Designer Cabochons / Rhyolite -- 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/Category667>Designer Cabochons</A> / Rhyolite</H1></TD> </TR> </TABLE> Rhyolite is an igneous, volcanic (extrusive) rock, of felsic (silicon-rich) composition (typically >69% SiO2 — see the TAS classification). It may have any texture from aphanitic to porphyritic. The mineral assemblage is usually quartz, alkali feldspar and plagioclase (in a ratio > 1:2 — see the QAPF diagram). Biotite and hornblende are common accessory minerals. Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcroppings of it often bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They can also occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice. Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra or of ignimbrites. This article is licensed under the <a target="_blank" rel="nofollow" title="http://www.gnu.org/copyleft/fdl.html" class="external text" href="http://www.gnu.org/copyleft/fdl.html">GNU Free Documentation License</a>. It uses material from the <a target="_blank" rel="nofollow" title="http://en.wikipedia.org/wiki/Rhyolite" class="external text" href="http://en.wikipedia.org/wiki/Rhyolite">Wikipedia article "Rhyolite"</a> <A HREF=http://store.unconventionallapidarist.com/Product19600 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1117.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product19600 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $16.00 -- Rhyolite Designer Cabochons ( 42.5mm x 23.5mm x 3mm ) <A HREF=http://store.unconventionallapidarist.com/Product19601 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1118.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product19601 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $21.00 -- Rhyolite Designer Cabochons ( 56.5mm x 29mm x 5.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product19602 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1119.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product19602 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $16.00 -- Rhyolite Designer Cabochons ( 42mm x 29mm x 4.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product22692 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1129.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product22692 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $16.00 -- Rhyolite Designer Cabochons ( 41.5mm x 29.5mm x 4.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product22694 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1131.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product22694 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $16.00 -- Rhyolite Designer Cabochons ( 42mm x 29mm x 7mm ) <A HREF=http://store.unconventionallapidarist.com/Product24055 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1133.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24055 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $68.00 -- Rhyolite Designer Cabochons ( 37.5mm x 23.5mm x 6mm ) <A HREF=http://store.unconventionallapidarist.com/Product24122 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1134.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24122 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $11.00 -- Rhyolite Designer Cabochons ( 21mm x 21.5mm x 5.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product24123 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1135.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24123 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $24.00 -- Rhyolite Designer Cabochons ( 34.5mm x 31mm x 6.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product24124 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1136.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24124 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $11.00 -- Rhyolite Designer Cabochons ( 24.5mm x 14.5mm x 5.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product24125 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1137.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24125 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $22.00 -- Rhyolite Designer Cabochons ( 37.5mm x 24mm x 6.5mm ) <A HREF=http://store.unconventionallapidarist.com/Product24126 TITLE="Rhyolite Designer Cabochons"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1138.jpg" ALIGN=left ALT="Rhyolite Designer Cabochons" NAME="Rhyolite Designer Cabochons" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product24126 TITLE="Rhyolite Designer Cabochons">Rhyolite Designer Cabochons</A> -- $24.00 -- Rhyolite Designer Cabochons ( 34mm x 30mm x 4mm ) <A HREF=http://store.unconventionallapidarist.com/Product19125 TITLE="Rhyolite Designer Cabs"><IMG SRC="https://store.nexternal.com/lapidarist/images/t_rhyocabs1108.jpg" ALIGN=left ALT="Rhyolite Designer Cabs" NAME="Rhyolite Designer Cabs" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product19125 TITLE="Rhyolite Designer Cabs">Rhyolite Designer Cabs</A> -- $18.00 -- Rhyolite Designer Cabs ( 57.2mm x 25.7mm x 4.5mm ) <A HREF="http://store.unconventionallapidarist.com" TITLE="Unconventional Lapidarist Products">Unconventional Lapidarist Products</A> <A 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