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Reference.org
Rutilated quartz
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<p>Rutilated quartz (also known as Venus' Hair Stone) is a variety of <a href="/facts/Quartz/4n86tE2G">quartz</a> which contains <a href="/facts/Acicular_(crystal_habit)/PGMnp4TX">acicular</a> (needle-like) <a href="/facts/Inclusion_(mineral)/LtzBvP3p">inclusions</a> of <a href="/facts/Rutile/qwJH5ElN">rutile</a>. It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black. </p><p>The inclusions may be distributed randomly or in bundles, which sometimes are arranged <a href="/facts/Asterism_(gemology)/cwabWRS6">star-like</a>, and they can be sparse or dense enough to make the quartz body nearly opaque. </p><p>While otherwise inclusions often reduce the value of a crystal, rutilated quartz is valued for the quality of these inclusions. </p>