زرقون

زرقون
Aegirine, zircon and orthoclase from Mt Malosa, Malawi. Gallery of Mineralogy and Geology of the French National Museum of Natural History in Paris.
General
Category	Nesosilicates
Formula (repeating unit)	zirconium silicate (ZrSiO4)
Strunz classification	9.AD.30
Crystal system	Tetragonal
Crystal class	Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m)
Space group	I41/amd (No. 141)
Unit cell	a = 6.607(1), c = 5.982(1) [Å]; Z = 4
Identification
Color	Reddish brown, yellow, green, blue, gray, colorless; in thin section, colorless to pale brown
Crystal habit	tabular to prismatic crystals, irregular grains, massive
Twinning	On {101}. Crystals shocked by meteorite impact show polysynthetic twins on {112}
Cleavage	{110} and {111}
Fracture	Conchoidal to uneven
Tenacity	Brittle
Mohs scale hardness	7.5
Luster	Vitreous to adamantine; greasy when metamict.
Streak	White
Diaphaneity	Transparent to opaque
Specific gravity	4.6–4.7
Optical properties	Uniaxial (+)
Refractive index	nω = 1.925–1.961 nε = 1.980–2.015, 1.75 when metamict
Birefringence	δ = 0.047–0.055
Pleochroism	Weak
Fusibility	close to 2,550 °C depend on Hf,Th,U,H,etc... concentrations.
Solubility	Insoluble
Other characteristics	فلورسینس and اشعاعی تنزل, May form pleochroic halos, Relief: high
References

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