Quartzite
Quartzite is a hard metamorphic rock formed from pure quartz sandstone. It is extremely resistant to weathering and often used in construction. Quartzite can contain visible quartz crystals and displays a glassy appearance when polished, making it both beautiful and durable.
Physical Properties of Quartzite
| Texture | Granular |
| Colors | White, gray, pink, red, yellow |
| Magnetism | Non-magnetic |
| Grain Size | Medium to coarse-grained |
| Hardness | 7 |
| Density | 2.65 – 2.75 g/cm³ |
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Chemical Properties of Quartzite
Main Elements:
Si, O
Chemical Composition:
Primarily SiO₂ (Quartz) - 90% or more
Health Risk of Quartzite
Quartzite dust contains silica and can cause respiratory issues. Wear protective masks when cutting or grinding.
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Market Price:
Polished: $0.50 – $5 per piece
Raw/Tumbled: $1 – $8 per piece
Characteristics of Quartzite
Density:
2.65 – 2.75 g/cm³
Compressive Strength:
100 – 300 MPa
Melting Point:
1713°C (quartz)
Formation:
Forms when sandstone is subjected to intense heat and pressure, causing the quartz grains to recrystallize and fuse together.
Composition:
Composed almost entirely of quartz (SiO₂), making it extremely hard and durable.
Types:
- Pure Quartzite
- Ferruginous Quartzite
- Mica Quartzite
Etymology:
Derived from "quartz" + "-ite", referring to its quartz composition.
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Cultural Significance of Quartzite
Uses:
- Construction
- Decorative stone
- Railway ballast
- Road aggregate
Distribution:
Found in Brazil, India, United States, South Africa, and other regions
Historical Use:
Used by ancient peoples for tools due to its extreme hardness. Harder than steel, making it valuable for cutting tools.
Symbolism:
Represents strength, durability, and resilience
Frequently Asked Questions
How hard is quartzite?
Quartzite has a hardness of 7 on the Mohs scale, making it harder than most rocks and even harder than steel.
What is the difference between quartzite and quartz?
Quartzite is a rock made of quartz crystals that have been fused together, while quartz refers to the mineral itself.
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