sedimentary
Calcareous Tufa (or Travertine)
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: Creamy white to light tan, Luster: Dull/Earthy, Structure: Porous and vuggy, Cleavage: None (massive)
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Physical properties
Hardness: 3 (Mohs scale), Color: Creamy white to light tan, Luster: Dull/Earthy, Structure: Porous and vuggy, Cleavage: None (massive)
Formation & geological history
Formed by the precipitation of carbonate minerals from ambient temperature water bodies, often around hot springs or in lake beds. The porous structure is often due to the decay of organic matter trapped during deposition.
Uses & applications
Used in landscaping, as aquarium decor, and sometimes in construction as a lightweight building stone. Scientific use involves paleoenvironmental reconstruction.
Geological facts
The famous Mono Lake in California features massive tufa towers. This specific specimen exhibits a 'cauliflower' or 'popcorn' texture common in evaporative environments.
Field identification & locations
Identify by its lightweight feel compared to limestone, high porosity, and strong reaction (fizzing) when exposed to a weak acid like vinegar. Commonly found in karst landscapes and alkaline lakes.
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