Conglomerate rock sample showing texture and color

Conglomerate

Conglomerate is a sedimentary rock composed of rounded pebbles and boulders cemented together. It forms in high-energy environments like rivers and beaches where large particles are deposited. Conglomerate provides clues about ancient landscapes and erosion patterns.

Physical Properties of Conglomerate

TextureClastic (rounded fragments)
ColorsVariable, depends on pebble composition
MagnetismVariable
Grain SizeCoarse-grained (pebbles > 2mm)
HardnessVariable (depends on cement)
Density2.0-2.7 g/cm³
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Chemical Properties of Conglomerate

Main Elements:

Variable

Chemical Composition:

Variable, depends on the composition of pebbles and cementing material

Health Risk of Conglomerate

Generally safe, but be careful of sharp edges when handling broken conglomerate.

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Discover the Value of Conglomerate

Rarity
2.5
Collection Recommendation
3.0
Popularity
3.2
Aesthetic
3.5
Scientific-Cultural Value
4.0

Market Price:

Polished: $0.30-$2 per piece

Raw/Tumbled: $1-$8 per piece

Characteristics of Conglomerate

Density:

2.0-2.7 g/cm³

Compressive Strength:

Variable

Melting Point:

Variable

Formation:

Forms in high-energy environments like rivers, beaches, and alluvial fans where rounded pebbles are deposited and cemented together.

Composition:

Composed of rounded pebbles and boulders (clasts) cemented together by silica, calcite, or iron oxide.

Types:

  • Quartz Conglomerate
  • Polymictic Conglomerate
  • Breccia (angular fragments)

Etymology:

Derived from the Latin word "conglomerare" meaning "to roll together", referring to its composition of rounded fragments.

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Cultural Significance of Conglomerate

Uses:

  • Construction aggregate
  • Decorative stone
  • Garden landscaping

Distribution:

Found worldwide in ancient river deposits and alluvial fans

Historical Use:

Used in construction and as decorative stone. Provides important clues about ancient river systems.

Symbolism:

Represents unity, diversity, and the power of water

Frequently Asked Questions

What is the difference between conglomerate and breccia?

Conglomerate contains rounded pebbles, while breccia contains angular fragments. Both are sedimentary rocks with large particles.

Where is conglomerate found?

Conglomerate is found in ancient river deposits, alluvial fans, and beach environments where large particles were deposited.

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Related Rocks

BrecciaSandstoneGravelPebbles

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