Mineral Class: Quartz
Crystal System: Amorphous
Hardness: 5.5 - 6.5
Luster: Subvitreous to Waxy
Diaphaneity: Opaque
Colors: Various Shades of Green, Yellow
Birthstone: October 
Symbolizes: Nature
Source: Australia, Brazil, Canada, Iceland, Madagascar, Mexico, Peru, Tanzania

This stone is a variety of opal that appears in a beautiful range of green shades, as well as occasionally yellow. Green Opal is often referred to as Pistachio Opal because it is most commonly seen in a pistachio green color. Its Greek name ‘Opallios’ means ‘to see a change of color’ as opal comes in a wide array of colors and gives off amazing rainbow sheen. Opal is the birthstone for the month of October and green opal is a treasured color of opal. Green is a color that represents many important things such as nature, tranquility, and good luck.