solid iron inclusion transformed by heating this citrine
citrine
ametrine quartz from Anais in Bolivia
uncut ametrine from Bolivia
citrine crystal from Brazil
fluid inclusions (liquid – gas) in bubbles
solid iron inclusion transformed by heating this citrine
citrine
Detailed sheet
citrine
It is a yellow variety of quartz. Its name comes from the Latin “citrus”, this gem owes its name to its lemon yellow color due to its iron content but the name was male until the seventeenth century (citrine quartz). The natural citrines, of a very pure and bright yellow, are actually quite rare, most of them being amethyst or smoky quartz, heated, but then their color turns more towards the brown-red.
The ametrine is a bicolor variety of quartz , also called bolivianite or trystine for half amethyst and half citrine. Its name reminds the amethyst and citrine.
The Ayoreos Indians living in the El Chaco region, east of Bolivia, about thirty kilometers from Brazil, discovered it entangled in tree roots. They exchanged it for food with the Spanish invaders.
CHEMICAL CHARACTERISTICS
SiO2
silicon dioxide, silica
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
brown, orange, purple
due to iron: from light yellow to golden brown. Ametrine is of two colors: yellow and purple
Color of streak
white
Luster
vitreous
Hardness
7.0 to 0.0
Density
2.63 to 2.65
Cleavage
none
Fracture
conchoidal, splintery
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.543 - 1.554
Double refraction
0.009
weak uniaxial positive
visible double refraction
No
Dispersion
0.013(0.008)
Pleochroism
weak
Number of colors
2
yellow to light yellow. Heated amethysts become yellow and have no pleochroism.
Fluorescence
none
CRYSTALS PROPERTIES
6-sided pseudo-hexagonal prisms ending in 6 sides pyramid
crystals system
trigonal
OTHER INFORMATIONS
Astrological sign
Leo, Pisces, Sagittarius, Scorpio
Month
november
Chinese astrological sign
Rooster
APPROACHING GEMS
Exploited
sites
Deposits of citrine are found in Brazil (Bahia, Minas Gerais), Madagascar, United States, Argentina, Burma, Namibia, Russia, Scotland and Spain.A The ametrine comes mainly from Bolivia where it has to was first exploited in an illegal manner by the army and adventurers who have exhausted the surface layers. It is, since 1990, exploited by a private company, in shafts and tunnels of several tens of meters deep. They are also found in Brazil and Uruguay.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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