If the store would empirically create health benefits than it doesn't matter much whether the label of "healing powers" is semantically correct.
The problem is related to the definition of "supernatural" as referring to ontologically basic mental things. "Healing" is a very high level human concept, but involves a variety of different low-level things happening under a variety of circumstances. A stone that does "healing" would be like having a type of acid that only dissolves shirts--it has no way to know whether something is helpful or harmful any more than the acid has a way to know that something is a shirt.
And since it doesn't know that something is helpful or harmful, there will be situations in which it is harmful. It's not going to "empirically create health benefits" all the time--that's impossible. Frankly, any stone that was powerful enough to "heal" is something I wouldn't trust since pretty much any singificant "healing" effect could cause really bad harm under the wrong circumstances.
The problem is related to the definition of "supernatural" as referring to ontologically basic mental things.
Not everyone who believes that a stone is healing power believes that they are ontologically basic.
A stone that does "healing" would be like having a type of acid that only dissolves shirts--it has no way to know whether something is helpful or harmful any more than the acid has a way to know that something is a shirt.
If you have an ill person telling them to get a good nights sleep, helps them heal in a fairly diverse se...
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