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<p>ions at each of the six vertices. Each octahedron shares three edges with adjoining octahedra, forming an <a href="page.php?w=Orthorhombic_crystal_system">orthorhombic</a> structure.</p>

<p><big> Appearance </big></p>
<p><a href="page.php?w=Image%3ABrookit%2C_Pakistan.jpg">thumb</a>Brookite crystals are typically tabular, elongated and <a href="page.php?w=Striation_%28geology%29">striated</a> parallel to their length. They may also be <a href="page.php?w=Pyramid_%28geometry%29">pyramidal</a>, pseudo-<a href="page.php?w=hexagon">hexagon</a>al or <a href="page.php?w=Prism_%28geometry%29">prismatic</a>.</p><p>
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