Shattuckite information

Shattuckite
Shattuckite
General
Category	Inosilicate
Formula; (repeating unit)	Cu5(SiO3)4(OH)2
IMA symbol	Sha
Strunz classification	9.DB.40
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) ; H-M symbol: (2/m 2/m 2/m)
Space group	Pcab
Identification
Color	Dark and light blue, turquoise
Crystal habit	Commonly spherulitic aggregates of acicular crystals
Cleavage	perfect along [010] and [100]
Fracture	uneven
Mohs scale hardness	3.5
Luster	Dull to silky
Streak	Blue
Diaphaneity	Translucent to opaque
Specific gravity	4.1 (rather heavy for a non-metallic mineral)
Optical properties	Biaxial (+)
Refractive index	nα = 1.753, nβ = 1.782, nγ = 1.815
Pleochroism	X = very pale blue; Y = pale blue; Z = deep blue
References

Shattuckite is a copper silicate hydroxide mineral with formula Cu₅(SiO₃)₄(OH)₂. It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals. It is closely allied to plancheite in structure and appearance.

Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name). It is a secondary mineral that forms from the alteration of other secondary minerals. At the Shattuck Mine, it forms pseudomorphs after malachite. A pseudomorph is an atom by atom replacement of a crystal structure by another crystal structure, but with little alteration of the outward shape of the original crystal. It is sometimes used as a gemstone.^[5]

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ Shattuckite. Webmineral.com. Retrieved on 2011-10-10.
^ Shattuckite. Mindat.org (2011-09-08). Retrieved on 2011-10-10.
^ Shattuckite. Handbook of Mineralogy. (PDF) . Retrieved on 2011-10-10.
^ "Shattuckite: The blue mineral shattuckite information and pictures".

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[Webmin-2] Shattuckite. Webmineral.com. Retrieved on 2011-10-10.

[Mindat-3] Shattuckite. Mindat.org (2011-09-08). Retrieved on 2011-10-10.

[HBM-4] Shattuckite. Handbook of Mineralogy. (PDF) . Retrieved on 2011-10-10.

[5] "Shattuckite: The blue mineral shattuckite information and pictures".

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