results found for: "gemstones"

gemstones

Precious or precious stones , precious or refined [1] are different types of polymers composed of tw...

Amethyst

Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiatio...

Sunstone

Sunstone is a plagioclase feldspar, which when viewed from certain directions exhibit...

Aquamarine Stone

The origin of the word Aquamarine The word Aquamarine is written in Spanish and means "seawate...

Obsidian stone

Obsidian is a naturally occurring volcanic glass formed as an extrusive ign...