spinel
red spinel crystal on marble gangue from Mogok In Burma
outstanding pink spinel crystal gem from Kuh-i-Lal in Tajikistan
spinel crystal from Mogok in Burma
oval cut purple spinel from Sri Lanka
red spinel from Tanzania
green spinel from Sri Lanka
emerald cut spinel from Sri Lanka
pink spinel crystal from Tajikistan
solid like inclusion : crystal of a more colored spinel crystal
solid like inclusions : apatite crystal
solid type inclusions with curves : apatite and albite
Detailed sheet
spinel
This is a gem belonging to a group of minerals close to each other and it was many times qualified as liar because it is present in the same deposits of the ruby and sapphire and it has often been confused with these gems.
Some “so-called” rubies are actually spinels, as the Black Prince of the Crown of England or those of the crown of Wittelsbach. It is known since antiquity and origin of its name remains unclear, although it may be an evocation of “small thorns” because of its six-pointed crystals.
The rubicelle focuses on the color orange, yellow or brown.
The broom – spinel is red.
The pleonaste or ceylanite, is of a very dark green and opaque, or even blackish.
The hercynite spinel is a dark green iron spinel of a density of 3.95.
The gahnite or gahno – spinel is red-purple, blue to dark blue, green or black and contains zinc (ZnAl2O4), its density can be up to 4.62.
Picotite is a chromium spinel, it is dark green with a density of 4.2.
The two largest spinels known are at the British Museum, octahedral crystals weighing 520 carats each. Russia has one of 400 carats.
CHEMICAL CHARACTERISTICS
MgAl2O4
aluminum and magnesium oxide
PHYSICAL CHARACTERISTICS
Main color
red
Other colors
blue, colourless, yellow, black, orange, pink, green, purple
all the intensities of colors, from almost colorless to very dark
Color of streak
white
Luster
vitreous
Hardness
8.0 to 0.0
Density
3.54 to 4.62
Cleavage
indistinct
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
transparent
some varieties are translucent and opaques
Refractive index
1.712 - 1.760
Double refraction
0.000
zero isotropic. The refractive index of red spinels is around 1.72
visible double refraction
No
Dispersion
0.020(0.011)
Pleochroism
absent
Number of colors
1
Absorption spectrum
685 - 675 - 665 - 595 - 490
for red spinel (chromium spectrum) 632,480,459 for gahnite. 632,585,555,478,458 for the blue (Iron spectrum )
blue spinel spectrum system
violet spinel spectrum system
blue spinel spectrum system
Fluorescence
variable
strong for the red and pink colors, very low for blue
Inclusions
aligned crystals of dolomite and apatite
CRYSTALS PROPERTIES
octahedra, tetrahedra and even more rarely dodecahedrons, often in twinned crystals and flattened.
crystals system
cubic
OTHER INFORMATIONS
Astrological sign
Aquarius, Aries, Cancer, Capricorn, Gemini, Leo, Sagittarius, Scorpio, Taurus
APPROACHING GEMS
Exploited
sites
They are found where there are rubies and sapphires in the alluvium. In Burma (Mogok region, Namya), Sri Lanka (near Ratnapura), Afghanistan, Tajikistan, Australia, Brazil, United States (New Jersey), Madagascar, Nepal, Nigeria, Tanzania, Thailand.
use in jewelry
In fact it has been widely used in jewelry … but as a ruby, with whom it is very easily confused when it is blood red.
It is therefore quite natural that this gem is increasingly used in jewelry. Spinels are certainly a great opportunity to own a beautiful blood red stone … The “raspberry pink” spinels, recently discovered in Tanzania bring shades of colors in the available palette, rare among the gems. The delicate shades of pink spinels in Tajikistan have no equivalent in the world of jewelry, they go particularly well with the colors of other gems.
Spinel is the stone anniversary of the 22nd year of marriage .
Daily care
and precautions
Solid stone and easy to maintain. Insensitive to household products. It has everything to be used in jewelry, it deserves to be known by its real name! The jeweler must be careful not to heat it too much because it can lose its color intensity.
imitations and
treatments
We know how to synthetize it since 1920.
Historical
healing properties
It would be a very powerful stone, between zircon and garnet, an anchor and realignment stone of the chakras. More powerful than amethyst if it is purple, as much as the schorl if it is black, protecting against negative energies, its properties are similar to those of ruby. The blue spinel would have properties very similar to those of tanzanite.
The powerful red spinels are not recommended for people who are violent, angry and aggressive.
The black spinel is a shield, very powerful, against aggression and negative energies, sending the evil forces, by a mirror effect, back to the darkness from where they originate.
Other
Gems
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