This is the density of the actual mineral solid, not the weight of the bulk material powder. This is obvious if this value is being quoted for a mineral but can be confusing if it is for a powder. Thus the density of a powdered mineral is actually referring to the average specific gravity of the tiny particles making up that powder.
A third kind of density is the apparent density of a dried or fired ceramic body (which of course often contains many air pockets). The LDW test has more information on measuring the density of a dry ceramic bar.
The specific gravity of the solid itself (not the powder).
The Physics of Clay Bodies
Learn to test your clay bodies and recording the results in an organized way and understanding the purpose of each test and how to relate its results to changes that need to be made in process and recipe.
ASTM-C20 Density Test
Density information at MineralGalleries
Density of Specific Gravity
Test conducted primarily on materials use to make bodies or glazes.
Tests conducted on bodies made from materials, as opposed to the materials themselves.
|Tests||Bulk Density lbs/cu. ft. (Packed)|
|Materials||Ferro Frit 3134|