sedimentary
Travertine / Tufa
Calcium Carbonate (CaCO3)
Mohs hardness of 3; tan, cream, and beige coloration; dull to earthy or faintly vitreous luster; porous, cellular, and layered structure; specific gravity around 2.7.
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Physical properties
Mohs hardness of 3; tan, cream, and beige coloration; dull to earthy or faintly vitreous luster; porous, cellular, and layered structure; specific gravity around 2.7.
Formation & geological history
Formed by the rapid precipitation of calcium carbonate from mineral springs, hot springs, or limestone caves, often incorporating plant matter leaving hollow voids.
Uses & applications
Widely used as an architectural building stone, floor tile, decorative garden rock, and aquarium stone.
Geological facts
Travertine was used extensively by the Ancient Romans to build the Colosseum and St. Peter's Basilica.
Field identification & locations
Identified by its porous, vuggy texture, tan/buff color, soft surface (scratched by steel), and strong effervescence in dilute acid. Commonly found near geothermal springs and karst landscapes.
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