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Chalcanthite

Sulfate mineral

Summary

Sulfate mineral

Field	Value
name	Chalcanthite
category	Sulfate mineral
image	Chalcanthitefrance.jpg
imagesize	260px
formula
IMAsymbol	Cct
strunz	7.CB.20
system	Triclinic
class	Pinacoidal ()
(same H-M symbol)
symmetry	P
unit cell	a = 6.11 Å, b = 10.673 Å,
c = 5.95 Å; α = 97.58°,
β = 107.17°, γ = 77.55°; Z = 2
color	Berlin blue to sky blue, greenish blue
habit	Typically stalactitic, encrusted, reniform or massive. Natural crystals are rare, but are short prismatic or tabular
twinning	Rare as cruciform twins
cleavage	Perfect on {10}; interrupted on {110}
fracture	Conchoidal
mohs	2.5
luster	Vitreous
refractive	nα = 1.514 nβ = 1.537 nγ = 1.543
opticalprop	Biaxial (−)
birefringence	δ = 0.029
2V	Measured: 56°
streak	White
gravity	2.12–2.3
solubility	Soluble in water, turning it blue
diaphaneity	Transparent to translucent
other	[[File:Hazard T.svg	30px]] Poisonous
references

(same H-M symbol) c = 5.95 Å; α = 97.58°, β = 107.17°, γ = 77.55°; Z = 2

Chalcanthite (, ) is a richly colored blue-green water-soluble sulfate mineral . It is commonly found in the late-stage oxidation zones of copper deposits. Due to its ready solubility, chalcanthite is more common in arid regions.

Chalcanthite is a pentahydrate and the most common member of a group of similar hydrated sulfates, the chalcanthite group. These other sulfates are identical in chemical composition to chalcanthite, with the exception of replacement of the copper ion by either manganese as jokokuite, iron as melanterite, or magnesium as pentahydrite.

Other names include blue stone, blue vitriol, and copper vitriol.

Uses of chalcanthite

Chalcanthite on limonite from Washington Camp, Santa Cruz County, Arizona (size: 5.5 x 2.9 x 1.5 cm)

As chalcanthite is a copper mineral, it can be used as an ore of copper. However, its ready solubility in water means that it tends to crystallize, dissolve, and recrystallize as crusts over any mine surface in more humid regions. Therefore, chalcanthite is only found in the most arid regions in sufficiently large quantities for use as an ore.

Secondarily, chalcanthite, due to its rich color and beautiful crystals, is a sought after collector's mineral. However, as with its viability as an ore, the solubility of the mineral causes significant problems. First, the mineral readily absorbs and releases its water content, which, over time, leads to a disintegration of the crystal structure, destroying even the finest specimens. It is critical to store specimens properly to limit exposure to humidity. Second, higher quality crystals can be easily grown synthetically, and, as such, there is a concern that disreputable mineral dealers would present a sample as natural when it is not.

Associated minerals

Given that chalcanthite is found in oxidized copper deposits, it is frequently found in association with other copper minerals. Frequently associated minerals include:

Calcite and its polymorph, aragonite, both
Brochantite,
Chalcopyrite,
Malachite,
Melanterite,

Notes for identification

Chalcanthite's blue color is one of its most notable features, but it is insufficient in identification. Other useful tests include associated minerals, crystal habit, solubility and subsequent coloring of the water blue. Chalcanthite can also dye materials blue when dissolved in water, and has a peculiarly sweet and metallic taste, although consuming it can induce dangerous copper poisoning.

Crystal structure of chalcanthite<br>'''Color code:'''

:Copper, Cu: brown :Sulfur, S: olive :Oxygen, O: red :Cell: cyan ]]

References

Mineral Galleries

References

Warr, L. N.. (2021). "IMA–CNMNC approved mineral symbols".
{{WebMineral. link
{{Mindat
[http://rruff.geo.arizona.edu/doclib/hom/chalcanthite.pdf Handbook of Mineralogy]
[http://www.mindat.org/min-29280.html Mindat Chalcanthite group]

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

pentahydrate-minerals copper(ii)-minerals sulfate-minerals triclinic-minerals chalcanthite-group minerals-in-space-group-2

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