Obsidian

About

Obsidian is a natural volcanic glass formed when molten lava cools so rapidly that it does not have time to crystallise. Its smooth, glassy texture and deep black colour make it a distinctive and attractive material. Variants like snowflake obsidian, which contains white inclusions, and rainbow obsidian, with its iridescent sheen, add to its appeal. Obsidian has been used for thousands of years in tools, weapons, and jewellery due to its sharp edges and appearance.

Birthstones & Anniversaries

Obsidian is not a traditional birthstone but is associated with the zodiac sign Scorpio, symbolising protection, grounding, and transformation.

Crystal Healing Energy

Black obsidian is all about protection and grounding, making it a go-to for anyone wanting to feel anchored and safe. Connected to the root chakra, it’s like your energetic shield against negativity, helping you stay grounded and centred. With black obsidian, you’re not only protected but also gaining clarity—it’s fantastic for cutting cords, cutting through illusions and uncovering hidden truths, so you can dive into some serious self-reflection and growth.

Facts

Volcanic glass: Obsidian forms from rapidly cooled lava, resulting in a natural glass without a crystal structure.

Sharp edges: Obsidian can be fractured to create extremely sharp edges, which is why it was used for blades and tools by ancient civilisations.

Ancient uses: Obsidian has been used for arrowheads, knives, and mirrors since prehistoric times, with a history of use in civilisations like the Aztecs and Mayans.

Found near volcanoes: Major deposits of obsidian are found near volcanic regions, such as Mexico, the United States, and Italy.

Science

Mineral: Volcanic glass (not a true mineral)
Crystal System: Amorphous
Chemistry: SiO₂ (with impurities)
Colour: Typically black, but also brown and multicoloured
Refractive Index: 1.45 to 1.55
Birefringence: None
Specific Gravity: 2.3 to 2.6
Mohs Hardness: 5 to 5.5

Treatments

Obsidian is typically untreated, as its natural glassy appearance is highly valued.

Synthetics

There are no widely produced synthetic versions of obsidian.

Imitations

Coloured glass can be used to imitate obsidian, especially black glass. However, glass imitations lack the volcanic origin and the distinctive natural qualities of real obsidian and variation in types.

similar materials

Jet: Often mistaken for obsidian due to its black colour, but jet is a fossilised wood with a lower hardness and lighter feel.
Onyx: A black variety of chalcedony that may resemble obsidian but has a crystalline structure and is typically banded.
Tourmaline: Black tourmaline may be confused with obsidian due to similar colouring, but it has a much higher hardness and a crystal structure.