Libethenite information

Libethenite
Libethenite
General
Category	Phosphate minerals
Formula; (repeating unit)	Cu2PO4OH
IMA symbol	Lib
Strunz classification	8.BB.30
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) ; H-M symbol: (2/m 2/m 2/m)
Space group	Pnnm
Identification
Color	Light to dark green, blackish green, olive-green
Crystal habit	Globular, druzy, slender prismatic
Cleavage	Indistinct on [100] and [010]
Fracture	Irregular, uneven to conchoidal
Tenacity	Brittle
Mohs scale hardness	4
Luster	Vitreous, greasy
Streak	light green
Specific gravity	3.6 – 4, Average = 3.8
Optical properties	Biaxial (−)
Refractive index	nα = 1.701 – 1.704 nβ = 1.743 – 1.747 nγ = 1.787 – 1.790
References

Libethenite is a rare copper phosphate hydroxide mineral. It forms striking, dark green orthorhombic crystals. It was discovered in 1823 in Ľubietová, Slovakia and is named after the German name of that locality (Libethen).^[2]^[3] Libethenite has also been found in the Miguel Vacas Mine, Conceição, Vila Viçosa, Évora District, Portugal, and in Tier des Carrières, Cahai, Vielsaim, Stavelot Massif, Luxembourg Province, Belgium.^[3]

^ 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 http://webmineral.com/data/Libethenite.shtml Webmineral
^ ^a ^b ^c http://www.mindat.org/min-2394.html Mindat

[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] ttp://webmineral.com/data/Libethenite.shtml Webmineral

[Mindat-3] ttp://www.mindat.org/min-2394.html Mindat

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