sedimentary
Travertine (Calcareous Tufa)
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Tan, beige, or white; Luster: Dull to earthy; Crystal structure: Trigonal/Orthorhombic (as microcrystalline calcite or aragonite); Porosity: Highly vesicular and porous feel.
- Hardness
- 3 on Mohs scale
- Color
- Tan, beige, or white
- Luster
- Dull to earthy
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Physical properties
Hardness: 3 on Mohs scale; Color: Tan, beige, or white; Luster: Dull to earthy; Crystal structure: Trigonal/Orthorhombic (as microcrystalline calcite or aragonite); Porosity: Highly vesicular and porous feel.
Formation & geological history
Formed by the precipitation of carbonate minerals from ambient-temperature water bodies, such as springs, lakes, and hot springs. They frequently encrust vegetation, creating a sponge-like texture.
Uses & applications
Used primarily as decorative stone in architecture, flooring, and landscaping. Small specimens are used in educational collections or as terrarium decor.
Geological facts
Tufa can form very quickly in geological terms, sometimes encrusting living moss or twigs which then decay, leaving behind the characteristic holes and pores.
Field identification & locations
Identify by its light weight (due to pores), 'bubbly' or sponge-like appearance, and a strong reaction (fizzing) when exposed to a drop of weak acid such as vinegar.
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