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Natural Danburite

Danburite is a calcium borosilicate Ca(B2Si2O8) that was first discovered in Danbury, Connecticut. The original deposit is now buried under the city of Danbury.


Find your Danburite

Our Danburite(s) are available in various shapes, sizes and colors. 485 Danburite(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Shape Length (mm) Width (mm)
Category Weight (cts) Price (USD)
Color range
white
yellow-green or green-yellow
yellow
yellowish green
greenish yellow
slightly purplish red

Danburite Profile

Color information: White, yellowish, very light pink, buff colored, very light brown.
Pleochroism: 1.630(+.003,-.003) - 1.636 (+.003, -.003)
Chemical Composition: calcium borosilicate
Hardness: 7
Density: 3.00
Crystal Group: Orthorhombic
Ocurrence: Danbury, Connecticut and Russell, New York, USA; Charcas, San Luis Potosi, Mexico; Kyushu Island, Japan; Mogok, Burma and Uri, Switzerland; Madagascar.
Sign of the Zodiac: N/A
Month of the year: N/A
Danburite Danburite
With a hardness of 7, danburite is quite hard and suitable for any kind of jewelry. Because of itís high refractive index, well cut danburites are remarkably bright and can look something like diamonds. It is normally colorless to very light pink in color but some deposits may produce stones which can be shades of yellow or brown. Danburite handles easily and ordinarily offers no problems for lapidaries. It makes an especially brilliant gem because of its extreme clarity.

The luster is vitreous, and the cleavage is poor in one direction, -basal. The fracture is uneven to conchoidal and the streak is white or colorless. Crystal habits include generally prismatic crystals with a diamond-shaped cross-section. The terminations are steeply slanted producing a wedge like look.

Occurrences:

Primarily in metamorphosed limestones but also in low-temperature hydrothermal veins with sulfides and calcite. Associated Minerals include quartz, feldspars, cassiterite, dolomite, corundum, fluorite, iron sulfides, and calcite.

The bulk of todays danburite production is from the Charcas mineral district in the state of San Luis Potosi in Mexico. The deposit was discovered in 1574 and has been worked ever since for lead, zinc, copper and silver. The metal ore deposits are found in veins along faults in shales, limestones, volcanics, and monzonites. The danburite is a byproduct of the metal ore production. Well shaped and clean crystal terminations over twenty-five carats are rare and most pieces are average around ten carats.

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