Smoky Citrine double termination point. Rainbows galore with this crystal! Light smoky quality.
Mine opened in October, 2016 in the amethyst fields of Minas Gerais, Brazil. Analysis revealed the unusual color is due to the citrines growth occurring in a layer of earth where gamma radiation is present. This combined with the heat and pressure created the yellow/green coloration. Further intrusion of oxides during the growth cycle produced the phantoms and smoky patterns within the citrine.
(Group shot provided to show how individual citrine colors vary.) Upper row, right