Mineral Specimens / Chrysoprase -- 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/Category866>Mineral Specimens</A> / Chrysoprase</H1></TD> </TR> </TABLE> Chrysoprase or chrysophrase is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Its color is normally apple-green, but varies to deep green. The darker varieties of chrysoprase are also referred to as prase. (However, the term prase is also used to describe chlorite-included quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.) Chrysoprase is cryptocrystalline, which means that it is composed of crystals so fine that they cannot be seen as distinct particles under normal magnification. This sets it apart from rock crystal, amethyst, citrine, and the other varieties of crystalline quartz which are basically transparent and formed from easily recognized six-sided crystals. Other members of the cryptocrystalline silica family include agate, carnelian, and onyx. Unlike many non-transparent silica minerals, it is the color of chrysoprase, rather than any pattern of markings, that makes it desirable. The word chrysoprase comes from the Greek chrysos meaning 'gold' and prason, meaning 'leek'. Unlike emerald which owes its green color to the presence of chromium, the color of chrysoprase is due to trace amounts of nickel compounds in form of very small inclusions. The nickel reportedly occurs as different silicates, like kerolite or pimelite (not NiO mineral, bunsenite, as was reported before). Chrysoprase results from the deep weathering or lateritization of nickeliferous serpentinites or other ultramafic ophiolite rocks. In the Australian deposits, chrysoprase occurs as veins and nodules with brown goethite and other iron oxides in the magnesite-rich saprolite below an iron and silica cap. As with all forms of chalcedony, chrysoprase has a hardness of 6 - 7 on the Mohs hardness scale and a conchoidal fracture like flint. The best known sources of chrysoprase are Queensland, Western Australia, Germany, Poland, Russia, Arizona, California, and Brazil. The chrysoprase and Ni silicate ore deposit in Szklary, Lower Silesia, Poland, was probably the biggest European chrysoprase occurrence and possibly also the biggest in the world. 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/Chrysoprase" class="external text" href="http://en.wikipedia.org/wiki/Chrysoprase">Wikipedia article "Chrysoprase"</a> <A HREF=http://store.unconventionallapidarist.com/Product12596 TITLE="Chrysoprase Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1031-01.jpg" ALIGN=left ALT="Chrysoprase Specimen" NAME="Chrysoprase Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product12596 TITLE="Chrysoprase Specimen">Chrysoprase Specimen</A> -- <STRIKE>$12.00</STRIKE> $8.40 -- Chrysoprase Specimen( 2.7" x 2" x 0.6" ) <A HREF=http://store.unconventionallapidarist.com/Product11187 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1006-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11187 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$10.00</STRIKE> $7.00 -- Tanzania Chrysoprase Mineral Specimen ( 1.8" x 1.4" x .78" ) <A HREF=http://store.unconventionallapidarist.com/Product11188 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1007-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11188 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$9.00</STRIKE> $6.30 -- Tanzania Chrysoprase Mineral Specimen ( 1.7" x 1.1" x .81" ) <A HREF=http://store.unconventionallapidarist.com/Product11191 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1010-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11191 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$13.00</STRIKE> $9.10 -- Tanzania Chrysoprase Mineral Specimen ( 1.9" x 1.4" x .72" ) <A HREF=http://store.unconventionallapidarist.com/Product11193 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1012-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11193 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$42.00</STRIKE> $29.40 -- Tanzania Chrysoprase Mineral Specimen ( 2.9" x 1.9" x 1.2" ) <A HREF=http://store.unconventionallapidarist.com/Product11196 TITLE="Tanzania Chrysoprase Mineral 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HREF=http://store.unconventionallapidarist.com/Product11199 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1018-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11199 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$9.00</STRIKE> $6.30 -- Tanzania Chrysoprase Mineral Specimen ( 2.1" x 1.7" x .35" ) <A HREF=http://store.unconventionallapidarist.com/Product11200 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1019-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11200 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$14.00</STRIKE> $9.80 -- Tanzania Chrysoprase Mineral Specimen ( 2" x 1.3" x .73" ) <A HREF=http://store.unconventionallapidarist.com/Product11201 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1020-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11201 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$16.00</STRIKE> $11.20 -- Tanzania Chrysoprase Mineral Specimen ( 2.7" x 2.6" x .42" ) <A HREF=http://store.unconventionallapidarist.com/Product11202 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1021-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11202 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$17.00</STRIKE> $11.90 -- Tanzania Chrysoprase Mineral Specimen ( 1.9" x 1.5" x 1.1" ) <A HREF=http://store.unconventionallapidarist.com/Product11203 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1022-03.jpg" ALIGN=left ALT="Tanzania Chrysoprase Mineral Specimen" NAME="Tanzania Chrysoprase Mineral Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product11203 TITLE="Tanzania Chrysoprase Mineral Specimen">Tanzania Chrysoprase Mineral Specimen</A> -- <STRIKE>$13.00</STRIKE> $9.10 -- Tanzania Chrysoprase Mineral Specimen ( 2.5" x 1.1" x .88" ) <A HREF=http://store.unconventionallapidarist.com/Product11204 TITLE="Tanzania Chrysoprase Mineral Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/chrymnrl1023-03.jpg" ALIGN=left 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