Gemstone profile and identification guide
Lava Stone
Lava stone is a porous volcanic basalt used as an ornamental bead and decorative material.
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Overview
Lava stone is a porous volcanic basalt used as an ornamental bead and decorative material.
Did you know? Many lava-stone beads are intentionally used to absorb aromatic oils.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Lava Stone
Scientific classification: Volcanic Rock (Basaltic Material, Trade Name)
Hardness: 5.5 Mohs
Transparency: opaque
Lustre: dull
Crystal system: Polymineralic aggregate
Primary colour: Black
Secondary colour: Dark Grey
Colour family: Blacks
Porous vesicular texture and basaltic appearance distinguish lava stone from dense black gems.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Values are reported as practical gemological ranges where appropriate.
Physical Properties
Hardness category: medium
Hardness value: 5.5 Mohs
Chemical composition: Fine-grained basaltic silicate rock (composition varies)
Crystal system: Polymineralic aggregate
Common locations: Global volcanic regions; major commercial bead rough commonly from China and Indonesia
Learn more: Gem-A gemstone education resources.
Colour Variations
Porous black to dark grey volcanic rock sold in bead and craft jewelry trade.
Optical effects: Porous Texture
Detailed Gemology
Mineral species: Basaltic volcanic rock aggregate
Mineral group: Volcanic rock trade material
Chemical formula: Fine-grained basaltic silicate rock (composition varies)
Mohs hardness: 5.5
Crystal system: Polymineralic aggregate
Lustre: dull
Transparency: opaque
Streak: Grey
Cleavage: Not applicable in polymineralic rock
Fracture: Irregular
Specific gravity: 2.7-3.0 (variable)
Refractive index: Not typically used as a primary identification metric in this opaque rock material
Optical phenomena: Porous texture
Colour range: Black to dark grey
Common inclusions: Vesicles, microlites, alteration products
Geological environment: Extrusive volcanic basalt flows and scoria environments
Principal mining regions: Global volcanic regions; major commercial bead rough commonly from China and Indonesia
Important commercial sources: Lava stone is a trade term for basaltic volcanic rock rather than a single mineral species
Historical significance: A longstanding ornamental and craft material in many cultures.
Common treatments: Dyeing and surface coatings can occur.
Synthetic or imitation forms: Man-made porous ceramics can imitate lava beads.
Common look-alikes: Black pumice, porous ceramic beads, black glass
Jewellery uses: Used in beads, carvings, and low-cost decorative jewelry.
Care recommendations: Porous texture can absorb oils and chemicals; clean gently and avoid harsh detergents.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Lava Stone.
Formation
Forms from rapid cooling and solidification of basaltic lava at the Earth surface.
Origin
Lava stone is a trade term for basaltic volcanic rock rather than a single mineral species
Uses
Best for: Used in beads, carvings, and low-cost decorative jewelry.
Ideal uses: Beaded jewelry and diffuser-style products where porosity is desired.
Care
Porous texture can absorb oils and chemicals; clean gently and avoid harsh detergents.
Need another candidate? Use advanced gemstone search or return to the identification guide.
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Commonly confused gemstones
Lava Stone FAQ
How can I identify Lava Stone?
Compare hardness (5.5 Mohs), crystal system (Polymineralic aggregate), colour profile, and lustre (dull) with your sample. Then cross-check related gemstones listed above.
What colour range does Lava Stone appear in?
Porous black to dark grey volcanic rock sold in bead and craft jewelry trade.
Where is Lava Stone commonly used?
Beaded jewelry and diffuser-style products where porosity is desired.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 04 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 04 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 04 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 04 factual verification pass.