EQUI-CENTRIC ORTHO-RHOMBIC

<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>                <B>  </B> • EQUI-CENTRIC  •  ORTHO-RHOMBIC CRYSTALS  </div> <bR> <div> </div> </td> </tr><tr> <td valign="top" width=254 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>EQUI-CENTRIC ORTHO-RHOMBIC</I></div> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="1" CELLPADDING="5" CELLSPACING="0" WIDTH="480" BORDERCOLORLIGHT="#993380" BORDERCOLORDARK="#993380" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" BGCOLOR=#FFFFFF > <tR> <tD VALIGN=CENTER COLSPAN=2 HEIGHT= 15 ><NOBR><div> EQUI-CENTRIC ORTHO-RHOMBIC MOLECULAR CRYSTALS</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER COLSPAN=2 HEIGHT= 136 ><NOBR><div> 1. HAVE SIX  RECTANGULAR SIDES</div> <div> 2. AN EVEN NUMBER OF ATOMS OR</div> <div>     MOLECULAR GROUPS ON EACH SIDE</div> <div> 3. NO ATOMS OR MOLECULAR GROUPS</div> <div>     AT THE EXACT CENTER OF THE FORM</div> <div> 4. ALL 90° PERPENDICULAR ANGLES</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 15 ><NOBR><div>  OVER ALL VIEW OF THE CRYSTAL</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div>  VIEWS OF THE TOP-BOTTOM & SIDES</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 257 ><NOBR><div> <IMG SRC="1014badb0.gif" border=0 width="186" height="219" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="1012cdfc0.gif" border=0 width="205" height="252" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 34 ><NOBR><div> A 2-4-6 EQUI-CENTRIC</div> <div> ORTHO-RHOMBIC CRYSTAL </div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div>  VIEWS OF THE TOP & SIDES</div> <div> OF THE 2-4-6 EQUI-CENTRIC CRYSTAL</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER COLSPAN=2 HEIGHT= 223 ><NOBR><div> THE EQUI-CENTRIC ORTHORHOMBIC CRYSTAL</div> <div> HAS EIGHT ATOMS OR REPETITIVE MOLECULAR UNITS</div> <div> EQUALLY SPACED AS IN A CUBE, AROUND THE CENTER.</div> <div> IT DOES NOT HAVE AN ATOM IN THE CENTER OF THE CRYSTAL</div> <div> WHEN VIEWED FROM THE TOP, BOTTOM OR ANY SIDE</div> <div> THIS TYPE OF CRYSTAL IS NORMALLY MADE OF AN EVEN NUMBER</div> <div> OF SMALLER CUBIC OR TETRAGONAL MOLECULAR CRYSTALS</div> <div> MANY ANODIC CRYSTALS ARE MADE IN THIS WAY,</div> <div> THEY CAN BE BROKEN INTO THEIR SUBCOMPONENT </div> <div> ATOMIC ELEMENTS WITH SONAR OR MICROWAVE RADIATION,</div> <div> MORE EASILY THAN OTHER TYPES OF MOLECULAR CRYSTALS</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER COLSPAN=2 HEIGHT= 43 ><NOBR><div> THE RED<FONT SIZE="1" COLOR="#FF0000" FACE="Arial" > •</FONT> DOT IN THE CENTER OF THE 3 TOP & SIDES VIEWS </div> <div> INDICATES THE OPEN SPACE IN THE EXACT CENTER OF THE CRYSTAL</div> </NOBR></tD> </tR> </TABLE></div> <bR> <bR> </td> </tr></table></body>