Chalcophyllite information

Chalcophyllite
Chalcophyllite
	Chalcophyllite from the Ting Tang Mine, Carharrack, Cornwall, England. Photo by Rob Lavinsky
General
Category	Arsenate minerals
Formula; (repeating unit)	Cu; 18Al; 2(AsO; 4); 4(SO; 4); 3(OH); 24·36(H; 2O) or; Cu; 18Al; 2(AsO; 4); 3(SO; 4); 3(OH); 27·33(H; 2O)
IMA symbol	Chp
Strunz classification	8.DF.30
Dana classification	43.5.14.1
Crystal system	Trigonal
Crystal class	Rhomboedral (3) ; H-M symbol: (3)
Space group	R3
Identification
Color	Blue-green to emerald-green
Crystal habit	Crystals platy and six-sided, also as rosettes, drusy, foliated or massive.
Twinning	On {1010} as twin plane.
Cleavage	Perfect on {0001}
Fracture	Irregular
Mohs scale hardness	2
Luster	Vitreous to subadamantine, pearly on {0001}
Streak	Pale green
Diaphaneity	Transparent to translucent
Specific gravity	2.67 to 2.69 or 2.4 to 2.66
Optical properties	Uniaxial (−)
Refractive index	nω = 1.618 to 1.632, nε = 1.552 to 1.575
Pleochroism	O blue-green, E almost colorless
Solubility	Soluble in acids and in ammonia
Other characteristics	Can be partially dehydrated. Alters to chrysocolla. Nonfluorescent, not radioactive
References

Chalcophyllite is a rare secondary copper arsenate mineral occurring in the oxidized zones of some arsenic-bearing copper deposits. It was first described from material collected in Germany. At one time chalcophyllite from Wheal Tamar in Cornwall, England, was called tamarite, but this name is now discredited^[2] (not to be confused with the amphibole mineral taramite, which is quite different). At Wheal Gorland a specimen exhibiting partial replacement of liriconite, Cu
₂Al(AsO
₄)(OH)
₄·(4H
₂O), by chalcophyllite has been found.^[2] The mineral is named from the Greek, chalco "copper" and fyllon, "leaf", in allusion to its composition and platy structure. It is a classic Cornish mineral that can be confused with tabular spangolite.

^ "IMA Mineral List with Database of Mineral Properties".
^ ^a ^b ^c ^d Rocks & Minerals (2009) 84-5: 434 to 440
^ ^a ^b ^c ^d Handbook of Mineralogy
^ ^a ^b ^c ^d Mindat.org
^ ^a ^b ^c Webmineral data
^ ^a ^b ^c ^d Gaines et al (1997) Dana's New Mineralogy, Wiley
^ 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.
^ ^a ^b Mineralienatlas

[RRUFF-1] "IMA Mineral List with Database of Mineral Properties".

[RM-2] Rocks & Minerals (2009) 84-5: 434 to 440

[HOM-3] Handbook of Mineralogy

[Mindat-4] Mindat.org

[Webmin-5] Webmineral data

[Dana-6] Gaines et al (1997) Dana's New Mineralogy, Wiley

[7] 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.

[atlas-8] Mineralienatlas

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