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Danburite

Danburite

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Danburite Polished Danburite Rough Danburite Jewelry
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Table of Contents
  • General Information
  • Danburite Colors
  • Countries of Origin
  • History
  • Care
  • More About Danburite

Danburite was discovered by American mineralogist Charles Upham Shephard in Danbury, Connecticut for which it is named. It belongs to the silicate group. Crystals are often colorless but can be found in various shades of yellow to brown, and white to pink. Danburite can also display a reddish thermoluminescence.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Danburite
Species
Danburite
Transparency
Transparent - Translucent
Dispersion
Strength: Weak Fire Value: 0.016
Refractive Index
1.630-1.636
Tolerance:(+0.003/-0.003)
Birefringence
0.006
Optic Character
Biaxial
Optic Sign
Positive or Negative
Polariscope Reaction
Doubly Refractive (DR)
Fluorescence
SWUV: inert to weaker, light blue to blue-green
LWUV: inert to strong, light blue to blue-green
Pleochroism
Dichroic, unobservable or weak, varying shades of body color
Hardness
7
Streak
White
Specific Gravity
2.970-3.030 Typical:3.000
Toughness
Good
Inclusions
Danburite might have natural inclusions, fingerprints and parallel growth tubes.
Luster
Vitreous, Greasy
Fracture
Uneven, Subconchoidal
Cleavage
None
Chemical Name
calcium boron silicate
Chemical Formula
CaB2(SiO4)2
Crystal System
Orthorhombic
Chemistry Classification
Silicate

Danburite Colors

  • Blue Danburite
    Blue
  • Colorless Danburite
    Colorless
  • Pink Danburite
    Pink
  • White Danburite
    White
  • Yellow Danburite
    Yellow
  • Yellow Danburite
    Yellow

Countries of Origin

Tanzania, United Republic Of; Myanmar; Afghanistan; Russian Federation; Viet Nam; Czechia; United States of America; Madagascar; United Kingdom of Great Britain and Northern Ireland; Austria; Mozambique; Unknown; China; Brazil; Slovenia; France; Kyrgyzstan; Nepal; Iran (Islamic Republic of); Romania; Sri Lanka; Japan; Switzerland; Bolivia (Plurinational State of); Canada; Norway; Namibia; Italy; Mexico; Australia; Turkmenistan; Germany; Tajikistan

History

Danburite is named for the area in which it was discovered, but we wish it had been named for its beauty.The always gentle, never intense, shades of pink, yellow and brown have a compelling beauty. When well-polished, its surface gleams. Additionally, a CVD coating can be applied to deliver a bright-pink look. This adds another danburite color option! Discovered in 1839 in Danbury, Connecticut, this mineral has a hardness rating of 7 on the Mohs scale. That means it is very wearable and ideal for jewelry. It is often found in crystals of significant size, which is appealing to collectors, jewelry designers and jewelry lovers. Additionally, high-quality danburite is found with excellent clarity and transparency; it seldom needs to be enhanced in any way.

Care

Normal Care unless CVD coated. In treated stones color may be affected by polishing, recutting, ultrasonic cleaners, alcohol, and harsh chemicals.

More About Danburite

Although a relative newcomer on the gemstone scene, Danburite has, nonetheless, its own folkloric appeal. It is said by some to facilitate deep change and the ability to leave the past behind. Some people believe it can promote rest, clear dreams, and stimulate the heart chakra. They believe that it can connect the heart to the mind and the mind to the heart. We have no real scientific evidence that danburite does all these things, but we do know that it is so pretty, it will almost certainly make a person smile.

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