What it is confused with
Dyed agate in unnatural blues, pinks and purples, and glass. Bright, uniform colors are almost always dyed.
Banded, in almost any color
Agate crystal meaning
Agate is banded chalcedony formed in volcanic cavities, banded, in almost any color, rated 6.5–7 on the Mohs scale. Traditionally, it is associated with steadiness and gradual, unforced progress — attributed, not demonstrated.
- Mohs hardness
- 6.5–7 scratches window glass
- Crystal system
- Trigonal
- Pliny, AD 77
- Book 37.54 as “achates”
- Main sources today
- Brazil also India, Germany
Pliny, Natural History, tr. Bostock and Riley.
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Properties
Composition
Banded chalcedony formed in volcanic cavities
Hardness (Mohs)
6.5–7
Crystal system
Trigonal
Color
Banded, in almost any color
Mined in
Brazil, India, Germany, Mexico, Botswana
Worth knowing
The bands record successive deposits of silica in a gas bubble — each line is a separate episode of mineral-rich water passing through.
History
Named after the Achates river in Sicily, where Theophrastus recorded it around 300 BCE.
Buying
Buying Agate: fakes, value and treatments
What decides the price
Inexpensive overall; fine banding, "fortification" patterns and varieties such as Botswana and crazy lace agate are prized by collectors.
Where it is used
Agate mortars and pestles are used in laboratories because the stone is hard and does not contaminate samples.
A less familiar fact
The German town of Idar-Oberstein has been a center of agate cutting since the fifteenth century.
Practical
Caring for Agate
How to clean it
Warm soapy water. Durable and low-maintenance.
How to tell it is real
Dyed agate in unnatural colors — bright blue, magenta — is everywhere and usually undisclosed. Natural agate colors are earth tones; a neon slice was dyed.
How hard is Agate?
Agate is hard and compact enough that laboratories grind samples in agate mortars. In jewelry it is about as low-maintenance as stones get.
Agate, at 6.5–7, is harder than 19 of the other 42 stones here and softer than 15, with 8 level with it.
Primary source
What Pliny the Elder wrote about Agate
“Achates was a stone formerly in high esteem, but now held in none. It was first found in Sicily, near a river of that name; but has since been discovered in numerous other localities.”
Pliny the Elder, The Natural History, translated by John Bostock and H. T. Riley (London: H. G. Bohn, 1855–57), book 37, chapter 54 — read the original text.
Agate is named after the river Achates in Sicily, as both Pliny and the Greek writer Theophrastus record. Who Pliny was and why we quote him →
Traditional associations
Agate is traditionally associated with steadiness and gradual, unforced progress. Chakra in crystal practice: Varies by variety. Element: Earth.
Questions about Agate
What is Agate made of?
Banded chalcedony formed in volcanic cavities, crystallizing in the trigonal system.
Which month is Agate the birthstone for?
Only as an alternative stone, for May.
Where does Agate come from?
Brazil, India, Germany, Mexico, Botswana.
Can Agate be worn every day?
Yes, and it is easy to live with: at 6.5–7 on the Mohs scale, it is tough and needs nothing more than soapy water.
Sources
Statements of fact on this page were checked against these sources in October 2026. How we choose and check sources: editorial policy.
Cite this page
AstroHot. “Agate Crystal Meaning: Properties, Hardness and Origins.” Accessed October 28, 2026. https://astrohot.com/crystals/gemstones/agate/
For Wikipedia
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