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Amethyst Quartz
Amethyst is a variety of quartz that shows a wide variety of purple tonal colorations depending the place were the piece come from, this purple coloration is caused by Iron impurities in a different degrees, so every location give unique characteristics to their specimens, Mexico is the home of the most valuable Amethyst Specimens, coming from the states of Guerrero and Veracruz, in the localities of Amatitlán and Las Vigas respectively.

Physical Characteristics

 

Color: Various shades and gradients of Purple
Luster: Glassy to Vitreous
Transparency: Transparent to translucent
Crystal System: Trigonal
Habits: Very variable, the most common are hexagonal prisms with a six sided pyramid terminations, or druse and massive forms, also present a botryoidal, globular and stalactitic habits
Fracture: Conchoideal
Cleavage: Weak in three directions
Hardness: 7
Specific Gravity: 2.65
Streak: White
Other: Amethys can turn to Citrine if exposed to high temperatures
Occurrence: Mexico (Guerrero, Veracruz), Brasil, Uruguay, Canada, Russia, USA