Crystals

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General Information

Copper Sulfate

The mineral form of coppersulfate is chalcanthite. White coppersulfate is coppersulfate without water in its crystal structure (the pentahydrate group). This can be used as an indicator for the presence of water. White coppersulfate turns blauw when it gets into contact with water.

Coppersulfate is instabel, because the water from its crystal structure has the tendency to dissolve the coppersulfate around it. This way the coppersulfate crystals will slowly loose their shape and will eventually pulverize.[1]

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Production Methods

Copper sulfate crystals can be made from a solution by evaporating it or from a supersaturated solution by cooling it down gradually. Keep in mind that copper sulfate has a very high solubility, especially at high temperatures.

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Chemical & Physical Information

Trivial nameCopper sulfate
Chemical nameCopper(II) sulfate, pentahydrate
Other namesKoper sulfaat (NL,BE)
Type of chemicalIonic compound (salt)
Chemical formulaCuSO4, 5H2O
CAS number7758-98-7 (anhydrous)
7758-99-8 (pentahydrate)
Crystal systemTriclinic
Bravais latticeTriclinic
Coordination geometryOctahedral
Hardness (Mohs)?
Young's modulus?
ColourBlue
LusterVitreous
StreakWhite (anhydrous), blue (dihydrate)
OpacityTranslucent to transparent
Safety summaryToxic, harmful for the environment
Safety dataMSDS
Production methodSolution vaporization, supersaturated solution cooling.
StorageDry, not in a metal container. Coating for uncovered specimen.
ExtraHygroscopic

For more information, also look at the copper sulfate chemicals and the copper sulfate minerals.

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Photos

Copper Sulfate

(2 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.