kbrow50 kbrow50 02-05-2019 Chemistry contestada PLZ HELP ME!!! I'll give brainliest to whoever answers this along with 15 points! Talc (asphalt) gypsum (fingernail) calcite (copper coin) fluorite apatite (knife blade) feldspar (steel file) quartz topaz corundum diamond Which of the substances listed above are pure elements?