Granite contains radioactive materials.
Is decomposed granite radioactive.
Granite is the most abundant type of natural stone in the world.
Prowling the hills with a geiger counter an amateur prospector is apt to be elated when he gets a high count form a body of granite or decomposed granite.
Further weathering produces rock that easily crumbles into mixtures of gravel sized particles sand and silt sized particles with some clay eventually the gravel may break down to produce a mixture of silica sand silt particles and clay.
However it is undeniable that granite does contain radioactive materials some more so than others do.
When granite erodes and endures weathering over time it easily starts flaking and crumbling away from its parent source.
Decomposed granite is the completely natural derivative of granite.
It isn t a surprise that granite emits radiation.
It forms as a result of magma cooling over millions of years under intense pressure and heat.
The radioactivity of granite as a matter of fact has led to much confusion on the part of week end prospectors.
Decomposed granite is rock of granitic origin that has weathered to the point that it readily fractures into smaller pieces of weak rock.
The amount of radiation emitted from granite can vary depending on the natural uranium and or thorium concentration.
These trace concentrations may vary from stone to stone or even within a single slab of granite.
So do other items in our households.