Lava Rock

saf-ahyuh r

Also known as scoria, lava rock is formed from solidified volcanic lava. A defining feature of this rock is cavities caused by trapped gas bubbles. Unlike pumice, however, lava rock does not float on water. The unique look of this highly porous rock, along with its relatively light weight, makes it popular for jewelry and ornamental carvings.

Lava Rock Polished
Lava Rock Classification
Common Name Lava Rock
Species Rock
Lava Rock Optical Properties
Transparency Opaque
Dispersion Strength: None
Optic Character NA
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None
Lava Rock Characteristic Physical Properties
Hardness 5-6
Streak White
Toughness Poor
Inclusions Lava rock or scoria will have rounded or elongated cavities.
Luster Dull, Subvitreous
Stability Good
Fracture Conchoidal
Cleavage Perfect
Lava Rock Chemistry & Crystallography
Crystal System NA
Chemistry Classification Rock

Lava Rock Colors

  • Yellow Lava Rock Yellow
  • Purple Lava Rock Purple
  • Pink Lava Rock Pink
  • Orange Lava Rock Orange
  • Green Lava Rock Green
  • Gray Lava Rock Gray
  • Brown Lava Rock Brown
  • Blue Lava Rock Blue
  • Black Lava Rock Black
  • Red Lava Rock Red
  • White Lava Rock White

Alternate Names


Countries of Origin

Tanzania, United Republic Of; Afghanistan; Iceland; Costa Rica; Greece; China; Russian Federation (the); Chile; Bahamas (the); Ecuador; Argentina; United States of America (the); Hungary; Japan; Kenya; India; New Zealand; Canada; Cuba; Barbados; Turkey; Italy; Mexico; Australia; Jamaica; Peru; Ethiopia; Indonesia


Gentle wear; avoid ultrasonics and high heat.

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.