VEVOR KD-B1031 Mode D'emploi page 27

beginning.Starting out, rocks should be avoided if they are highly pitted
throughout the entire body of the rock. Also, you want to be sure you
remove any softer material that's surrounding the harder material. All your
rocks should be of high silica content,which is noted by the conchoidal or
bowl-shaped fracture pattern. This is especially important when looking for
jasper as some jaspers are quartz-based while others are
chalcedony-based. Size doesn't matter when you're obtaining the rocks.
Rocks for intermediate and Advanced Users
Once you've gotten a handle on tumbling beginner stage rocks and think
you're ready to try something harder; you can get some of these more
Intermediate user
Rocks:
Quartz - Easily found, has various color array, can contain ore, usually
doesn't cost much
Quartzy Jasper - easily found, has various color patterns with quartz lines
throughout
Obsidian - varying price range, easy to make smaller as it's like glass, has
multiple colors
Feldspars - has a range of colors, Labradorite and moonstone being most
valued and fun to tumble
Serpentine - green stone that is soft and rounds well with metallic specs in
it,usually inexpensive
Sodalite -blue rock,rounds well quickly
Intermediate user rocks have a consistent hardness but are slightly more
challenging to tumble and get a nice polish afterward. These rocks need to
be separated by type for final polish; otherwise, they will not get a nice
polish.
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