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 Amateur Geologist, Inc :: Education :: Rock & Mineral Collections :: Scale of Hardness with Diamond

Scale of Hardness with Diamond
Scale of Hardness with Diamond 
MINERALS IN THE SCALE OF HARDNESS
The determination of the hardness of a mineral can be an important step toward its identification. Hardness is the resistance which he smooth surface of a mineral offers to being scratched. A diamond is the hardest of all substances and can only be scratched by another diamond.

Over a century ago, Friedrich Mohs by experimentation made up a scale of hardness which is referred to as Moh's scale. It does not imply an exact hardness, but is set up so that any mineral can scratch all those beneath it in the scale, or can be scratched by those above it in the scale.

Since diamond is the hardest it is given the number 10; talc is the softest so it is given number 1. Quartz is often used as a division in the scale and all those above 7 are called hard minerals.
1. Talc6.Feldspar
2. Gypsum 7.Quartz
3. Calcite8.Beryl
4.Fluorite 9.Corundum
5.Apatite10. Diamond
Some very familiar objects can be used in conjunction with this scale. A fingernail has the hardness of 2.5, a copper coin between 3 and 4, a nail about 5, common window glass 5.5, a steel file or porcelain tile 6.5. Other minerals are sometimes substituted in the scale such as topaz for beryl since they both have a hardness of 8.

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SKU ED-00002358
Quantity in stock 13 available
Weight 1.05 lbs
Price: $23.80

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I was very satisfied with my purchase. Although shipping took so long, I forgot I had even ordered them, it was worth the wait. Imagine my surprise when I got home one day and 30 boxes of the Sierra Nevada were sitting on my doorstep. Amateurgeologist.com is the best! Thanks for providing such a unique product. So glad I was able to get some of these authentic limited edition Sierra Nevada cobbles before mass wasting destroyed them all, or before glaciation comes back and covers them all up again.
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