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长石岩类[Feldspathoid]

   ℃〖化学〗2005-7-6 20:28
<P>

A anhydrous framework silicate that are chemically similar to the <a href="Feldspar.html">feldspars</a>. They share the feldspar
structure, but contain only about two-thirds as much silica as alkali feldspars.
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="LEFT">Feldspathoid</TD>
<TD ALIGN="LEFT">Formula</TD>
</TR>
<TR><TD ALIGN="LEFT">lazurite</TD>
<TD ALIGN="LEFT">(Na,Ca)<font size="-1"><sub>8</sub></font>(AlSiO<font size="-1"><sub>4</sub></font>)<font size="-1"><sub>6</sub></font>(SO<font size="-1"><sub>4</sub></font>,S,Cl)<font size="-1"><sub>2</sub></font></TD>
</TR>
<TR><TD ALIGN="LEFT">leucite</TD>
<TD ALIGN="LEFT">KAlSi<font size="-1"><sub>2</sub></font>O<font size="-1"><sub>6</sub></font></TD>
</TR>
<TR><TD ALIGN="LEFT">nepheline</TD>
<TD ALIGN="LEFT">(Na,K)AlSiO<font size="-1"><sub>4</sub></font></TD>
</TR>
<TR><TD ALIGN="LEFT">petalite</TD>
<TD ALIGN="LEFT">Li(AlSi<font size="-1"><sub>4</sub></font>O<font size="-1"><sub>10</sub></font>)</TD>
</TR>
<TR><TD ALIGN="LEFT">sodalite</TD>
<TD ALIGN="LEFT">Na<font size="-1"><sub>8</sub></font>(AlSiO<font size="-1"><sub>4</sub></font>)<font size="-1"><sub>6</sub></font>Cl<font size="-1"><sub>2</sub></font></TD>
</TR>
</TABLE>
</DIV>
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