danburite
danburite crystal from San Luis Potosi in Mexico
danburite from Mexico oval cut
cushion cut danburite from Tanzania
oval cut danburite from Afghanistan
cleavage fault inclusion type filled with iron oxide
negative volume type inclusions
tube – like liquid inclusions
tube – like liquid inclusions
Detailed sheet
danburite
It owes its name to Danbury (Connecticut, United States), where she was discovered in the nineteenth century. In a similar hardness as quartz, it does not exist in brightly colored varieties.
CHEMICAL CHARACTERISTICS
CaB2[SiO4]2
calcium boron - silicate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
brown, yellow, pink
very clear and transparent it presents light colourings yellow or pink
Color of streak
white
Luster
greasy, vitreous
Hardness
7.0 to 7.5
Density
2.96 to 3.04
Cleavage
indistinct
Fracture
uneven
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.625 - 1.639
Double refraction
0.006
very weak, bi-axial +/ -
visible double refraction
No
Dispersion
0.017(0.009)
Pleochroism
weak
Number of colors
2
colorless, yellow
Absorption spectrum
585
Fluorescence
moderate
blue, pink ,brown
Inclusions
glowing, parallel channels
CRYSTALS PROPERTIES
prismatic but seldom of big size
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
They are found in Mexico (known crystals from Charcas, San Luis Potosi), Burma, the United States, Japan, Madagascar, Russia.
use in jewelry
It is easy to faceting because of its poor cleavage and hardness.
This is a gem for collectors which can be used in jewelry when it is colored.
imitations and
treatments
No synthesis to date.
Russian Danburites are irradiated to give them a yellow color.
Historical
healing properties
It would be a stone of spirituality that leads to enlightenment, to our cosmic achievement. Of a purest vibrational potential, more than rock crystal, it has the same clarity but acts very smoothly. It works on all chakras and is particularly suited to qualified individuals, full of tenderness and caring towards others.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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