What Am I? Season 2 Epsiode 3

Below I’ve listed the key  elements found in a common item as mass percentages.  See if you can guess what this is!  If no one gets it within 24 hours, I will post a clue.  If you guess on Twitter (@kjhaxton), please DM your guess so others can play.

Oxygen 65 Carbon 18  Hydrogen 10  Nitrogen 3  Calcium 1.4 Phosphorus 1.1 Potassium 0.25 Sulfur 0.25 Sodium 0.15  Chlorine 0.15  Magnesium 0.05 Iron 0.006 Fluorine 0.0037 Silicon 0.002  Rubidium 0.00046 Strontium 0.00046 bromine 0.00029  Lead 0.00017 Copper 0.0001  Aluminium 0.000087 Cadmium 0.000072 Cerium 0.000057 Barium 0.000031  Tin 0.000024  Iodine 0.000016 Titanium 0.000013  Boron 0.000069  Selenium 0.000019 Nickel 0.000014 10 Chromium 0.0000024 Manganese 0.000017 Arsenic 0.000026 Lithium 0.0000031Caesium 0.0000021 6e-6 1.0e-7 7e18 No Molybdenum 0.000013 Germanium 0.000005 Antimony 0.000011 Silver 0.000001 Niobium 0.00016 Zirconium 0.0006 Lanthanum 8e-7 Tellurium 0.000012  Gallium 7e-7 Yttrium 6e-7 Bismuth 5e-7 Thallium 5e-7 Indium 4e-7 Gold 0.000014 Scandium 2e-7 Tantalum 2e-7 Vanadium 0.000026 Thorium 1e-7 Uranium 1.3e-7 Samarium 5.0e-8 Tungsten 2.0e-8  Beryllium 5e-9  Radium 1e-17

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