QUARTZ, variety Amethyst
SiO₂
Santa Margarita mine, Amatitlan, Guerrero, Mexico

As the tapering amethyst crystals from this deposit grow they change color. Within the crystals of this beautiful cluster can be seen the darker colored phantom shapes of earlier stages of growth.

Size: 24 cm tall

Acquired: 1991 purchase, Chromy Fund.

Disposition: On display in the Systematic Mineralogy exhibit.

Catalog Number: 37290