Chemical Formula: NaAIsi3O8CaAI2Si2O8
Class: Feldspar
Hardness: 6-6.5
Coloration: Blue, grey, white, green, sunstone
How to identify it/Unique Characteristics or Properties: It is a calcitic, middle-range member of the plogeoclase feldspar. And if any of that means something to you, congratulations. Basically, this is a minor gemstone that comes in a variety of colors and is best known for it’s amazing shimmer and play of blues and greens.
Where to find it in…
The Northwest: Alaska, Harney County OR.
Other: N.Z., Canada, Finland, Russia, India, Mexico
Past Uses: Jewelry
How it was Made: Formed from thin layers of secondary feldspar that develop through internal chemical separation during cooling of what was originally a single feldspar.
Interesting Facts: Sunstone is a variety of labrodorite (copper inclusions for color in clear labradorite) and is the state gemstone of Oregon.