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<p>varieties, a vitreous <a href="page.php?w=Lustre_%28mineralogy%29">luster</a>. Color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities.</p>

<p><big> Crystal habits </big></p>
<p>Calcite has numerous habits, representing combinations of over 1000 <a href="page.php?w=crystallographic_form">crystallographic form</a>s.  Most common are <a href="page.php?w=scalenohedron">scalenohedra</a>, with faces in the hexagonal  directions (morphological unit cell)</p><p>
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