![emerald cut gaspeite from Australia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/gaspeite-australie-taille-emeraude173-150x150.png)
![crocidolite hawk’s eye](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-faucon-crocidolite-cabochon-bresil80-300x200.png)
compact quartz
![bull’s eye from Brazil cabochon cut](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-fer-cabochon-bresil-300x200.jpg)
bull’s eye from Brazil cabochon cut
![tiger’s eye heart shaped from Brazil](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-tigre-crocidolite-coeur-bresil-300x200.jpg)
tiger’s eye heart shaped from Brazil
![tiger’s eye from Rhodesia](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-tigre-crocidolite-rhodesie-300x200.jpg)
tiger’s eye from Rhodesia
![green aventurine cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/aventurine-cabochon-300x200.jpg)
green aventurine cut in cabochon
![tiger’s eye cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-tigre-cabochon-rond-300x200.jpg)
tiger’s eye cut in cabochon
![bull’s eye cut in cabochon](https://www.patrickvoillot.com/wp-content/uploads/2021/03/oeil-de-boeuf-cabochon-300x200.jpg)
bull’s eye cut in cabochon
![solid like inclusions, green fuchsite and pyrite crystal in aventurine quartz](https://www.patrickvoillot.com/wp-content/uploads/2021/03/inclusions-aventurine-300x200.jpg)
solid like inclusions, green fuchsite and pyrite crystal in aventurine quartz
Detailed sheet
compact quartz
This group includes compact quartz containing inclusions of another mineral which determines the appearance and color.
Tiger’s Eye and Hawk Eye: The name comes from the fact that the polished cabochons show a light stripe evoking the split pupil of a tiger, the second name refers to the bird eye. Tiger’s Eye: yellow gold bronze due to oxidized iron-rich crocidolite
Hawk Eye: blue steel, dark blue to blue-green due to fine inclusions of unoxidized crocidolite. For both, shimmering reflection, rippling with curly look when acicular inclusions are wrinkled, silky texture of fiber breakage.
Cat’s Eye: it is a compact quartz, of light color, containing tremolite fibers arranged in parallel that make that cut en cabochon, it has a luminous line reminiscent of a cat’s eye.
Bull’s eye: alternating red jasper and metal oxides, rare stone.
Aventurine or aventurine quartz, name from the Italian “per avventura” meaning by chance. Known since 1700, green (due to the presence of fuchsite), reddish brown (due to flakes of hematite), golden brown, reddish fluorescent. This gem sparkles, seeming all the more “glittering ” as the lamellar inclusions are numerous and large.
Prase, or prase quartz: green, which gave it its name, due to fibers of actinolite.
Blue quartz: compact variety of quartz with inclusions of needles of blue dumortierite which gives it its color.
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image.png)
CHEMICAL CHARACTERISTICS
SiO2
silicon dioxide
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image2.png)
PHYSICAL CHARACTERISTICS
Main color
brown
Other colors
white, blue, grey, yellow, black, green
Color of streak
white
Luster
dull, greasy, waxy
Hardness
6.5 to 7.0
Density
2.57 to 2.65
Cleavage
none
Fracture
conchoidal
silky sheen on the break (eye of tiger, hawk)
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image3.png)
OPTICAL PROPERTIES
Transparency
opaque, translucent
Refractive index
1.530 - 1.540
Double refraction
0.000
none
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
variable
reddish
Inclusions
asbestos, crocidolite, fuchsite, actinolite, dumortierite
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image4.png)
CRYSTALS PROPERTIES
massive aggregates, fibrous.....
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image5.png)
OTHER INFORMATIONS
Astrological sign
Capricorn, Leo, Libra, Sagittarius, Scorpio, Virgo
![](https://www.patrickvoillot.com/wp-content/uploads/2021/04/zoom-in.png)
![](https://www.patrickvoillot.com/wp-content/themes/astra-child/images/icon-image6.png)
APPROACHING GEMS
Exploited
sites
Tiger’s Eye and Hawk Eye: the major deposits are in South Africa, Western Australia, Burma, the United States (California), India, Namibia. Cat Eye: deposits in Sri Lanka, Brazil and India. Bull’s eye: South Africa. Aventurine: extracted in Austria (Steiermark), Brazil, India, Russia (Urals, Siberia), Tanzania, Madagascar . Prase: deposits in Finland, Germany (Saxony), Austria, Scotland. Blue Quartz: Brazil, Austria, South Africa and USA (Virginia).
use in jewelry
These varieties of quartz are used to make art objects (cups, statuettes …), balls for necklaces, cabochons for jewelry.
Aventurine: it is carved into decorative objects (ashtrays, amulets, statues …), or cut into olives, cabochons and spheres (rings, necklaces, pendants …).
Daily care
and precautions
Overall: acid-sensitive. So do not put in contact with household products and always rinse well after washing with soap and water.
imitations and
treatments
The varieties of tiger eye, falcon eye are often tinted to enhance their color.
Historical
healing properties
Tiger’s Eye and Hawk eye: the message of the tiger’s-eye that casts a bright glow when it is shaken, fascinating by its vivacity, could bring us happiness, warmth of feeling, teach us that this research is only found in ourselves, in helping our introspection, allowing us to discover the limits of the material world. It would remind us that life is a perpetual motion, an ever-changing. Its mirror effect, would reflect the negative energies and have a protective effect. Fragments arranged in the house or above the front door would prevent these negative waves from entering. Warming the body, we would avoid colds if it is placed on the solar plexus chakra. The falcon’s eye has the property to expand our vision, to avoid having only a tunnelled vision. Details that escaped us become visible, our sense of observation would be developed. These two gems are for the Gemini, the Lion, the Virgin.
Aventurine: it would generate generosity, loyalty and would reject all that is vile, turning thoughts into noble actions, idealized. It would calm the anger, strengthening self-control (Throat Chakra), stimulate children’s development.
It is for the sign of Cancer, Taurus and Libra.
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