Fire Agate
A variety of Chalcedony
What is Fire Agate?
Fire Agate is a rare, semi-precious stone that gets its beautiful colors and fire-like appearance from hematite particles within the rock. When the light enters it, this unusual gem produces iridescent colors that change as the light source is moved. Fire Agate is known as a birthstone of the Zodiac sign of Aries.
Optical Properties
- Refractive Index
- 1.530-1.543
- Birefringence
- 0.003-0.009
- Pleochroism
- None
- Optical Character
- Biaxial positive
- Dispersion
- 0.013
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fire 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 Fire Agate
Fire Agate is a variety of Chalcedony. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find chalcedony in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find chalcedonyAlways check the local rules and get the landowner's permission before you collect.
Health & Safety Information
- ⚠️Fire Agate in powdered form can be toxic due to its Crystalline Silica content.
- ⚠️Quartz, silica, crystalline silica and flint are non-toxic materials, but very fine dust containing quartz, known as respirable crystalline silicon (RCS), can cause serious and fatal lung disease. Lapidaries should exercise caution when cutting silica.
- ⚠️Fire Agate is typically non-toxic unless it's in powder form. Long-term exposure to finely ground powder may lead to silicosis. Therefore, when cutting or polishing fire Agate, be sure to wear a dust mask to avoid inhaling its dust.
Quick Facts
Physical Properties
- Color
- Orange, yellow, brown, red, yellow, blue, iridescent
- Hardness (Mohs)
- 6.5 - 7
- Rock tumbling
- Tumbles well
- Density
- 2.59 - 2.67 g/cm³
- Streak
- White
- Luster
- Waxy, Vitreous
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- SiO2
- Elements
- Si, O
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Fire Agate FAQs
How do I identify Fire Agate?
Fire Agate can be identified by its hardness of 6.5 - 7 on the Mohs scale, Orange color, Waxy, Vitreous luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Fire Agate?
Fire Agate typically appears in Orange, yellow, brown, red, yellow, blue, iridescent. Color can vary depending on impurities and formation conditions.
How hard is Fire Agate?
Fire Agate has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.