Obsidian
黒曜石（オブシディアン）
Obsidian is a natural gemstone with a Mohs hardness of 5–5.5, and its traditional symbolic meaning is “Protection & insight.”
Mohs hardness
5–5.5
Mineral group
Volcanic glass (amorphous)
Color
Black
MEANING
Protection & insight
LORE & HISTORY
A natural glass formed when lava cools rapidly. Its sharp conchoidal fracture made it a tool for blades in the Stone Age.
Meanings and lore reflect widely known traditions and are not claims of effect. Hardness and mineral group are standard mineralogy — About our data