Danburite

Danburite is a hard and gem that is durable is great for precious jewellery. The dispersion is relatively strong therefore well cut gems are very attractive and bright. It is not a treasure that is rare in large sizes. Danburite is generally colorless but additionally found in several colors including light pink, champagne and yellowish to brown. 

Danburite is a Ca boracic salt and though it’s a comparatively normally occurring mineral, massive and facetable stone quality material is taken into account particularly rare. Today, danburite is one amongst the lesser-known gemstones and is primarily classified as a collector’s gem. Top grade danburite gemstones occur with glorious transparency and most type with only a few inclusions. Danburite isn’t illustrious to be treated or increased in any means. There are no illustrious synthetics or imitations offered on the market.

Category:	Tectosilicates
Chemical Formula:	CaB2Si2O8
	Calcium Boron Silicate
Molecular Weight:	245.86 gm

Composition:	Calcium	16.30 %	Ca	22.81 %	CaO
	Silicon	22.85 %	Si	48.88 %	SiO2
	Boron	8.79 %	B	28.32 %	B2O3
	Oxygen	52.06 %	O
		100.00 %		100.00 %	= TOTAL OXIDE

 

Crystallography:	Orthorhombic – Dipyramidal
Crystal Habit:	Crystals prismatic, rhomboidal to the square in cross-section, to 50 cm; also as disseminated masses.
Twinning:	None

 

Cleavage:	Indistinct on {001}
Fracture:	Irregular/Uneven to Sub-Conchoidal
Tenacity:	Brittle
Moh’s Hardness:	7.0 – 7.5
Density:	2.93 – 3.02 (g/cm3)
Luminescence:	Fluorescent; violet blue under SW UV, blue to blue-green under LW UV. Thermoluminescent (red)
Radioactivity:	Not Radioactive

 

Color:	Colorless, White, wine-Yellow, Yellowish Brown, Greenish; Colorless in thin section.
Transparency:	Transparent to Translucent
Luster:	Vitreous, Greasy
Refractive Index:	1.627 – 1.639  Biaxial ( +/- )
Birefringence:	0.006
Dispersion:	Relatively Strong;  r < v  (0.017)
Pleochroism:	None