Amethyst

0

Locality:Amatitlán, Eduardo Neri Municipality, Guerrero, Mexico
(https://www.mindat.org/loc-7318.html)

Formula:SiO2
Colour:Violet - purple
Lustre:Vitreous
Hardness:7
Specific Gravity:2.65 - 2.66
Crystal System:Trigonal

A variety of Quartz

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