HARDNESS PENCIL 8
For testing the hardness scale of minerals. Hardness pencils are pencils with a tip made of one of the minerals on Mohs Scale.
BENEFITS AND FEATURES
These pencils are used to try and scratch a stone and observe if the pencils can scratch the gem.
Since this is a destructive method (it leaves a scratch), this test is mostly used on pieces of rough or on a inconspicuous place on the gemstone. Not many gemologists use this test as there ways to determine a gemstone’s identity.
Model: HP-8
Test range: 3 - 10 Mohs Scale
Hardness pencil: calcite-3; fluorite-4; apatite-5; orthoclase-6; quartz-7; topaz-8; corundum-9; diamond-10.
Size: 170 x 120 x 35 mm
Weight: 190 g
