Emerald quartz is the green variety a new (2016) find from Tanzania, also called Emerald Tanzurine (a trademarked name) and in my world, Hummingbird Quartz. It is an excellent polarity balancer when used in combination with the red variety, Cherry Quartz. For a complete description of its amazing properties, please see the Wisdom Circle blog post entitled "Hummingbird Quartz--Joyful Balance".
Measures 2.15 x 1.73 x 1.24. Weighs 104 grams.