know oils will stain some of these more delicate stones but which?
are safe and not.
Nearly all quartz based stones are safe to use with oil.
Chrysoprase, a cryptocrystalline quartz, is safe to use with oil.
Dendrites, such as moss agate I would use only water with as
sometimes the dendrites are crystal structures that form in a void,
if this is the case, the crystals will collapse leaving an ugly blob
if you use oil.
Ocean Jasper is also quartz based, it should be fine, the opal would
Turquoise would not be ok unless if was a very good solid material,
some of the cheaper less stable stuff would absorb the oil, the same
applies to chryscolla.
When using oil always wash your stones after cutting. I keep a
bucket of hot soapy water when I cut and as soon as the stone comes
off the blade it goes into the bucket to be cleaned, and I clean my
rough after cutting also. A lot of times I use a water cooled blade
just to cut down on the cleaning after cutting.
Oil will impair the ability of the dopping wax to adhere to your
stone if it is not cleaned well. I have used acetone to remove oil
For the stones you have listed, oil would be ok, but like all
things, keep a notebook of what you work with. A good example is
Amazonite, Colorado material will cut fine with oil and does not soak
into the stone, most of the Canadian amazonite I have worked with is
ok also, the Russian has pieces of mica imbedded into it and only
finishes well if water cut, any exposed mica will absorb the oil and
turn black, if water cut it will keep the shiny appearance and can
look quit attractive when finished.
May not have answered all your concerns, but just cut and keep a
record of the material, and clean after cutting whether water or oil,
water is easier none of the additives I have used have affected my
stones. Some stones will only cut well with oil, water does not cool
well enough to protect the blade.
Hope this helps.