Scale of Hardness W/O Diamond Rock Mineral Collection

Scale of Hardness W/O Diamond Rock Mineral Collection

Overview

Nine specimens ordered from softest to hardest according to Mohs hardness scale for detailed examination

Warnings

Scale of Hardness W/O Diamond Rock Mineral Collection

Regular price $17.95 In Stock
or
Reviews Read Reviews

Overview

Nine specimens ordered from softest to hardest according to Mohs hardness scale for detailed examination

Warnings

Product Details

Quantity:  1 Set of 9 Rock and Mineral Samples 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. 
 
Here is the list of rocks and minerals in this set and their measured hardness:
  • Talc - 1
  • Feldspar - 6
  • Gypsum - 2
  • Quartz - 7
  • Calcite -3 
  • Beryl - 8
  • Fluorite - 4
  • Corundum - 9
  • Apatite - 5
  • Diamond - 10 (The Diamond sample is NOT in this set.)
Samples measure approximately 1 x 1 - 1/2 inches.  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.
  • Grades 6-12
  • Samples are numbered, and a chart is included for easy identification.

Additional Information

SKU

RCAEP-2357

Weight

2.0 lb

​ ​