Title: HighSchool Author: Administer Last modified by: Plusone Created Date: 7/27/2005 2:06:06 PM Document presentation format ... – PowerPoint PPT presentation
1 (No Transcript) 2 ??????????????????????????????????? ???????? (??????????????????) ? ??????????????????????????? ??????????????????????????????????????? ??????????? ??? ???????????????? ?????????????? ????????????????????? ????????? 1MINERAL AND ROCK I
23 ?????????????? (specific gravity) Specific gravity is the density of a substance divided by the density of water (1 g/cm3). ??????? (quartz) 2.65 ?????? (pyrite) 5.0-5.2 24 ???????????????
Friedrich Mohs (1773-1839) German geologist/mineralogist.Mohs, studied chemistry, mathematics and physics. He started classifying minerals by their physical characteristics, in spite of their chemical composition, as it was done before. He created a hardness scale that is still used as Mohs scale of mineral hardness.
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