Properties
Mineral group: Quartz
Chemistry: SiO2
Color: Violet (Amethyst part)/yellow-yellowbrown (citrin part)
Crystal system: Trigonal
Mohs Scale hardness: 7
Refractive index: 1,544-1,553
Birefringence: +0,009
Specific gravity: 2,63-2,65
Information
Can be confused with
Beryl, flourite, spinel, topaz, tourmaline and colored glass. There is also an abundance of synthetic quartz on the gem market, today.
Treatments
Heat treatment
Instruments for identification
Microscope/loupe to observe color changes and inclusions. Generally, synthetic material is mostly free from inclusions and evenly coloured even in it's bi-coloured variety.
Polariscope and conoskope are very useful in identifying all varieties of quartz. With these instruments it's possible to make a diagnostic test of quartz.
Hydrostatic weighing to establish density is an important diagnostic test.
Refrachometer to measure refraction index and birefringence are important tests for all variants of quartz.
Deposits
The most important deposits are found in Bolivia and Brasil.
Miscellaneous
Ametrine is a relatively new and very popular variant of quartz.
Read and learn about Ametrine
Gemstone Guides & Knowledge
Read more about Ametrine on RIDDGEM Blog
Watch movies and Shorts about Ametrine on RIDDGEM YouTube
Ametrine in healing (Source: ChatGPT)
Ametrine is a unique crystal that combines the properties of both amethyst and citrine. Comprised of purple and yellow tones, it brings a harmonious blend of calming, spiritual energy from amethyst and the joyful, energizing effect of citrine.
Read/Learn more about Ametrine – Healing Properties
