Basalt Pebble
Basalt (Igneous Rock) · Mineral Specimen / Decorative Stone
Crystal System
Cryptocrystalline to microcrystalline (various mineral constituents such as plagioclase feldspar and pyroxene)
Mineral Group
Igneous Rock / Silicate group
Chemical Formula
Complex silicate mixture (primarily rich in silica, iron, magnesium, calcium, and aluminum oxides)
Formation Process
Igneous process formed from the rapid cooling of low-viscosity lava rich in magnesium and iron exposed at or very near the surface
About This Crystal
A smooth, water-worn, tumbled dark grey to black pebble with mottled lighter grey or white speckled inclusions and a subdued waxy to matte luster
Physical Characteristics
Dark grey to black body color, white streak, massive or aphanitic habit, no distinct cleavage planes, uneven to sub-conchoidal fracture, specific gravity around 2.8 to 3.0, brittle tenacity
Optical Properties
Opaque, singly or doubly refractive under micro-analysis depending on constituent micro-crystals, non-pleochroic
Hardness & Durability
Origin Region
Found globally in volcanic regions, oceanic crusts, and riverbeds where weathering creates smooth pebbles
Hardness & Durability
Mohs hardness of approximately 5 to 6, moderate to high toughness, good stability against normal environmental factors
Care & Maintenance
Clean with warm soapy water and a soft cloth, store separately to avoid scratching softer materials, highly resistant to ordinary chemicals and sunlight
Rarity & Value
Common, widely available globally, inexpensive ornamental and tumbled stone
Special Characteristics
Often exhibits high thermal capacity, commonly used for hot stone massage therapy due to its ability to retain heat
Lore & History
Historically used in various grounding and balancing practices, thought in modern crystal lore to provide strength, stability, and a deep connection to the Earth's elemental energy