Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Chalcocite
open-in-new
<p>Chalcocite , <a href="/facts/Copper(I)_sulfide/SRvlDxGJ">copper(I) sulfide</a> (Cu2S), is an important <a href="/facts/Copper/I8PEE8oX">copper</a> <a href="/facts/Ore/kgc9DssX">ore</a> <a href="/facts/Mineral/LkUFbNmv">mineral</a>. It is <a href="/facts/Opacity_(optics)/l90q0sAV">opaque</a> and dark gray to black, with a metallic <a href="/facts/Lustre_(mineralogy)/TCobwMGC">luster</a>. It has a hardness of 2.5–3 on the <a href="/facts/Mohs_scale/wXBMcVIm">Mohs scale</a>. It is a <a href="/facts/Sulfide/d8YMjLeu">sulfide</a> with a <a href="/facts/Monoclinic/5PCwXvzX">monoclinic</a> crystal system. </p><p>The term <i>chalcocite</i> from the <a href="/facts/Greek_language/pzDd6eIz">Greek</a> <i>khalkos</i>, meaning "copper". It is also known as redruthite, vitreous copper, or copper-glance. </p>