Energy Dispersive Spectrometry of Common Rock Forming by Kenneth P. Severin

By Kenneth P. Severin

This booklet offers a truly simple advent to electron microscopy and effort dispersive spectrometry (EDS). It has the biggest compiled selection of EDS spectra ever released and covers most typical rock forming minerals. additionally, it offers a key to assist the amateur battle through the big variety of spectra.

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KEY FOR IDENTIFYING MINERALS USING EDS Minerals marked N/A do not have spectra but should be considered as possibilities Is Silicon a major component? Yes: Go to Section I, Silicates No: Go To Section II - Non Silicates (Oxides, sulphides, carbonates, phosphates, spinels, halides) Section I, Silicates 1) Is there an Aluminum peak? 0[(Al,Si)8O20](OH4˜8H2O) Pages 129, 130 No: 13 13) Large Iron Peak? Yes: Garnets: Almandine Fe3+2Al2Si3O12 Page 50 Andradite Ca3(Fe+3,Ti)2Si3O12 Page 53 Epidotes CaFe+3Al2O•OH[Si2O7][SiO4] Pages 69-75 No: Garnets: Grossular Ca3Al2Si3O12 Page 52 Hydrogrossular Ca3Al2Si2O8(SiO4)1-m(OH)4m N/A Epidotes: Zoisite Ca2Al•Al2O•OH[Si2O7][SiO4] Page 69 Clinozoisite Ca2Al•Al2O•OH[Si2O7][SiO4] Page 70 Lawsonite CaAl2(OH)2[Si2O7]H2OPage 76 Melilite Page 78 Gehlenite Ca2[Al2SiO7] N/A Pyroxenes Page 86-96 Amphiboles Page 102-111 Margarite Ca2Al4[Si4Al4O20](OH)4 Page 119 Prehnite Ca2Al[AlSi3O10](OH)2 Page 132 14) Contains Magnesium Yes: Glaucophane Na2Mg3Al2[Si8O22](OH)2 Page 111 29 30 Chapter 3 No: 15 15) Is Potassium >> Sodium?

KEY FOR IDENTIFYING MINERALS USING EDS Minerals marked N/A do not have spectra but should be considered as possibilities Is Silicon a major component? Yes: Go to Section I, Silicates No: Go To Section II - Non Silicates (Oxides, sulphides, carbonates, phosphates, spinels, halides) Section I, Silicates 1) Is there an Aluminum peak? 0[(Al,Si)8O20](OH4˜8H2O) Pages 129, 130 No: 13 13) Large Iron Peak? Yes: Garnets: Almandine Fe3+2Al2Si3O12 Page 50 Andradite Ca3(Fe+3,Ti)2Si3O12 Page 53 Epidotes CaFe+3Al2O•OH[Si2O7][SiO4] Pages 69-75 No: Garnets: Grossular Ca3Al2Si3O12 Page 52 Hydrogrossular Ca3Al2Si2O8(SiO4)1-m(OH)4m N/A Epidotes: Zoisite Ca2Al•Al2O•OH[Si2O7][SiO4] Page 69 Clinozoisite Ca2Al•Al2O•OH[Si2O7][SiO4] Page 70 Lawsonite CaAl2(OH)2[Si2O7]H2OPage 76 Melilite Page 78 Gehlenite Ca2[Al2SiO7] N/A Pyroxenes Page 86-96 Amphiboles Page 102-111 Margarite Ca2Al4[Si4Al4O20](OH)4 Page 119 Prehnite Ca2Al[AlSi3O10](OH)2 Page 132 14) Contains Magnesium Yes: Glaucophane Na2Mg3Al2[Si8O22](OH)2 Page 111 29 30 Chapter 3 No: 15 15) Is Potassium >> Sodium?

Methods such as X-ray diffraction or examination of crystal morphology (see Welton, 1984) may be needed if these minerals must be precisely differentiated. After determining which elements are present in the spectrum and accounting for probable undetected elements, estimate relative elemental abundance by comparing peak heights. , comparing KD to KD or LD to LD, but not KD to LD) are valid. The estimate of relative abundance will be approximate even within a single family of lines because of differences in X-ray generation and detector efficiency at different energies.

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