Mineral Specimens / Psilomelane -- 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> / Psilomelane</H1></TD> </TR> </TABLE> Psilomelane, also known as black hematite, is a group name for hard black manganese oxides such as hollandite and romanechite. Psilomelane consists of hydrous manganese oxide with variable amounts of barium and potassium.<eol><eol><eol><eol><eol><eol><eol><eol><eol> </eol></eol></eol></eol></eol></eol></eol></eol></eol><h2>Formula</h2> Generalized formula may be represented as Ba(Mn2+)(Mn4+)8O16(OH)4 or as (Ba,H2O)2Mn5O10. It is sometimes considered to be a hydrous manganese manganate, but of doubtful composition. The amount of manganese present corresponds to 70-80% of manganous oxide with 10-15% of available <a title="Oxygen" href="http://en.wikipedia.org/wiki/Oxygen">oxygen</a>. <a id="Characteristics" name="Characteristics"></a> <h2> Characteristics</h2> Psilomelane is amorphous and occurs as botryoidal and stalactitic masses with a smooth shining surface and submetallic lustre. The mineral is readily distinguished from other hydrous manganese oxides (manganite and wad) by its greater hardness 5 to 6; the specific gravity varies from 3.7 to 4.7. The streak is brownish black and the fracture smooth. Owing to its amorphous nature, the mineral often contains admixed impurities, such as iron hydroxides. It is soluble in hydrochloric acid with evolution of chlorine gas. 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/Psilomelane" class="external text" title="http://en.wikipedia.org/wiki/Psilomelane" rel="nofollow" target="_blank">Wikipedia article "Psilomelane"</a> <A HREF=http://store.unconventionallapidarist.com/Product15109 TITLE="Psilomelane Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/psilmnrl1002-03.jpg" ALIGN=left ALT="Psilomelane Specimen" NAME="Psilomelane Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product15109 TITLE="Psilomelane Specimen">Psilomelane Specimen</A> -- <STRIKE>$10.00</STRIKE> $7.00 -- Psilomelane Specimen ( 18.2 grams) <A HREF=http://store.unconventionallapidarist.com/Product15110 TITLE="Psilomelane Specimen"><IMG SRC="https://store.nexternal.com/lapidarist/images/psilmnrl1003-03.jpg" ALIGN=left ALT="Psilomelane Specimen" NAME="Psilomelane Specimen" BORDER=0></A> <A HREF=http://store.unconventionallapidarist.com/Product15110 TITLE="Psilomelane 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