BEAUTIFUL PIECE OF AMETHYST QUARTZ CRYSTAL FROM LA UNION, MURCIA. CRYSTAL OF A BEAUTIFUL COLOR TYPICAL OF AMETHYST. THIS PIECE HAS IN SPECIAL A TONE STRONGER THAN NORMAL. LARGE CRYSTAL ON THE MATRIX.
Quartz is the most common mineral, the most abundant that can be found on earth.
It is composed of silicon and oxygen with SiO₂ formula.
According to the Nickel-Strunz classification, quartz belongs to the class of oxides, while in the Dana classification, it is considered a tectosilicate.
There are multiple varieties of quartz , colors and types.
