Zincolivenite

Zincolivenite is a copper zinc arsenate mineral with formula CuZn(AsO₄)(OH) that is a member of the olivenite group. Its colors range from green to blue, and its name comes from its composition of zinc and olivenite.^[2]

Zincolivenite
Zincolivenite from Agios Konstantinos, Lavrion District Mines, Lavreotiki District, East Attica Prefecture, Greece
General
Category	Arsenate mineral
Formula	CuZn(AsO4)(OH)
IMA symbol	Zoli[1]
Strunz classification	8.BB.30
Dana classification	41.06.06.06
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pnnm
Unit cell	a = 8.5839(15) Å b = 8.5290(13) Å c = 5.9696(9) Å; Z = 4
Identification
Color	Green, greenish blue
Crystal habit	Prismatic crystals, radiating
Cleavage	Perfect on {010}, imperfect on {101}
Fracture	Conchoidal
Tenacity	Brittle
Mohs scale hardness	3.5
Luster	Vitreous
Streak	White
Diaphaneity	Translucent
Specific gravity	4.33
Optical properties	Biaxial (-)
Refractive index	nα = 1.736(2) nβ = 1.784(2) nγ = 1.788(2)
Birefringence	0.052
Pleochroism	Weak X = light bluish green, Y = Z = light blue
2V angle	Measured: 30°
Dispersion	r > v, very strong
Extinction	Parallel extinction
References	[2][3]

It was first described from St Constantine, Lavrion District Mines, Laurium, Attica, Greece. It was approved by the International Mineralogical Association in 2006.^[2]