Conichalcite information

Conichalcite
Conichalcite
	A thin crust of conichalcite on a rock.
General
Category	Arsenate minerals
Formula; (repeating unit)	CaCu(AsO4)(OH)
IMA symbol	Con
Strunz classification	8.BH.35
Dana classification	41.5.1.2
Crystal system	Orthorhombic
Crystal class	Disphenoidal (222) ; (same H-M symbol)
Space group	P212121
Unit cell	a = 7.39(1) Å, ; b = 9.23(1) Å, ; c = 5.83(1) Å; ; V = 397.66 Å³; Z = 4
Identification
Color	Grass-green to yellowish green, pistachio-green, emerald-green; may be zoned; light green to yellowish green in transmitted light.
Crystal habit	Crusts of acicular to almost fibrous crystals. Also as botryoidal masses and compact crusts.
Twinning	Rare on {001}
Cleavage	Absent
Fracture	Uneven
Tenacity	Brittle
Mohs scale hardness	4.5
Luster	Vitreous, greasy
Streak	Green
Diaphaneity	Translucent
Specific gravity	4.3
Optical properties	Biaxial (+/−)
Refractive index	nα = 1.778 – 1.800 nβ = 1.795 – 1.831 nγ = 1.801 – 1.846
Birefringence	δ = 0.023 – 0.046
Pleochroism	Visible
Dispersion	Strong r < v to r < v moderate
References

Conichalcite, CaCu(AsO₄)(OH), is a relatively common arsenate mineral related to duftite (PbCu(AsO₄)(OH)). It is green, often botryoidal, and occurs in the oxidation zone of some metal deposits. It occurs with limonite, malachite, beudantite, adamite, cuproadamite, olivenite and smithsonite.^[3]^[4]

^ 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.
^ Mineralienatlas
^ ^a ^b Mindat.org
^ ^a ^b Handbook of Mineralogy

[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.

[2] Mineralienatlas

[Mindat-3] Mindat.org

[Handbook-4] Handbook of Mineralogy

Conichalcite information

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