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  3. Pseudomalachite

Pseudomalachite mineral - You can buy these samples

Pseudomalachite is not a "bad malachite", but an independent, officially registered IMA (International Mineralogical Association) mineral. If malachite is copper carbonate, then pseudomalachite is copper phosphate.

You can see an elite stone (pseudomalachite) for sale and buy it in the Minerals of Russia online store.   

Physical properties of Pseudomalachite

General
Category Phosphate minerals
Formula
(repeating unit)		 Cu5(PO4)2(OH)4
IMA symbol Pmlc
Strunz classification 8.BD.05
Dana classification 41.04.03.01
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group P21/c
Unit cell a = 4.47 Å, b = 5.75 Å,
c = 17.05 Å; β = 91.06°; Z = 2
Identification
Formula mass 575.7 g/mol
Color Dark emerald green to blackish green
Crystal habit Crystals, which are rare, are prismatic, usually with uneven faces. Pseudomalachite is commonly compact, reniform or botryoidal, or it may be fibrous or in crusts and films.
Twinning On {100}
Cleavage Perfect on {100}, distinct on {010}
Fracture Splintery or conchoidal
Mohs scale hardness 4.5-5
Luster Vitreous
Streak Blue green, paler than the mineral
Diaphaneity Translucent to subtranslucent
Specific gravity (Measured) 4.15 to 4.35
Optical properties Biaxial (-)
Refractive index nα = 1.791 nβ = 1.856 nγ = 1.867
Birefringence δ = 0.076
Pleochroism Weak; X = bluish green to pale green; Y = yellowish green; Z = deep bluish green to blue-green
2V angle 48°
Dispersion Strong rv
Solubility Soluble in acids but without effervescence (in contrast to malachite which effervesces with warm HCl)
Other characteristics Not fluorescent, not radioactive
Pseudomalachite archived
Code: 2579
Pseudomalachite
Mednorudnyanskoye deposit, Nizhny Tagil, Sverdlovsk region, Middle Urals, RF
35*24*19mm

0.00 $ $29.00

Pseudomalachite archived
Code: 2424
Pseudomalachite
Mednorudnyanskoye deposit, Nizhny Tagil, Sverdlovsk region, Middle Urals, RF
29*27*16mm

0.00 $ $29.00

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