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Originally posted by WinstontheDog
For the socialist, lefty sceptics, buy a chunk of pink granite and a two foot length of coper pipe, a hammer and peck away.
This mineral cannot be scratched by a knife blade but it can easily be scratched with window glass. It is found in most igneous rocks, and is an essential component of crystalline rocks such as granite, gabbro, and basalt.
This is the most common mineral and often the most beautiful. It will easily mark steel and hard glass. Quartz makes up the sand on our seashores and is found in sandstone and quartzite. Some varieties of quartz are used as gemstones. These include amethyst, bloodstone, crystal, flint, and onyx.
kinda funny the summarians had "bagdad batterys" for electroplating with lemon juice and such and the egyptions use flint tools .Eh need me a time machine to go back and observe them else its all speculation.
In four days of continous operation it couldn't cut a visable line in a piece of off cut kitchen unit "granite" sourced from a very upmarket supplier. This bit of kit had a tungstan carbide blade lubricated with industrial diamond "dust". It was putting around 4kn/mm 2 pressure at 30 cycles per minute but hardly scratched the "granite".