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X-Ray Diffraction of Keokuk Geode Samples, Part 2 of 3

Last Updated: 4th Feb 2012

By Keith A. Peregrine

A second geode was analyzed, producing the following results:

Sample 1. Pere02 Ankerite Geode
03936610014949500383169.jpg
Hamilton area geode


07657290015660176219877.png
Ankerite X-Ray Diffraction Graph

Graph Pere02

X-Ray Diffraction Pere01

Pos.[2Th.]Height[cts]FWHM [2Th.]d-spacing [A] Rel.Int.[%]
21.30744.260.94464.170101.42
23.82451.790.94463.734910.60
29.708173.640.23623.0072724.57
30.8619283.380.17712.8974394.57
39.75379.960.39362.267463.32
40.953919.580.19682.203746.53
43.46316.960.23622.082162.32
44.801514.870.23622.023024.96
50.282217.050.39361.814615.69
50.897424.530.38401.792638.19


Visible Ref. Code Score Compound Name Chemical Formula
*12-008875Ankerite Ca(Mg0.67 Fe0.33 +2)(CO∧3)∧2
*71-166333Calcite magnesian Mg0.1 Ca0.9 CO∧3

X-Ray Diffraction was performed by Attard's Minerals.


Return to Keith A. Peregrine's Article Index


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