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Rock Identification
(imgs.xkcd.com)
'Is it worth anything?' 'I dunno, is the answer to that question worth another $5?'
Better method:
"Look at this cool agate I found!"
Where "agate" is substituted for any obviously incorrect identification.
Here in Kentucky, it's likely either agate or coal. There isn't much else.
this is why kentuckees have such great teeth, lots of coalgate
: Makes angry eye contact and points to door:
You have some ancient opal but very few people find it
This approach does save $5.
I usually go with meteoric iron, that's specific enough that they want to take a closer look