Azurite

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Azurite
Azurite from China.jpg
General
CategoryCarbonate meeneral
Formula
(repeatin unit)
Cu3(CO3)2(OH)2
Strunz clessification5.BA.05
Creestal seestemMonoclinic
Creestal clessPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Unit cella = 5.01 Å, b = 5.85 Å
c = 10.35 Å; β = 92.43°; Z = 2
Identification
Formula mass344.67 g/mol
ColourAzure-blue, Berlin blue, verra daurk tae pale blue; pale blue in transmittit licht
Creestal habitMassive, prismatic, stalactitic, tabular
TwinninRare, twin planes Template:Mset, Template:Mset or Template:Mset
CleavagePerfect on Template:Mset, fair on Template:Mset, puir on Template:Mset
FracturConchoidal
Tenacitybrittle
Mohs scale haurdness3.5 tae 4
SkinkleVitreous
StreakLight blue
DiaphaneityTransparent tae translucent
Speceefic gravity3.773 (meisurt), 3.78 (calculatit)
Optical propertiesBiaxial (+)
Refractive indexnα = 1.730 nβ = 1.758 nγ = 1.838
Birefringenceδ = 0.108
PleochroismVeesible shades o blue
2V angleMeasured: 68°, calculated: 64°
Dispersionrelatively waik
References[1][2][3]

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

References[eedit | eedit soorce]