This article is about the carbonate mineral. For the FDPSO vessel, see Azurite FDPSO. For the green fluorescent protein derivative, see Green fluorescent protein § GFP derivatives. For the mountain, see Azurite Peak.
Azurite
Azurite from New Nevada lode, La Sal, Utah, USA
General
Category
Carbonate mineral
Formula (repeating unit)
Cu3(CO3)2(OH)2
IMA symbol
Azu[1]
Strunz classification
5.BA.05
Crystal system
Monoclinic
Crystal class
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
Color
Azure-blue, dark to pale blue; pale blue in transmitted light
Crystal habit
Massive, prismatic, stalactitic, tabular
Twinning
Rare, twin planes {101}, {102} or {001}
Cleavage
Perfect on {011}, fair on {100}, poor on {110}
Fracture
Conchoidal
Tenacity
brittle
Mohs scale hardness
3.5 to 4
Luster
Vitreous
Streak
Light blue
Diaphaneity
Transparent to translucent
Specific gravity
3.773 (measured), 3.78 (calculated)
Optical properties
Biaxial (+)
Refractive index
nα = 1.730 nβ = 1.758 nγ = 1.838
Birefringence
δ = 0.108
Pleochroism
Visible shades of blue
2V angle
Measured: 68°, calculated: 64°
Dispersion
relatively weak
References
[2][3][4]
Azurite is a soft, deep-blue copper mineral produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite, after the type locality at Chessy-les-Mines near Lyon, France.[3] The mineral, a basic carbonate with the chemical formula Cu3(CO3)2(OH)2, has been known since ancient times, and was mentioned in Pliny the Elder's Natural History under the Greek name kuanos (κυανός: "deep blue," root of English cyan) and the Latin name caeruleum.[5] Copper (Cu2+) gives it its blue color.[6]
^The Ancient Library: Smith, Dictionary of Greek and Roman Antiquities, p.321, right col., under BLUE Archived December 20, 2005, at the Wayback Machine
^"Minerals Colored by Metal Ions". minerals.gps.caltech.edu. Retrieved 2023-03-01.
Azurite is a soft, deep-blue copper mineral produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite...
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problem, and skies and blue robes were often added a secco, because neither azurite blue nor lapis lazuli, the only two blue pigments then available, works...
brown, bone black, charcoal black, lamp black, vermilion, madder lake, azurite, ultramarine, yellow lake and lead-tin-yellow. Synthetic orpiment was shown...
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