Copper

Info: Copper can be found sometimes in very big dimensions of homogenic material. It can be found in shape of dendrical agregates, wire and other. Cubical or orctaedrical crystals are rare. Native copper is opaque. If broken, it shows a remarcable metal shining in red colour. Common copper is dark or oxydatet.

How to recognize: To recognize copper is not hard. It can be dissolved in hydrogen nitrate, if drop of this dissolved copper is put to a fire on platinium wire, the colour of the flame will turn green. If amoniac is added to this dissolved copper, the liquid will obtain blue colour.

Found: Good copper crystals are found in USA. In Czech Republic copper is found on various locations as Příbramsko, Krušný Hory, Podkrkonoší, Moravika.