X-Ray Diffraction Table |
See Help on X-Ray Diffraction.
Powder X-ray Diffraction (XRD) is one of the primary techniques used by mineralogists and solid state chemists to examine the physico-chemical make-up of unknown materials. This data is represented in a collection of single-phase X-ray powder diffraction patterns for the three most intense D values in the form of tables of interplanar spacings (D), relative intensities (I/Io), mineral name and chemical formulae
The XRD technique takes a sample of the material and places a powdered sample in a holder, then the sample is illuminated with x-rays of a fixed wave-length and the intensity of the reflected radiation is recorded using a goniometer. This data is then analyzed for the reflection angle to calculate the inter-atomic spacing (D value in Angstrom units - 10-8 cm). The intensity(I) is measured to discriminate (using I ratios) the various D spacings and the results are compared to this table to identify possible matches. Note: 2 theta (Θ) angle calculated from the Bragg Equation, 2 Θ = 2(arcsin(n λ/(2d)) where n=1
For more information about this technique, see X-Ray Analysis of a Solid or take an internet course at Birkbeck College On-line Courses. Many thanks to Frederic Biret for these data.
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D1 Å (2θ) |
I1 %) |
D2 Å (2θ) |
I2 (%) |
D3 Å (2θ) |
I3 (%) |
Mineral | Formula |
2.880(31.03) | 180 | 5.680(15.59) | 180 | 3.380(26.35) | 170 | Romanite | (Fe++,U,Pb)2(Ti,Fe+++)O4 |
2.900(30.81) | 200 | 4.960(17.87) | 200 | 4.086(21.73) | 180 | Bityite | CaLiAl2(AlBeSi2)O10(OH)2 |
2.970(30.06) | 200 | 19.540(4.52) | 200 | 6.340(13.96) | 200 | Brammallite | (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] |
2.972(30.04) | 200 | 4.100(21.66) | 200 | 4.300(20.64) | 200 | Niggliite | PtSn |
2.974(30.02) | 200 | 3.186(27.98) | 200 | 5.800(15.26) | 180 | Shuiskite | Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) |
2.988(29.88) | 200 | 5.840(15.16) | 160 | 16.600(5.32) | 120 | Chrysocolla | (Cu,Al)2H2Si2O5(OH)4·n(H2O) |
2.990(29.86) | 200 | 2.408(37.31) | 180 | 5.660(15.64) | 140 | Luanheite | Ag3Hg |
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