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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 |
3.088(28.89) | 200 | 5.112(17.33) | 200 | 5.984(14.79) | 120 | Glagolevite | NaMg6[Si3AlO10](OH,O)8·H2O |
3.096(28.81) | 200 | 3.626(24.53) | 200 | 5.880(15.05) | 200 | Lewisite | (Ca,Fe++,Na)2(Sb,Ti)2O7 |
3.100(28.77) | 200 | 5.044(17.57) | 200 | 3.610(24.64) | 184 | Sabelliite | Cu2Zn(As,Sb)O4(OH)3 |
3.104(28.74) | 200 | 3.636(24.46) | 200 | 5.900(15.00) | 200 | Uranmicrolite | (U,Ca)2(Ta,Nb)2O6(OH) |
3.148(28.33) | 200 | 5.240(16.91) | 200 | 5.840(15.16) | 180 | Calderite | (Mn++,Ca)3(Fe+++,Al)2(SiO4)3 |
3.174(28.09) | 200 | 3.680(24.16) | 200 | 6.080(14.56) | 200 | Cesstibtantite | (Cs,Na)SbTa4O12 |
3.180(28.04) | 200 | 3.600(24.71) | 200 | 4.260(20.83) | 200 | Lindsleyite | (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 |
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