Boulders
Boulders are large rocks, typically over 10 inches in diameter, formed through erosion and weathering. They can be any rock type and are often found in riverbeds, mountainsides, and glacial deposits. Boulders provide important clues about geological history and the forces that shaped our landscape.
Physical Properties of Boulders
| Texture | Variable (depends on rock type) |
| Colors | Variable |
| Magnetism | Variable |
| Grain Size | Variable |
| Hardness | Variable |
| Density | Variable |
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Chemical Properties of Boulders
Main Elements:
Variable
Chemical Composition:
Variable, depends on the specific rock type
Health Risk of Boulders
Generally safe, but be careful when moving boulders as they are heavy and can cause injury.
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Market Price:
Polished: N/A (typically not polished)
Raw/Tumbled: $10 – $100+ per piece (depends on size and type)
Characteristics of Boulders
Density:
Variable
Compressive Strength:
Variable
Melting Point:
Variable
Formation:
Formed through erosion and weathering of larger rock formations. Transported by glaciers, rivers, or gravity.
Composition:
Can be composed of any rock type - granite, basalt, sandstone, etc. The composition depends on the source rock.
Types:
- Glacial Boulders
- River Boulders
- Talus Boulders
- Erratic Boulders
Etymology:
Derived from Middle English "bulderston", meaning "large stone" or "rock".
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Cultural Significance of Boulders
Uses:
- Landscaping
- Construction
- Ancient monuments
- Garden features
Distribution:
Found worldwide in riverbeds, mountainsides, and glacial deposits
Historical Use:
Used in ancient monuments and construction. The famous Stonehenge in England uses boulders weighing up to 25 tons, transported over 150 miles.
Symbolism:
Represents stability, permanence, and the power of nature
Frequently Asked Questions
What is the difference between a boulder and a rock?
A boulder is simply a large rock, typically defined as being over 10 inches (25 cm) in diameter. The term refers to size, not rock type.
How are boulders moved?
Boulders are moved by natural forces like glaciers, rivers, gravity, or by humans using heavy machinery for construction purposes.
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