Larimar 6-12mm Graduated Rondelle with Matrix - 15-16 Inch R1261 Prehnite is translucent to transparent

Prehnite is translucent to transparent

and therefore contains unsealed granite

Onyx is a black and white banded Chalcedony

and typically appear in light yellow-green to blue-green to deep moss green

They are all varieties of the mineral corundum

Larimar 6-12mm Graduated Rondelle with Matrix - 15-16 Inch R1261 Prehnite is translucent to transparentLarimar is a translucent blue, turquoise and white stone that can have streaks and patterns of white, as well as red or brown either from oxidation or Hematite inclusions. It is a rare variety of Pectolite, found only in the Dominican Republic. Copper within the Pectolite creates the beautiful blue and turquoise colors in the stone. The blue colors are photosensitive and may fade when exposed to excessive light or heat.