Mineral Group · 16 minerals
Volcanic & Impact Glass
Minerals
16
Hardness
5-7 Mohs
Crystal Systems
Amorphous, Non-crystalline, Trigonal
What Defines the Glass Group
Natural glasses formed by extreme heat events: volcanic eruptions (obsidian), meteorite impacts (tektites, moldavite, Libyan desert glass), and lightning strikes (fulgurite). These lack crystal structure entirely, making them mineraloids rather than true minerals. Their formation stories are among the most dramatic in geology.
Minerals in This Group
Apache Tear
The Grief Stone
Blue Obsidian
The Rarest Volcanic Glass
Bumble Bee Jasper
The Radiant Stone
Fulgurite
Lightning Captured in Glass
Kambaba Jasper
The Crocodile Stone
Lava Rock
The Grounding Stone
Libyan Desert Glass
The Gem of the Sahara
Llanite
Blue-quartz rhyolite, Llano Uplift
Mahogany Obsidian
The Stone of Inner Strength
Moldavite
The Stone from the Stars
Nebula Stone
The Cosmic Pattern
Obsidian
The Volcanic Glass
Rainbow Obsidian
The Stone of Light in Darkness
Rainforest Jasper
The Green Rhyolite
Snowflake Obsidian
The Stone of Balance
Tektite
Meteorite Impact Glass