Azurite
Appearance
Azurite | |
---|---|
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 mineral produced bi wathering o capper ure deposits.