X-Ray (n?=2d sin ?) when the interaction of the

X-Ray
Diffraction

X-Ray Diffraction technique is used to determine unknown
compound, crystallographic structure, strain, preferred orientation, atomic
spacing and crystalline grain size.  These
X-rays are produced by a cathode ray tube, filtered to produce monochromatic
radiation, collimated to concentrate, and directed toward the sample. This
techniques satisfies Bragg’s Law (n?=2d sin ?) when the interaction of the
incident rays with the sample produces constructive interference with a
diffracted ray. There are three main components of X-Ray diffractometer which
is X-Ray tube, a sample holder and X-Ray detector. Cathode ray tube bombards
sample with electrons where it will produce X-Ray spectra and as it satisfy the
Bragg Equation, constructive interference and a peak in intensity will occur.
Then the detector detects and process then the output will be shown on the
monitor. Bulk analysis is to know the rock forming mineral and total clay
minerals.

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X-Ray
Diffraction Bulk Analysis of R9815 Sample A

 

 

 

 

 

 

 

 

 

 

 

Graph of Intensity vs 2d Angle of R9815 Sample A
using Copper (Cu) Anode

 

Identified Patterns List:

 

 

Visible

Ref. Code

Score

Compound Name

Displacement
°2Th.

Scale Factor

Chemical Formula

*

98-000-9830

38

Albite high

0.000

0.291

Al1 Na1 O8 Si3

*

98-005-9844

22

Mica

0.000

0.131

H2 Al0.24 Fe3.76 K1 O12 Si3

*

98-015-6166

28

Chlorite IIb-4

0.000

0.103

H16 Al2.78 Fe0.94 Mg11.06 O36 Si5.22

*

01-089-8936

42

Silicon Oxide

0.000

0.176

Si O2

*

01-089-5378

33

Iron Magnesium Manganese Calcium Sodium Silicate Hydroxide
Fluoride

0.000

0.644

( Fe3.112 Mn0.088 Mg1.954 Ca1.814 Na0.018 ) Si7.988 O22.12
( O H)1.860 F0.020                                                     

*

00-029-0862

29

Magnesium Iron Nickel Aluminum Silicate Hydroxide

0.000

0.106

( Mg , Ni , Fe , Al )12 Si6 Al2 O20 ( O H )16

 

 

 

Plot
of Identified Phases:

 

 

 

 

 

 

 

 

Identify phases by their respective reference codes
in comparison to the overall peak list.

Discussion:

The elements present in sample A is albite, mica,
chlorite, silicon oxide, iron, magnesium, manganese, calcium, sodium, silicate,
hydroxide, fluoride, silicate and aluminum.  Chlorite is a critical mineral which might
have undergone chloritization from mica which is caused by metamorphism. The
presence of albite, sodium and hydroxide suggest that this compound does not
originate from basic igneous rock. This rock could be from deep cores of
sedimentary rock basin due to high presence of albite and chlorite. The
formation environment is at convergent plate boundary and subduction zones.  

 

 

X-Ray
Diffraction Bulk Analysis of R9815 Sample B

 

 

 

 

 

 

 

 

Identified
Patterns List:

Visible

Ref. Code

Score

Compound Name

Displacement °2Th.

Scale Factor

Chemical Formula

*

98-003-4870

32

Albite low

0.000

0.291

Al1 Na1 O8 Si3

*

01-089-8936

43

Silicon Oxide

0.000

0.654

Si O2

*

98-005-9844

10

Mica

0.000

0.085

H2 Al0.24 Fe3.76 K1 O12
Si3

*

00-001-0705

22

Potassium Aluminum
Silicate

0.000

0.346

K Al Si3 O8

*

01-070-2129

9

Calcium Aluminum
Silicate

0.000

0.047

Ca Al Al Si O6

 

 

 

 

 

 

 

 

 

 

Plot of Identified Phases:

 

 

 

 

 

 

 

Discussion:

The elements detected in sample B is albite, silicon
oxide, mica, potassium, aluminum, silicate, and calcium. The presence of
silicon oxide, silicates and potassium shows that it might be from felsic igneous
rocks. These rocks are primarily located at convergent zones. The common felsic
rock is granite, rhyolite and dacite. This evidence is supported by the absence
of hydroxide compound that make a rock from sedimentary origins. Igneous rock
forms at high temperature so there is no hydroxide or other hydrous compounds.