Azurite

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Azurite
Azurite from China.jpg
General
Category Carbonate meeneral
Formula
(repeatin unit)
Cu3(CO3)2(OH)2
Strunz clessification 5.BA.05
Creestal seestem Monoclinic
Creestal cless Prismatic (2/m)
(same H-M symbol)
Space group P21/c
Unit cell a = 5.01 Å, b = 5.85 Å
c = 10.35 Å; β = 92.43°; Z = 2
Identification
Formula mass 344.67 g/mol
Colour Azure-blue, Berlin blue, verra daurk tae pale blue; pale blue in transmittit licht
Creestal habit Massive, prismatic, stalactitic, tabular
Twinnin Rare, twin planes Template:Mset, Template:Mset or Template:Mset
Cleavage Perfect on Template:Mset, fair on Template:Mset, puir on Template:Mset
Fractur Conchoidal
Tenacity brittle
Mohs scale haurdness 3.5 tae 4
Skinkle Vitreous
Streak Light blue
Diaphaneity Transparent tae translucent
Speceefic gravity 3.773 (meisurt), 3.78 (calculatit)
Optical properties Biaxial (+)
Refractive index nα = 1.730 nβ = 1.758 nγ = 1.838
Birefringence δ = 0.108
Pleochroism Veesible shades o blue
2V angle Measured: 68°, calculated: 64°
Dispersion relatively waik
References [1][2][3]

Azurite is a saft, deep blue capper meeneral produced bi wathering o capper ure deposits.

References[eedit | eedit soorce]