous sinter) deposited around hot springs or geysers; and diatomite or diatomaceous earth, the accumulations of diatom shells or tests. This article is licensed under the <a href="http://www.gnu.org/copyleft/fdl.html" class="external text" title="http://www.gnu.org/copyleft/fdl.html" rel="nofollow" target="_blank">GNU Free Documentation License</a>. It uses material from the <a href="http://en.wikipedia.org/wiki/Opal" class="external text" title="http://en.wikipedia.org/wiki/Opal" rel="nofollow" target="_blank">Wikipedia article "Opal"</a> <A HREF=http://store.unconventionallapidarist.com/Product18673 TITLE="Lightning Ridge Opal Liquidation"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_opalcabs1104.jpg" ALIGN=left ALT="Lightning Ridge Opal Liquidation" NAME="Lightning Ridge Opal Liquidation" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product18673 TITLE="Lightning Ridge Opal Liquidation">Lightning Ridge Opal Liquidation</A> -- $15.00 -- Lightning Ridge Opal Liquidation ( 8.7mm x 6.4mm x 3.1mm ) <A HREF=http://store.unconventionallapidarist.com/Product18675 TITLE="Lightning Ridge Opal Liquidation"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_opalcabs1106.jpg" ALIGN=left ALT="Lightning Ridge Opal Liquidation" NAME="Lightning Ridge Opal Liquidation" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product18675 TITLE="Lightning Ridge Opal Liquidation">Lightning Ridge Opal Liquidation</A> -- $22.00 -- Lightning Ridge Opal Liquidation ( 8.2mm x 6.4mm x 3.2mm ) <A HREF=http://store.unconventionallapidarist.com/Product18676 TITLE="Lightning Ridge Opal Liquidation"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_opalcabs1107.jpg" ALIGN=left ALT="Lightning Ridge Opal Liquidation" NAME="Lightning Ridge Opal Liquidation" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product18676 TITLE="Lightning Ridge Opal Liquidation">Lightning Ridge Opal Liquidation</A> -- $22.00 -- Lightning Ridge Opal Liquidation ( 10.8mm x 6.7mm x 2.8mm ) <A HREF=http://store.unconventionallapidarist.com/Product18684 TITLE="Lightning Ridge Opal Liquidation"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_opalcabs1115.jpg" ALIGN=left ALT="Lightning Ridge Opal Liquidation" NAME="Lightning Ridge Opal Liquidation" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product18684 TITLE="Lightning Ridge Opal Liquidation">Lightning Ridge Opal Liquidation</A> -- $30.00 -- Lightning Ridge Opal Liquidation ( 9.4mm x 6.3mm x 2.8mm ) <A HREF="http://store.unconventionallapidarist.com" TITLE="Unconventional Lapidarist Products">Unconventional Lapidarist Products</A> <A HREF="http://www.unconventionallapidarist.com">cabochons</A> <A HREF="http://www.unconventionallapidarist.com">designer cabochons</A> <A HREF="http://www.unconventionallapidarist.com">lapidary supplies</A> <A HREF="http://www.unconventionallapidarist.com">gemstones</A> <A HREF="http://www.unconventionallapidarist.com">collector spheres</A> <A HREF="http://www.unconventionallapidarist.com">collector carvings</A> Unconventional Lapidarist Online Store powered by Nexternal <A HREF="http://www.nexternal.com" TITLE="shopping cart software">shopping cart software</A>

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