Green Obsidian
Volcanic Glass var. Green Obsidian · Decorative Stone / Semi-Precious Gemstone
Crystal System
Amorphous (Non-crystalline)
Mineral Group
Mineraloid
Chemical Formula
SiO2 (Silicon Dioxide) with complex mineral inclusions and trace elements like iron and magnesium
Formation Process
Igneous, formed by the rapid cooling of viscous felsic lava without sufficient time for crystal growth.
About This Crystal
Tumbled, smooth, highly polished pebble showing a vibrant, translucent emerald-green interior with dark areas, exhibiting a glassy luster and subtle internal flow bands.
Physical Characteristics
Rich green body color with dark or black zones, white streak, no cleavage, perfect conchoidal fracture, specific gravity around 2.35-2.60, brittle tenacity, vitreous luster.
Optical Properties
Singly refractive (isotropic), refractive index of approximately 1.48-1.51, transparent to translucent with glassy reflections.
Hardness & Durability
Origin Region
United States (Oregon), Mexico, and regions with recent volcanic activity
Hardness & Durability
Mohs hardness of 5 to 5.5, relatively brittle, vulnerable to scratching by harder minerals like quartz, moderate durability for jewelry if protected.
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid ultrasonic cleaners and harsh chemical solvents, store separately to prevent scratching.
Rarity & Value
Common to moderately rare depending on natural versus manufactured origin, typically affordable as tumbled stones or carvings.
Special Characteristics
Vibrant natural or treated green coloration with vitreous sheen and occasional internal flow lines typical of rapidly cooled volcanic glass.
Lore & History
Associated with the heart chakra, emotional healing, and truth-seeking; traditionally viewed as a protective stone that helps clear emotional blockages.