metamorphic
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
Hardness: 6-7 (Mohs scale); Color: Variegated grey, white, and dark tones; Luster: Dull to vitreous; Crystal structure: Non-foliated or weakly foliated with stretched/deformed clasts; Specific Gravity: Approx 2.6-2.7.
- Hardness
- 6-7 (Mohs scale)
- Color
- Variegated grey, white, and dark tones
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Variegated grey, white, and dark tones; Luster: Dull to vitreous; Crystal structure: Non-foliated or weakly foliated with stretched/deformed clasts; Specific Gravity: Approx 2.6-2.7.
Formation & geological history
Formed through the regional or contact metamorphism of conglomerate (a sedimentary rock). Intense heat and pressure cause the original pebbles and cobbles to recrystallize and fuse with the matrix, often stretching them in the process.
Uses & applications
Primarily used as a decorative stone in landscaping, crushed stone for road construction, and as a durable building material in interior architecture.
Geological facts
In a metaconglomerate, the rock will break through the pebbles (clasts) rather than around them, which distinguishes it from its parent sedimentary rock.
Field identification & locations
Identify by looking for 'ghosts' of pebbles that appear stretched or flattened and are fused into the surrounding matrix. Common in mountain belts like the Appalachians or the Alps.
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