Morag Hood :Using the Mohs Hardness Scale, what is the hardness of a nickel (as in piece of money worth 5 cents)
NBushe Wright :4.0
Katie Blake :Reference here:
Tori Spelling :http://en.wikipedia.org/wiki/Nickel
Leticia Huijara :Look under Miscellaneous.
Corrinne Russell :Hope this helped, please don't forget to choose a best answer! :-)
Jill Schoelen :Rather than giving you the answer, since you already have it, I would rather teach you how to find the answer without using the internet!
Summer Makovkin :What materials do you have that have a known hardness?
Fumie Kudo :Your fingernail is about 2.5, so you know the nickel is harder than that.
Debbie Nassar :A copper penny is about 3.5, so you know the nickel is harder than that!
Rosalind Halstead :Window glass is about 5-5.5, and a typical knife blade is about 5.5. My knife scratches the nickel, but my nickel won't scratch glass. It may be less than 5 in hardness. If I had a piece of fluorite I expect I would find that the nickel and the fluorite would both barely scratch the other. The nickel should be a hardness near 4, and less than 5. Keep in mind that some minerals have a range of hardness. It may vary by as much as 1 depending on the impurities in the mineral.
Ciara OCallaghan :The lesson here is to learn what common items you have to test with, and if you have a test kit, to be sure you are familiar with the different hardnesses, and be able to interpret the scratch. There is a difference between a dust trail and a scratch. Be familiar with that.
Elizabeth Cromwell :Look at this page:
Lisa Bingley :http://mineral.galleries.com/minerals/hardness.htm
Jessica Hahn :To remember Moh's scale:
Madeleine James :The Geologist Can Find An Ordinary Quartz (that) Tourists Call Diamond
Dana Gillespie :Talc-Gypsum-Calcite-Fluorite-
Ava Cohen-Jonathan :Apatite-Orthoclase-Quartz-Topaz-
Chelsey Hampshire :Corundum-Diamond
Heather-Elizabeth Parkhurst :Okay...there's probably a better one but I forgot it.
Heidi Sjursen :The relative hardness of minerals is determined according to the Mohs scale of hardness. In the Mohs scale?named after the German mineralogist, Friedrich Mohs, who devised it?ten common minerals are arranged in order of increasing hardness and are assigned numbers: 1, talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, orthoclase (feldspar); 7, quartz; 8, topaz; 9, corundum; and 10, diamond. The hardness of a mineral specimen is obtained by determining which mineral in the Mohs scale will scratch the specimen. Thus, galena, which has a hardness of 2.5, can scratch gypsum and can be scratched by calcite. The hardness of a mineral largely determines its durability.
Joey Heatherton :In metallurgy and engineering, hardness is determined by impressing a small ball or cone of a hard material on the surface to be tested and measuring the size of the indentation. Hard metals are indented less than soft metals. This test to determine the hardness of metal surfaces is known as the Brinell test, named after the Swedish engineer, Johann Brinell, who invented the Brinell machine for measuring the hardness of metals and alloys.