HARDNESS PENCIL 5
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-5
Test range: 5 - 9 Mohs Scale
Hardness pencil: apatite-5; orthoclase-6; quartz-7; topaz-8; corundum-9.
Size: 170 x 120 x 35 mm
Weight: 170 g
