Ametrine
Variety SiO2
Also called Bolivianite
Take care.
- Fades or changes in light: Keep it in the dark, out of sunlight and bright display lights.
- Sensitive to heat: Keep it away from heat and sudden changes of temperature, including hot lights and ultrasonic cleaners.
About it
Quartz with purple amethyst and yellow citrine zones in one crystal, cut to show both colours side by side. Nearly all natural ametrine comes from the Anahí mine in eastern Bolivia.
- Type
- Variety
- Group
- Quartz variety
- Formula
- SiO2
- Hardness (Mohs)
- 7
- Specific gravity
- 2.65–2.66
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- purple and yellow in separate zones
- Transparency
- transparent
- Cleavage and fracture
- none; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.