Opinions vary on mixing different types of stones of different hardness in the same barrel. Softer rocks such as the Turritella
Limestone seen above, could never be tumbled with Amethyst, which is harder and would damage the limestone. With such a difference in hardness, it is clear that you should not mix them.
however, such as Snow Stone and Rose Quartz, can be tumbled in the same barrel, I personally however prefer to only tumble one kind of stone in a barrel at any given time. This way - if the results at the end are
not what you expect, you can immediatly discount blame on rock hardness in a mixture and focus your attention on cleaning the barrels and ensuring that larger grits are not present in finer stages.
As you become more
experienced, you can use "Moh's Scale" to determine which specimens can be tumbled together - but for 100% confidence, simply begin by tumbling one kind of rock per barrel per cycle.
The above samples are only a small selection of the many which are available, you may be choosing a set of Semi-Precious gemstones for
tumbling because of your birthdate, or because it is believed to hold a particular healing or other magical property. Whatever your reasons, once you have attained your first batch of rocks, click below to return
to the main page to see how to tumble them correctly for the best results.