TETRAGONAL 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><A HREF="index.htm" TARGET="_top" TITLE="CHEMISTRY SCHOOL"><U>HOME PAGE - INDEX TO THE LESSONS</U></A>                 TETRAGONAL  SHAPED  •  MOLECULAR CRYSTALS</div> <div> </div> </td> </tr><tr> <td valign="top" width=250 BGCOLOR="#66CCCC" TEXT="#080000"> <div>        THE MOLECULAR CRYSTALS</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="octa_hedral_crystals.htm" TARGET="_top" TITLE="OCTAHEDRAL 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> </td> <td valign="top" height=453 BGCOLOR="#66CCCC" TEXT="#080000"> <div> <I>TETRAGONAL CRYSTALS</I></div> <div> <TABLE BORDER="1" CELLPADDING="4" CELLSPACING="0" WIDTH="493" 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="473"><div> A TETRAGONAL MOLECULAR CRYSTAL</div> </tD> </tR> <tR> <tD VALIGN=CENTER COLSPAN=2 HEIGHT= 102 ><NOBR><div>     1 .HAS A SQUARE TOP & BOTTOM,</div> <div>     2. HAS LONGER SIDES THAN,</div> <div>         EITHER THE TOP OR BOTTOM</div> <div>     3.  HAS 90° PERPENDICULAR ANGLES</div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 15 ><NOBR><div>  OVER ALL VIEW OF THE CRYSTAL</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div>  VIEWS OF THE TOP-BOTTOM & SIDE</div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 173 WIDTH="206"><div> <IMG SRC="ffd86a80.gif" border=0 width="134" height="168" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="ffedba50.gif" border=0 width="219" height="165" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 15 ><NOBR><div> A SIMPLE TETRAGONAL CRYSTAL </div> </NOBR></tD> <tD VALIGN=TOP WIDTH="265"><div>  VIEW OF THE TOP & SIDE</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 219 WIDTH="206"><div> <IMG SRC="fff81c80.gif" border=0 width="129" height="200" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="1000dad60.gif" border=0 width="218" height="214" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 71 ><NOBR><div> A TETRAGONAL </div> <div> EQUI-CENTRIC CRYSTAL</div> <div> HAS 4-8 ATOMS EQUALLY SPACED</div> <div> IN THE CENTER OF THE CRYSTAL </div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> VIEW OF TOP & SIDE OF A </div> <div> TETRAGONAL EQUI-CENTRIC CRYSTAL</div> <div> EQUI-CENTRIC MOLECULAR CRYSTALS</div> <div> ARE USED IN HIGH SPEED CELL PHONES </div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 208 ><NOBR><div> <IMG SRC="101ca0cb0.gif" border=0 width="160" height="203" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> <tD VALIGN=CENTER><NOBR><div> <IMG SRC="101a00a60.gif" border=0 width="256" height="166" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 34 WIDTH="206"><div> A TOP CENTERED </div> <div> TETRAGONAL CRYSTAL</div> </tD> <tD VALIGN=TOP><NOBR><div> VIEW OF THE TOP & SIDE OF TOP CENTERED </div> <div> TETRAGONAL CRYSTAL</div> </NOBR></tD> </tR> <tR> <tD VALIGN=CENTER HEIGHT= 200 ><NOBR><div> <IMG SRC="1053b5950.gif" border=0 width="181" height="149" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> <tD VALIGN=TOP WIDTH="265"><div> <IMG SRC="10548dc30.gif" border=0 width="141" height="195" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 71 ><NOBR><div> A TETRAGONAL </div> <div> EQUI-CENTRIC CRYSTAL</div> <div> HAS 4-8 ATOMS EQUALLY SPACED</div> <div> IN THE CENTER OF THE CRYSTAL</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> VIEW OF TOP & SIDE OF A </div> <div> TETRAGONAL EQUI-CENTRIC CRYSTAL.</div> <div> EQUI-CENTRIC MOLECULAR CRYSTALS</div> <div> ARE USED IN OPTIC HIGH SPEED WIRES </div> </NOBR></tD> </tR> </TABLE></div> <bR> </td> </tr></table></body>