Chalcanthite | Aussie Mineral Hub
World Minerals


Chalcanthite from Local Planet Mine, Arizona USA

Specimen Details

Collection ID #: JG0019

Acquisition Date: 12th October 2013

Although it is only a small specimen, the crystal structure and bright blue colour of this Chalcanthite are fantastic.

Chalcanthite in individual crystals are very rare in natural form, therefore there are a lot of crystals synthetically grown from copper sulphate solutions available on the market. This one, however, is natural. If a Chalcanthite crystal looks too good to be natural, it probably is, as good natural crystals are very hard to come by.

The largest deposit of chalcanthite occurs in Chuquicamata, Chile while many other copper deposits are found in the southwestern parts of the USA.

Caution: Crystal specimens can easily be grown synthetically, and, as such, there is a concern that disreputable mineral dealers could present a specimen to an unknowing person as natural when it’s not. It is recommended that you deal with reputable dealers that you have dealt with in the past when purchasing this mineral

This specimen was purchased from Greg at Blue Gems at the 2013 Central Coast Gem Festival.

Chalcanthite Info

Chemical Formula: CuSO4 · 5H2O

Colour: crystals are a greenish-blue, light to sky blue

Hardness: 2.5

Crystal System: Triclinic

Lustre: Vitreous, silky, dull

Dimensions: 15mm x 20mm x 18mm

Weight: 7g

Locale: Local Planet Mine. Santa Maria Dist – Buckskin Mountains – La Paz County, Arizona, USA.

Chalcanthite Photos

Chalcanthite | Aussie Mineral Hub

Rarity of Mineral


Did you know!?
The specimen should be never touched with the tongue, as Chalcanthite is poisonous. The liquid from Chalcanthite will also stain skin blue for several days.