Basalt - Stone Care Guide

Basalt Stone Care Guide

Properties, maintenance, and expert advice for basalt surfaces

Hardness7/10 Mohs
PorosityLow
Acid SensitiveNo - acid resistant
Frost ResistantYes
Slip Risk (wet)Low

About Basalt

Basalt is a dense, dark volcanic rock formed from rapidly cooling lava flows. It is one of the most abundant rocks on Earth's surface and one of the hardest natural stones used in construction. Its fine-grained, uniform texture and deep dark colour - from dark grey to almost black - give it a modern, sophisticated appearance.

With a Mohs hardness of 6-7 and very low porosity, basalt is exceptionally durable and requires minimal maintenance. It is fully acid-resistant and frost-proof, making it ideal for demanding applications both indoors and outdoors. Its natural density means it resists staining far better than most other natural stones.

Basalt is increasingly popular in contemporary architecture for its clean, dark aesthetic. It works particularly well for outdoor paving, facade cladding, and modern kitchen designs. While it rarely needs sealing, a protective impregnator can enhance its longevity in high-traffic commercial settings.

Characteristics

  • Volcanic/igneous rock (fine-grained)
  • Very dense and hard
  • Fully acid-resistant
  • Frost-proof
  • Uniform dark appearance

Common Uses

  • Outdoor paving
  • Modern kitchen countertops
  • Facade cladding
  • Commercial flooring
  • Garden design
  • Pool surrounds

Popular Varieties

  • Basaltina (Italy, blue-grey)
  • Basalt Black (various origins)
  • Olivine Basalt (with green mineral inclusions)
  • Hainan Black (China)

Care Essentials

  • Minimal maintenance required due to natural hardness
  • Can tolerate acidic and alkaline cleaners
  • Sealing optional but recommended for kitchen countertops
  • Use colour intensifier for a deeper, richer appearance
  • Very forgiving stone - hard to damage

Common Problems

  • Algae growth in outdoor shaded areas
  • White haze from cement residue after installation
  • Scratches visible on polished finishes
  • Can appear dull without colour enhancement

Recommended Products for Basalt

Need personalised advice?

Use our Lithofinder to find the right product for your specific basalt problem, or chat with our stone care expert.