Jasper
What is Jasper?
Jasper is an opaque variety of chalcedony, a microcrystalline form of quartz. It is known for its rich and varied colors, patterns, and inclusions. Jasper is found in a wide range of colors, including red, yellow, brown, green, blue, and purple, often with intricate patterns like banding, spotting, or veining. These patterns are created by the presence of various minerals and impurities within the stone. Jasper is a relatively hard and durable gemstone, making it suitable for various uses, including jewelry, carvings, and ornamental objects. It has been used for thousands of years and is valued for its beauty and purported metaphysical properties.
Optical Properties
- Refractive Index
- 1.54 - 1.55
- Birefringence
- None
- Pleochroism
- Absent
- Optical Character
- Isotropic
- Dispersion
- Low
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Jasper before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Jasper Localities Map
See where Jasper is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Red, yellow, brown, green, blue, purple, and various combinations
- Hardness (Mohs)
- 6.5 - 7
- Density
- 2.58 - 2.91 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, Oxygen, Iron, Aluminum, Calcium, Sodium, Potassium, Magnesium, Titanium
Also Known As
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Jasper FAQs
How do I identify Jasper?
Jasper can be identified by its hardness of 6.5 - 7 on the Mohs scale, Red color. Look for these key characteristics when examining specimens.
What color is Jasper?
Jasper typically appears in Red, yellow, brown, green, blue, purple, and various combinations. Color can vary depending on impurities and formation conditions.
How hard is Jasper?
Jasper has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.