No hammer required, just a simple understanding of mineralogy. If I was looking for diamonds this is the first thing I would try to assess a possible find.
On the scale diamond is 10, florencite is 5-6. Easy, does the crystal scratch my car window or not. It is not rocket science.
http://www.rocksandminerals.com/hardness/mohs.htm
when is a diamond not a diamond, page-5
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