Diamond !... DIamond is the hardest (known) natural element on the planet. Small pieces of diamond help the drill bit cut though tough obstacles such as rock.
garnets
Diamond is a very hard white mineral.
Very soft mineral
yes. it is very hard and will cut even if very hot and at red heat. it is mainly used for cutting tools such as drills.
Corundum is a very hard mineral used as an abrasive in industry.
it drills it but not very effectively
Home Depot sells a variety of cordless Drills. Lexington Drills are very accurate. Sterling Drills have a very long charge. These drills are not very expensive.
A six-sided mineral crystal may be a naturally occurring form of quartz, which is a very hard mineral. Quartz is widely known for its six-sided crystal structure and its hardness, which ranks 7 on the Mohs scale of hardness. It is commonly used in jewelry and as a component in various industrial applications.
garnet
it was very hard for the kidsit was a very different matter as to what school life is like today. there were a lot of gas drills and lots of schools were used as basic vegtable growing places.Children had to take reuglar gas drills at school. The war had an effect on the kind of games they played and the rhymes they told.
It's a quarts. This isn't much info but maybe this will help
A six-sided mineral crystal that is very hard is typically referred to as a hexagonal crystal. One common example of a hard mineral with this crystal structure is quartz, which has a hardness of 7 on the Mohs scale. Another example is beryl, which includes varieties like emerald and aquamarine. These minerals are characterized by their distinct six-sided (hexagonal) symmetry and exceptional durability.