Gemstones, Diamonds, Pearls - Multicolour.com
My Shopping Cart My Account Gem Library
|Welcome to Multicolour.com|Single Stones|Calibrated Stones|Pairs|Mix Lots|Closeouts|Carved Gems|lapidary and gemological tools and supplies|Gem Smart Search|
 Home / Gem Library / Natural Gemstones / Danburite December 05, 2024  


Natural Danburite
E-mail this article to a friend

There are 476 Danburite(s) available at Multicolour.com


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.


Known Facts
Color Key: White, yellowish, very light pink, buff colored, very light brown.
Refractive Index: 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.

With a hardness of 7, danburite is quite hard and suitable for any kind of jewelry. Because of it’s 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.


Illustrations
Danburite Danburite
Check our Top, Largest, Smallest or Latest Danburite's.


Danburite Stats/
Popularity Index: 64517516hits
Total Items: 476items
Total Weight: CTS 4508.72
Cheapest: USD 1.33
Most Expensive: USD 1292.00
Largest: CTS 26.82
Smallest: CTS 0.13
Last Added: 11/29/24 09:14:46

Knowledge Search/
Enter Keywords:
Enter one or more keywords (i.e madagascar sapphires ).

About Gemstones /

Gem Library/
Gems Legend and  Lore Gems Legend and Lore
Some of the latest of ways that gems have been associated with Birthstones and Signs of the Zodiac.
Understanding Gemstones Understanding Gemstones
Learn about Physical and Optical properties, color, clarity and cut of gemstones.
Gems Glossary Gems Glossary
Ever wonder what are "Blemish", "Luster", "Saturation" "Uniformity" or "Mine Run" means?
Reference and  Links Reference and Links
Recommended books and links to Gem, Jewelry&Mineral Magazines, Gem Institutes and Labs.

Book’s Corner/
Buy at Amazon.com Ruby & Sapphire by Richard W. Hughes
Price: USD 98.00
"This book is surely the best study ever done on the exotic subject of rubies and sapphires..."
see more Multicolour.com recommendations

 Top of Page Need help?  

Gemstones for sale: Alexandrite, Garnet, Diamond, Opal, Spinel, Sapphire, Tourmaline, Tanzanite, Tsavorite,
Gemstones by Category: Calibrated, Carving, Closeout, Jewelry, Mixed Lot, Pair, Rough, Single, Best Sellers or Featured Gemstones.
Gemstone education: Colored Gemstones Guide, Gems Library, Gemstone Treatments, Gemstone Glossary, Gems and Astrology,

All Transactions secure by Thawte certificate - click here to validate Ebay Power Seller Gem Certification Various Shipping Options Major Credit Cards Accepted

All trademarks and logos shown herein are the property of their respective owners. © Copyright Multicolour.com, 1998-2011. All rights reserved. Use of this site constitutes acceptance of Multicolour.com Return Policy, Privacy Policy and Trading Guarantee. Published and operated by David Wein Ltd. 32 Hollywood Road, Central, Hong Kong Island Hong Kong. Lost? Check site map or resources page.

Site design and maintenance by NetComposite ®.