- published: 05 Nov 2014
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Cuprite is an oxide mineral composed of copper(I) oxide Cu2O, and is a minor ore of copper.
Its dark crystals with red internal reflections are in the isometric system hexoctahedral class, appearing as cubic, octahedral, or dodecahedral forms, or in combinations. Penetration twins frequently occur. In spite of its nice color it is rarely used for jewelry because of its low Mohs hardness of 3.5 to 4. It has a relatively high specific gravity of 6.1, imperfect cleavage and a brittle to conchoidal fracture. The luster is sub-metallic to brilliant adamantine. The "chalcotrichite" variety typically shows greatly elongated (parallel to [001]) capillary or needle like crystals forms.
It is a secondary mineral which forms in the oxidized zone of copper sulfide deposits. It frequently occurs in association with native copper, azurite, chrysocolla, malachite, tenorite and a variety of iron oxide minerals. It is known as ruby copper due to its distinctive red color.
Cuprite was first described in 1845 and the name derives from the Latin cuprum for its copper content.
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[The Emcee plays a recording on a phonograph.]
[BOY SOPRANO]
The sun on the meadow is summery warm.
The stag in the forest runs free.
But gather together to greet the storm.
Tomorrow belongs to me.
The branch of the linden is leafy and green,
The Rhine gives its gold to the sea.
But somewhere a glory awaits unseen.
Tomorrow belongs to me.
The babe in his cradle is closing his eyes
The blossom embraces the bee.
But soon, says a whisper;
"Arise, arise,
Tomorrow belongs..."
[EMCEE (spoken)]