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The Mineral Conichalcite

Conichalcite is a calcium-copper arsenate hydroxide mineral, which makes oxidized zone deposits of copper ore.  It occurs in bright green color which cannot easily be mistaken for any other mineral.

Chemical Formula  
Cacao (AsO4) (OH)

Derivation of Name  
The conichalcite mineral derives its name from the Greek word “konis”, meaning “powder,” and chalkos, meaning “copper,” referring to copper in its composition and its irregular appearance as a powdery layer.

Occurrence         
Conichalcite has been hesitantly recognized by electron microprobe qualitative analysis (showing the presence of Ca, Cu and as elements) of a variety gathered from Dolyhir Quarry.  X-ray diffraction is needed for totally decisive results since there are several supergene minerals including these elements.

Gemology  
This stone is believed to enhance the imagination and communication of the wearer. A reassuring stone, it helps with emblematic re-birth, assists strengthening of new determination and decisions.

 Source 
Conichalcite occurs prominently in Juab Co., Utah; Bisbee, in Nevada (Lyon and Lincoln  counties,  Arizona (USA); Collahuasi, Durango in Mexico; Tarapaca in Chile; Calstock, Caldbeck Fells and Cornwall Cumbria, England; Andalusia in Spain; and sumeb in  Namibia.

Mineralogy  
It is often caked onto limonitic rocks having a red to yellow color, with the two producing a very vivid specimen. Conichalcite occurs in the regions where copper ore is oxidized. Ground water, rich in oxygen may react with sulfides and/or oxide minerals of copper to create a breathtaking range of striking and multihued minerals in a zone called the oxidation zone. Conichalcite is simply one such mineral. Other oxidation zone minerals are Azurite, Malachite and Linarite etc. With calciovolborthite it forms a solid- solution series, which process takes place when two or more minerals having identical structures can interchange elements within their chemistries without considerably changing the structure of crystals.

Color           
Grass-green to pistachio-green to yellowish green and even emerald-green.

Density                              
4.29 g/cm3

Hardness (Mohs scale)
4.5

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