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Eudialyte / Kakortokite Information

You may have heard or read that Eudialyte is radioactive.

This note is designed to reassure you that the tumble stones of Eudialyte (or the rough/natural pieces of Kakortokite, which contain Eudialyte) that you buy from He Hi She Lo are safe to handle and to outline some basic facts about radioactivity for you.

So let's get on and ask the all important question right up front,

Is Eudialyte radioactive ?

Yes. Eudialyte is described as "mildly radioactive".

Doesn't that mean then that Eudialyte is dangerous to hold - possibly even lethal ?

No.There are varying degrees of radioactivity and the amount of radiation given off by Eudialyte is very small indeed when compared to other normal everyday activities that bring us into contact with other forms of radiation.

It is generally accepted that the annual safe dosage for an adult worker within the nuclear industry (i.e. someone working within a nuclear power station,working on nuclear research at a university, working as a medical doctor with radiotherapy equipment etc) is considered to be 50,000 mrem's per year via the hands and extremities, 15,000 mrem's per year via the eyes and 5,000 mrem's per year if the whole body is exposed. Pregnant mothers should not expose their unborn babies to more than 500 mrem's per year.

You'll see from the chart below that holding one of the 10 gram tumble stones of Eudialyte,continuously, day and night, for a year, means that your radiation dose is still well, well, below these figures.

Type of Radiation for comparison

mrem's per year

Annual safe adult dosage for the hands and extremities


Annual safe adult dosage for the eyes


Annual safe adult dosage if the whole body is exposed


Annual safe dosage for unborn baby


Holding a 10 gram piece of Eudialyte all day and all night for 24 hours = 0.48 mrems. To get a yearly figure multiply this by 365


Dental X-rays (figure is per individual X-Ray i.e. 2 per year = 18.80 mrem)


Chest X-Ray (figure is per individual X-Ray)


10 flights per year as an airline passenger


Watching TV


Smoking cigarettes


Working in a building built predominantly from Granite


Natural background radiation that you absorb if you simply sit in your house or garden and do nothing at all


This information is meant to reassure you, not to put you off - and after all,some people do actually wear Eudialyte jewellery, and Eudialyte has been a popular mineral with collectors for years.