Banded Agate
What is Banded Agate?
Banded Agate is a variety of chalcedony, a cryptocrystalline form of silica. It is characterized by its distinct bands of varying colors and translucency, formed by the deposition of silica in concentric layers within cavities in volcanic rocks. The banding patterns are unique to each stone, creating intricate and visually appealing designs. Banded Agate is prized for its beauty and is often used in jewelry and ornamental objects.
Optical Properties
- Refractive Index
- 1.544 - 1.553
- Birefringence
- 0.004
- Pleochroism
- None
- Optical Character
- Isotropic to weakly anisotropic
- Dispersion
- 0.013
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Banded Agate 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.
Where to Find Banded Agate
RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find banded agate in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find banded agateAlways check the local rules and get the landowner's permission before you collect.
Quick Facts
Physical Properties
- Color
- Wide range of colors including white, gray, brown, red, orange, yellow, green, and blue, often in banded patterns
- Hardness (Mohs)
- 6.5 - 7
- Rock tumbling
- Tumbles well
- Density
- 2.58 - 2.64 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Silicon, oxygen, and trace elements
Also Known As
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Banded Agate FAQs
How do I identify Banded Agate?
Banded Agate can be identified by its hardness of 6.5 - 7 on the Mohs scale, Wide range of colors including white color. Look for these key characteristics when examining specimens.
What color is Banded Agate?
Banded Agate typically appears in Wide range of colors including white, gray, brown, red, orange, yellow, green, and blue, often in banded patterns. Color can vary depending on impurities and formation conditions.
How hard is Banded Agate?
Banded Agate has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.