igneous
Basalt Metate
Vesicular Basalt
Hardness: 6 on Mohs scale; Color: Dark gray to brown; Luster: Dull; Texture: Aphanitic, highly vesicular (porous); Specific Gravity: 2.8 - 3.0
- Hardness
- 6 on Mohs scale
- Color
- Dark gray to brown
- Luster
- Dull
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Physical properties
Hardness: 6 on Mohs scale; Color: Dark gray to brown; Luster: Dull; Texture: Aphanitic, highly vesicular (porous); Specific Gravity: 2.8 - 3.0
Formation & geological history
Formed from the rapid cooling of magnesium- and iron-rich lava flows at the Earth's surface. This specific artifact has been manually shaped by human craftsmanship into a traditional grinding stone (metate).
Uses & applications
Traditionally used for grinding grains, seeds, and corn in ancient and indigenous cultures; also utilized as a durable kitchen implement and historical artifact.
Geological facts
Vesicular basalt's natural pits make it exceptionally well-suited for grinding because as the surface wears down, new rough edges are continually exposed. Similar stones have been used for millennia across Mesoamerica and the American Southwest.
Field identification & locations
Identified by its dark volcanic composition, vesicular cavities, and curved carved surface indicating human modification. Commonly found in archaeological contexts or volcanic regions.
