Identification guide · Quartz Family
How to Identify Fire Agate
Fire Agate is usually brown, orange, and red with a waxy luster and is translucent. It has a Mohs hardness of 7. It scratches glass and a steel knife and cannot be scratched by a steel file. Its streak is white. It is most often confused with Agate, Chalcedony, and Dendritic Agate; the tests below separate them.
Fire Agate identification checklist
| Color | Brown, Orange, Red, Gold, Iridescent | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Waxy | Compare a fresh surface with glass and metal; this luster is softer than either. |
| Transparency | Translucent | Hold a thin edge up to a bright light and note whether light passes through. |
| Mohs hardness | 7 | It scratches glass and a steel knife and cannot be scratched by a steel file. |
| Streak | White | Drag a corner across unglazed porcelain (the back of a bathroom tile) and check the powder color. |
| Cleavage | None | |
| Fracture | Conchoidal | Broken surfaces show smooth, curved, shell-like scoops. |
| Specific gravity | 2.6 | Ordinary rock-like heft (specific gravity about 2.6), similar to quartz. |
| Crystal system | Hexagonal |
Fire Agate look-alikes and how to tell them apart
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Fire Agate vs Agate →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Fire Agate vs Chalcedony →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Fire Agate vs Dendritic Agate →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
Is my Fire Agate real?
- Hardness: real Fire Agate sits at Mohs 7. Glass imitations are about 5.5, so genuine Fire Agate scratches glass while a glass fake cannot.
- Bubbles: round gas bubbles under a 10x loupe mean glass or resin, never a natural stone.
- Color: dyed material concentrates color in cracks and pores; look for pigment collecting at the edges of fractures.
- Temperature: natural crystals feel cool and take longer to warm in your hand than plastic or resin.
Field tips
- Look for the distinctive color, pattern, and translucency associated with Fire Agate.
- Photograph a fresh or polished surface in natural light and avoid glare.
- Use hardness, luster, fracture, and locality together; many chalcedony trade varieties overlap visually.
Fire Agate identification FAQ
How can you tell if a rock is Fire Agate?
Check the color (brown, orange, red, and gold), the waxy luster, a Mohs hardness of 7 and a white streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Fire Agate?
Fire Agate has a Mohs hardness of 7. It scratches glass and a steel knife and cannot be scratched by a steel file.
What is the difference between Fire Agate and Agate?
Fire Agate (Mohs 7, waxy luster) and Agate (Mohs 7, waxy luster) look alike, but hardness, streak and heft usually separate them. See the full Fire Agate vs Agate comparison for a side-by-side table.
How do I know if my Fire Agate is real?
Real Fire Agate matches the hardness listed above, shows no round gas bubbles under magnification, and does not concentrate dye in cracks. Glass and resin fakes fail at least one of those checks.
Is Fire Agate worth anything?
Entry-level Fire Agate specimens sell for around $15, typical collector pieces about $90, and premium examples $1000 or more depending on size, quality and locality.
What color is Fire Agate?
Fire Agate is most often brown, orange, red, and gold. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
