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Laguna Agate
Laguna Agate is silicate (chalcedony), SiO2 (cryptocrystalline). In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs scarlet red and pink. Tight, razor-sharp fortification banding in saturated reds and pinks, often with dramatic parallax shadow effects when the polished face is rocked under light.
The geology.
Laguna Agate carries the formula SiO2 (cryptocrystalline). It belongs to the trigonal (cryptocrystalline) system. The trade files it under silicate (chalcedony).
It sits at 6.5 to 7 on the Mohs scale. The surface reads waxy to vitreous on polish. Light behaviour is translucent. Specific gravity runs 2.58 to 2.64. The streak is white. It breaks with conchoidal fracture.
Tight, razor-sharp fortification banding in saturated reds and pinks, often with dramatic parallax shadow effects when the polished face is rocked under light.
Common cuts are nodules, polished face cuts, cabochons or display halves.
The origins.
Ojo Laguna area, Chihuahua, Mexico; nodules weather out of Tertiary volcanic ash beds.
On value, the database notes: mid to high; sharp red parallax-banded nodules command strong collector prices.
Traditional associations.
In energy work traditions, associated with steady grounding and patient, layer-by-layer personal growth.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Tight, razor-sharp fortification banding in saturated reds and pinks, often with dramatic parallax shadow effects when the polished face is rocked under light.
Dyed look-alike slabs from Brazil are common; genuine Laguna color is layered, varied, and never uniformly neon.
| Looks like | How to tell them apart |
|---|---|
| Botswana agate | Botswana banding runs gray-pink and softer; Laguna bands are tighter and hit vivid scarlet and lavender |
| Dyed Brazilian agate slice | Dye gives one uniform neon tint; Laguna shows many natural hues changing band to band |
| Condor agate | Condor bands are broader and more varied in width; Laguna banding is famously fine and even |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for laguna agate.
| Test | What you should see |
|---|---|
| Scratch check | Scratches glass (Mohs 6.5 to 7) |
| Under a loupe | Band lines stay crisp under a loupe, no dye pooling in fractures |
| By eye | Nodule exterior shows rough volcanic rind |
If these checks leave you unsure, that is what appraisers are for. Do not file, heat or soak a piece to find out.
Care & handling.
At 6.5 to 7 on the Mohs scale it handles careful wear but scratches against quartz and dust. Store it separately and take rings off before rough work.
It breaks with conchoidal fracture, which is worth knowing before you set it or drop it.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is SiO2 (cryptocrystalline). Crystal system: Trigonal (cryptocrystalline). Specific gravity: 2.58 to 2.64. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Ojo Laguna area, Chihuahua, Mexico; nodules weather out of Tertiary volcanic ash beds.
What it gets confused with
Botswana agate: Botswana banding runs gray-pink and softer; Laguna bands are tighter and hit vivid scarlet and lavender. Dyed Brazilian agate slice: Dye gives one uniform neon tint; Laguna shows many natural hues changing band to band. Condor agate: Condor bands are broader and more varied in width; Laguna banding is famously fine and even.
What it is worth
Mid to high; sharp red parallax-banded nodules command strong collector prices.
Where buyers get caught
Dyed look-alike slabs from Brazil are common; genuine Laguna color is layered, varied, and never uniformly neon.
One more thing
Laguna is widely called the finest banded agate on Earth, top nodules are graded and sold individually like gemstones rather than by the pound.
An education-first guide.
There is nothing to buy on this page. Laguna Agate is not part of our catalogue, and the guide is here anyway because somebody searching the name deserves a straight answer.
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