Is baryte radioactive?
Not by formula: baryte, Ba(SO4), holds no uranium, thorium or potassium. The exception is radium in barite scale, up to 400,000 pCi/g per the USGS. Not advice.
Not by its formula. Baryte is Ba(SO4), barium sulphate with no uranium, thorium or potassium, and its Handbook sheet records no radioactivity. The exception is radium: the USGS says barite readily incorporates it and is the main host of radioactive oil-field scale, very small quantities reaching 400,000 pCi/g. This is not safety advice.
In short
- The formula check. The September 2026 IMA-CNMNC Master List gives baryte as Ba(SO4): barium, sulphur and oxygen. A script finds no uranium, thorium or potassium in it, and the Handbook of Mineralogy sheet’s only luminescence line is about light, not radioactivity: may be thermoluminescent, may fluoresce and phosphoresce cream to spectral colors under UV.
- The radium gap. Over the 6,179 rows the parser reads from the IMA list, 319 have uranium in the formula, 35 thorium and 576 potassium. None has radium. No listed species has radium in its formula.
- The exception, from the USGS. USGS Fact Sheet FS-142-99 says barite is known to readily incorporate radium in its structure and that barite is the primary host of oil-field NORM, the radioactive scale that forms in pipes from produced water. The radium is 226Ra and 228Ra, made, the fact sheet says, by decay of uranium and thorium in the rocks of the oil-producing formations.
- The radium ladder, worked. Using the fact sheet’s own definition, 1 picocurie = 2.22 decays per minute, most natural soils and rocks at 0.5 to 5 pCi/g are 0.0185 to 0.185 Bq/g. Uranium ore at 1 wt% uranium is about 3,300 pCi/g of 226Ra, 122 Bq/g. Scale is mostly up to several thousand pCi/g, and very small quantities have reached 400,000, 14,800 Bq/g. These are activities, not doses.
- Documented failure: scale is not a specimen. No source fetched for this page measures radium in crystallised baryte from any Handbook locality, so this page gives no figure for a collector’s piece. The general method is on is my mineral radioactive. IRR17 is enforced by HSE; personal questions go to HSE or a radiation protection adviser. This is not health, safety or legal advice.
| Material | Source | Radium as printed | Bq per gram, worked | Decays per minute per gram | Times the soil upper figure |
|---|---|---|---|---|---|
| Baryte, Ba(SO4) | IMA formula, by script | No radium in the formula | 0 by formula; not a measurement | — | — |
| Most natural soils and rocks | FS-142-99 | About 0.5 to 5 pCi/g total radium | 0.0185 to 0.185 | 1.11 to 11.1 | Up to 1 |
| Uranium ore, 1 weight percent uranium | FS-142-99 | About 3,300 pCi/g of 226Ra | 122 | 7,326 | 660 |
| Most reported US oil-field scale (barite the primary host) | FS-142-99 | Maximum several thousand pCi/g | Not converted (no figure printed) | — | — |
| Very small quantities of scale, highest reported | FS-142-99 | As much as 400,000 pCi/g | 14,800 | 888,000 | 80,000 |
Is barite radioactive? What the formula says
No radioactive element is part of baryte’s formula. The September 2026 IMA list gives baryte as Ba(SO4), status A, 1971 s.p., country unknown. The Handbook of Mineralogy barite sheet writes BaSO4 and uses the US spelling barite. A script that reads the element symbols from the IMA formula finds barium, sulphur and oxygen, and none of uranium, thorium or potassium, Its sulphate relatives celestine, Sr(SO4), and anglesite, Pb(SO4), which the Handbook places in the same barite group, give the same result.
The sheet says nothing about radioactivity. A search for radioact and metamict finds no hit. Its one light-related line is: May be thermoluminescent, may fluoresce and phosphoresce cream to spectral colors under UV. Those are emissions of light, covered on fluorescent minerals explained, not radioactivity. The sheet also says baryte may change color on exposure to light; it gives no cause, and neither does this page.
The analysis did not look for radium. The sheet’s one analysis, from Svárov, Czech Republic, reports SO3, CaO and BaO, total 99.61%. An analysis that does not report an element is not a measurement of zero. The composition itself, 58.84% barium, is worked on the baryte page.
Can baryte contain radium? The USGS answer
Yes, and the USGS says it does so readily. USGS Fact Sheet FS-142-99, Naturally Occurring Radioactive Materials (NORM) in Produced Water and Oil-Field Equipment, says scale in oil-field pipes is typically a mixture of carbonate and sulfate minerals, that one of these is barite, which is known to readily incorporate radium (Ra) in its structure, and that many studies have documented barite as the primary host of oil-field NORM.
Where the radium comes from. The two isotopes are 226Ra, half-life 1,600 years, and 228Ra, 5.8 years, produced by radioactive decay of uranium and thorium in the rocks of the oil-producing formations. How much ends up in the scale depends, the fact sheet says, on the dissolved radium in the water and on how much water moves past the site where barite precipitates. In the fact sheet’s account the radium arrives with the water.
The half-life check. Worked from those two half-lives alone, 30 years after a scale forms 2.8% of its original 228Ra is left and 98.7% of its 226Ra. That agrees with the fact sheet’s statement that most of the radium in older oil-field scale is 226Ra. The radium gap explains the naming: of 6,179 IMA rows parsed, none has radium in its formula, so the list has no species with radium in its formula. Names such as radiobarite have no row on the list (searched by script).
How radioactive can barite scale be? The radium ladder
The fact sheet’s figures, converted. It reports radium in picocuries per gram and defines a picocurie as 2.22 disintegrations per minute, which is 0.0370 becquerels. Most natural soils and rocks contain about 0.5 to 5 pCi/g of total radium, 0.0185 to 0.185 Bq/g. A uranium ore sample with 1 weight percent uranium has about 3,300 pCi/g of 226Ra, 122 Bq/g. The maximum in most reported US oil-field scale is several thousand pCi/g, and very small quantities have been reported with as much as 400,000 pCi/g, 14,800 Bq/g: 80,000 times the soil upper figure and 121 times the 1% uranium ore.
What the ladder is not. These are activity concentrations in pipe scale and soil, read from one US government fact sheet. They are not doses, they are not measurements of mineral specimens, and nothing here converts them into either. For the minerals whose radioactivity is the point, see is torbernite radioactive; for the potassium-40 arithmetic that applies to potassium minerals, see is amazonite radioactive.
Documented failure: the step this page will not take. It would be easy to write that baryte from a uranium district is radioactive. No source fetched for this page measures radium in crystallised baryte from any locality on the Handbook sheet, from Alston Moor and Cumbria to Příbram and the Pöhla mine, so the page names none and claims none. A reading on a particular specimen is a measurement question.
What should I do if my baryte reads above background?
This page gives no handling or storage advice. The general approach for a collection is on is my mineral radioactive and how to store radioactive mineral specimens; neither page is quoted here. The HSE ionising radiation legal base page says the main legal requirements enforced by HSE are the Ionising Radiation Regulations 2017 (IRR17). Questions about a specific specimen, a workplace or a person go to HSE or a radiation protection adviser. This is not health, safety or legal advice.
Baryte’s other question is chemical. Whether barium matters for handling is answered on is baryte toxic, which also explains why witherite is not the same case; hazards in general are on toxic minerals in a collection. Neither is a radioactivity question.
Separating baryte from its look-alikes. The Handbook gives hardness 3 to 3.5 and measured density 4.50; a 20.00 g piece reads 15.56 g in water against 14.96 g for celestine, whose separation from baryte is worked on the celestine page. More guides are in the collecting guides. We hold no catalogue and nothing here is offered for sale; the wanted list is the only commercial route.