GEMSTONE ENCYCLOPEDIA
Obsidian
Natural volcanic glass that forms when lava cools rapidly, often polished to a dark reflective finish.
ColourBlack and other dark colours
Mohs hardness5–5.5
Mineral familyVolcanic glass
BirthstoneNot listed
What is Obsidian?
Natural volcanic glass that forms when lava cools rapidly, often polished to a dark reflective finish.
Colour and appearance
Black and other dark colours
Traditional meaning and symbolism
Historically used in tools and ornamentation
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Traditional meanings are cultural associations, not proven medical benefits.