RHOMBOHEDRAL CRYSTALS

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=27 BGCOLOR="#006699" TEXT="#080000"> <div> <FONT SIZE="2" COLOR="#FFFFFF" FACE="Arial" ><B>CHEMISTRY SCHOOL</B></FONT><FONT SIZE="1" COLOR="#FFFFCC" FACE="Arial" ><B>   </B></FONT><B>  </B><A HREF="index.htm" TARGET="_top" TITLE="CHEMISTRY SCHOOL"><U>HOME PAGE - INDEX TO THE LESSONS</U></A>             RHOMBOHEDRAL SHAPED •  MOLECULAR CRYSTALS</div> <div> </div> </td> </tr><tr> <td valign="top" width=248 BGCOLOR="#66CCCC" TEXT="#080000"> <div>  <FONT SIZE="1" COLOR="#0000BF" FACE="Arial" >    THE MOLECULAR CRYSTALS</FONT></div> <div>                 <A HREF="crystals.htm" TARGET="_top" TITLE="WHAT ARE CRYSTALS?"><U>INTRODUCTION</U></A></div> <div> <I>> RECTANGULAR FACED CRYSTALS</I></div> <div> 1. <A HREF="cubic_crystals.htm" TARGET="_top" TITLE="CUBIC CRYSTALS"><U>CUBIC CRYSTALS</U></A></div> <div> 2. <A HREF="tetragonal_crystals.htm" TARGET="_top" TITLE="TETRAGONAL CRYSTALS"><U>TETRAGONAL CRYSTALS</U></A></div> <div> 3  <A HREF="orthorhomic_crystal.htm" TARGET="_top" TITLE="SIMPLE ORTHORHOMBIC CRYSTALS"><U>SIMPLE ORTHO-RHOMBIC</U></A> </div> <div> 4. <A HREF="top_centered_orthorhomic_crystals.htm" TARGET="_top" TITLE="TOP CENTERED ORTHORHOMBIC"><U>TOP CENTERED ORTHORHOMBIC</U></A></div> <div> 5. <A HREF="face_centered_crystals.htm" TARGET="_top" TITLE="FACE CENTERED ORTHORHOMBIC"><U>FACE CENTERED ORTHORHOMBIC</U></A> </div> <div> 6. <A HREF="equi_centric_orthorombic.htm" TARGET="_top" TITLE="EQUICENTRIC ORTHORHOMBIC"><U>EQUI-CENTRIC ORTHORHOMBIC</U></A></div> <div> <I>> TRIANGULAR, RHOMBOHEDRAL </I></div> <div> <I>   & HEXAGONAL CRYSTALS </I></div> <div> 1. <A HREF="trigonal_crystals.htm" TARGET="_top" TITLE="TRIGONAL CRYSTALS"><U>TRIGONAL CRYSTALS</U></A></div> <div> 2. <A HREF="tetrahedral_molecular_crystals.htm" TARGET="_top" TITLE="TETRAHEDRAL CRYSTALS"><U>TETRA-HEDRAL  CRYSTALS </U></A></div> <div> 3. <A HREF="hexahedral_crystals.htm" TARGET="_top" TITLE="HEXAHEDRAL CRYSTALS"><U>HEXA-HEDRAL CRYSTALS</U></A></div> <div> 4. <A HREF="octa_hedral_crystals.htm" TARGET="_top" TITLE="OCTAHEDRAL CRYSTALS"><U>OCTA-HEDRAL CRYSTALS</U></A></div> <div> 5. <A HREF="rhombohedral_crystals.htm" TARGET="_top" TITLE="RHOMBOHEDRAL CRYSTALS"><U>RHOMBOHEDRAL CRYSTALS</U></A></div> <div> 6. <A HREF="hexagonal_molecular_crystals.htm" TARGET="_top" TITLE="HEXAGONAL CRYSTALS"><U>HEXAGONAL CRYSTALS</U></A></div> <div> 7  <A HREF="parallelepiped_molecular_crystals.htm" TARGET="_top" TITLE="PARALLELEPIPED CRYSTALS"><U>PARALLELEPIPED CRYSTALS</U></A></div> <bR> <bR> </td> <td valign="top" height=453 BGCOLOR="#66CCCC" TEXT="#080000"> <div> <I>RHOMBOHEDRAL CRYSTALS</I></div> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="1" CELLPADDING="4" CELLSPACING="0" WIDTH="499" BORDERCOLORLIGHT="#993380" BORDERCOLORDARK="#993380" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" BGCOLOR=#FFFFFF > <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 15 WIDTH="479"><div> RHOMBOHEDRAL SHAPED MOLECULAR CRYSTALS</div> </tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 191 ><NOBR><div>    1. A RHOMBOHEDRAL MOLECULAR</div> <div>        CRYSTAL OF 8 EQUAL </div> <div>        CO-VALENTLY BONDED  ATOMS </div> <div>    2. IS A CRYSTAL WITH SIX ACUTE</div> <div>        PARALLEL-O-GRAM SIDES</div> <div>        IN PAIRS OF PARALLEL PLANES</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="106ecaba0.gif" border=0 width="202" height="186" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 193 ><NOBR><div> <IMG SRC="1066afb20.gif" border=0 width="175" height="178" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> <tD VALIGN=CENTER><NOBR><div> <IMG SRC="106caf6d0.gif" border=0 width="175" height="109" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> THE BROWN COLOR </div> <div> IS USED TO INDICATE A LOWER LAYER</div> <div> ALL THE ATOMS ARE OF ONE TYPE</div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 34 ><NOBR><div> A OVER ALL VIEW OF A 8 ATOM</div> <div> RHOMBOHEDRAL MOLECULAR CRYSTAL</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> A VIEW FROM ABOVE</div> <div> OF THE MOLECULAR CRYSTAL</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 210 ><NOBR><div> <IMG SRC="106bafcd0.gif" border=0 width="175" height="205" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> <tD VALIGN=CENTER><NOBR><div> <IMG SRC="106aafcd0.gif" border=0 width="175" height="205" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 52 ><NOBR><div> A VIEW FROM THE FRONT</div> <div> OF A RHOMBOHEDRAL MOLECULE</div> <div> OF EIGHT EQUAL ATOMS</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="233"><div> A VIEW OF THE SIDE </div> <div> OF A RHOMBOHEDRAL </div> <div> MOLECULAR CRYSTAL</div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=2 HEIGHT= 34 ><NOBR><div> THIS IS A NORMAL CATHODIC DEPOSIT OF SOFT METALS,</div> <div> AND ALSO A PLATING DEPOSIT ON CROMION & PLATINON POINTS</div> </NOBR></tD> </tR> </TABLE></div> <div>     <A HREF="rhombohedral_crystals_m.htm" TITLE="RHOMBOHEDRAL CRYSTALS"><U>BACK TO TOP</U></A></div> <bR> </td> </tr></table></body>