igneous
Tuff with Quartz and Calcite Veining
Lithic Tuff (Silicified)
Hardness (varies): 4-7 on Mohs scale; Color: Pinkish-tan matrix with white/cream veins; Luster: Dull/Earthly matrix with vitreous veins; Structure: Fragmental/Clastic with secondary mineral filling.
- Color
- Pinkish-tan matrix with white/cream veins
- Luster
- Dull/Earthly matrix with vitreous veins
Identified More igneous →
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Physical properties
Hardness (varies): 4-7 on Mohs scale; Color: Pinkish-tan matrix with white/cream veins; Luster: Dull/Earthly matrix with vitreous veins; Structure: Fragmental/Clastic with secondary mineral filling.
Formation & geological history
Formed through the consolidation of volcanic ash and pyroclastic debris, followed by hydrothermal activity that deposited minerals into linear fractures. Common in the Trans-Mexican Volcanic Belt (Eocene to Holocene).
Uses & applications
Primarily used as a construction material (building stone) or 'Cantera' in Mexico; also of interest for geological study and as decorative garden stone.
Geological facts
The location near 19.2°N, 99.5°W (near Toluca/Mexico City) is within a major volcanic province where 'Cantera' or rhyolitic tuff is a signature geological material deeply tied to the region's architecture.
Field identification & locations
Identify by its light weight, porous texture in unweathered parts, and characteristic 'v' or 'u' shaped voids filled with secondary minerals. Found in volcanic outcrops throughout Central Mexico.
