4. For the kyanite-bearing metapelite in your Tellus II rock box, list the appro

Question

4. For the kyanite-bearing metapelite in your Tellus II rock box, list the approximate proportions of each of its constituent minerals. Use these data, the chemical formula of typical specimens of common rock-forming minerals found in metapelites provided and a periodic table to estimate the bulk composition of each specimen. Begin by converting from volume to weight of each mineral in each specimen. Then calculate the weight of each oxide in each specimen. For simplicity, we will work with Mg end members. Suggest a protolith for each specimen by comparing its bulk compositions with the bulk compositions of typical specimens of igneous and sedimentary rocks provided (7 credits). In the following table, enter the weight of each of the following minerals which are found in your rock: How do I convert from volume to weight For each specimen, 1) multiply the volume of each mineral by its density, and 2) divide each value you obtain by the sum of these values for the minerals in the specimen. Minera Chemical formula Molume percent (vol. Density (g/cm3) Weight percent (wt. Chlorite* MRSALIZSI3010 (OH)8 o 3.0 Garnet* Mg3Al Si3012 Staurolite Mg2Algsi4023(OH) Al2Sios Kyanite Sillimanite Al2SiO5 2.7 covite KAL3si 3010(OH)2 o SiO2 Quartz 2.7 Chlorite, biotite, garnet and staurolite are shown as Mg end members for simplicity. The chemical formula of staurolite has been simplified.

Explanation / Answer

The calculation is as above

lower limit upper limit lower limit upper limit lower limit upper limit lower limit upper limit average Mineral Vol % from Vol% to Density vol% * density vol% * density vol%*density*100 vol%*density*100 vol*density*100/157 vol*density*100/345 Chlorite Biotite 10 30 3 30 90 3000 9000 19.10828025 26.08695652 22.59762 Gamel 0 0 0 0 Staurlite 0 0 0 0 Kyanite 5 10 3.6 18 36 1800 3600 11.46496815 10.43478261 10.94988 Stillimanite 0 0 0 0 Musovite 10 30 2.8 28 84 2800 8400 17.8343949 24.34782609 21.09111 Quartz 30 50 2.7 81 135 8100 13500 51.59235669 39.13043478 45.3614 total 157 345

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