Chocolate Selenite 8mm Round - 15-16 Inch hps_06202024 It is an aluminum borosilicate

It is an aluminum borosilicate mixed with iron

a carbonate of chromium and magnesium

more commonly referred to as simply Australian Opal

however it does exhibit a lustrous sheen referred to as “opalescence

Ancient Cellar Black Agate is a natural agate that is dyed and heated to give it the unique color and pattern we call Ancient Cellar

Chocolate Selenite 8mm Round - 15-16 Inch hps_06202024 It is an aluminum borosilicateSelenite is a crystal formed from the mineral gypsum, which comes in many forms and color variations, but has been used historically to describe the transparent variety. Our strands, cut as rounds are somewhat opaque and powerfully radiant fitting since its name originates from the Greek word for "moon," an allusion to the moon like white reflections of the mineral or to the quality of the light transmitted from the stone.