Lapidary Rough / Opal -- Unconventional Lapidarist Shopping Cart

<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/Category685>Lapidary Rough</A> / 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/Category708 TITLE="Blue Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/blue-opal-rough.jpg" ALIGN=left ALT="Blue Opal" NAME="Blue Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category708 TITLE="Blue Opal">Blue Opal</A> <A HREF=http://store.unconventionallapidarist.com/Category709 TITLE="Green Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/green-opal-rough.jpg" ALIGN=left ALT="Green Opal" NAME="Green Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category709 TITLE="Green Opal">Green Opal</A> <A HREF=http://store.unconventionallapidarist.com/Category1284 TITLE="Opalite"><IMG SRC="https://store.nexternal.com/lapidarist/images/opalite-rough.jpg" ALIGN=left ALT="Opalite" NAME="Opalite" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category1284 TITLE="Opalite">Opalite</A> <LI><A HREF=http://store.unconventionallapidarist.com/Category1258 TITLE="Other">Other</A> <A HREF=http://store.unconventionallapidarist.com/Category1113 TITLE="Other Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/other-opal-rough.jpg" ALIGN=left ALT="Other Opal" NAME="Other Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category1113 TITLE="Other Opal">Other Opal</A> <A HREF=http://store.unconventionallapidarist.com/Category710 TITLE="Pink Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/pink-opal-rough.jpg" ALIGN=left ALT="Pink Opal" NAME="Pink Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category710 TITLE="Pink Opal">Pink Opal</A> <A HREF=http://store.unconventionallapidarist.com/Category711 TITLE="Precious Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/precious-opal-specimen.jpg" ALIGN=left ALT="Precious Opal" NAME="Precious Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category711 TITLE="Precious Opal">Precious Opal</A> <A HREF=http://store.unconventionallapidarist.com/Category712 TITLE="Yellow Opal"><IMG SRC="https://store.nexternal.com/lapidarist/images/yellow-opal-rough.jpg" ALIGN=left ALT="Yellow Opal" NAME="Yellow Opal" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Category712 TITLE="Yellow Opal">Yellow Opal</A> <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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