Mohs hardness testing kit

A Mohs hardness testing kit, containing ten carefully chosen minerals.


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Mohs hardness testing kit

The Mohs scale is an important scale in gemology and mineralogy - it is a scale of hardness based on the ability of one mineral to scratch another.

The Mohs scale is technically incorrect, as it is quite out of date. Diamond is listed as 10, the hardest substance - we have since discovered some harder materials, but this isn't actually too big a deal unless you're planning to test Diamonds with it! (trust me, you aren't...)

In order of hardest from softest to hardest, we have the following minerals:

  1. Talc
  2. Gypsum
  3. Calcite
  4. Fluorite
  5. Apatite
  6. Feldspar
  7. Quartz
  8. Topaz
  9. Corundum
  10. Diamond - out of stock currently


In this kit, we include:

  1. A piece of rough Talc
  2. A small stick of 'Satin Spar', often sold as Selenite - a form of Gypsum.
  3. A rough piece of Calcite, usually orange, blue, or green.
  4. A Fluorite octahedron.
  5. A small piece of rough Apatite, usually green.
  6. A rough piece of Orthoclase Feldspar.
  7. A Quartz point - usually clear or milky.
  8. A small piece of rough clear Topaz.
  9. A small piece of black Corundum.
  10. A very small (3-3.5MM) Diamond. - out of stock currently

This kit also includes a single streak plate, an unglazed ceramic tile which can be used to help identify certain minerals.


This kit comes with an A4 page of printed instructions.


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