The rock is a meta-siltstone. It has experienced low grade metamorphism. The rock did not exhibit clear foliation, like a schist or phyllite would. It did have flakey mica minerals that alluded to the metamorphism it experienced. The likely mineralogy includes quartz and micas (including muscovite and other sheet minerals that are metamorphic in origin). please fill out the table EE9360 A (Coupled TwoTheta/Theta) EES360 A (Coupled Two Theta/Theta) 2a. What are the four minerals identified by the progran, and their relative proportions? List them in the table below. 2b. Search the Mindat.org database for each mineral. Seroll down to the X-ray Powder Diffraction section. Record the d spacings of the three most intense diffraction peaks for each and write them in the table below. Calculate and 20 and write them in the toble. 2c. Compare the enlarged XRD pattern and label the three most intense peaks that correspond to each mineral. Check that eoch peak is present to confirm the computer's identification of the minerals. Gty 3 se Minalogy X-noy Diffroction Lob III Identificatioe of Uhknown Minerelt in Rocks uning XRD - Focensic Mineralogy" The X -roy diffraction pottern of a moierel is as unique to a mineral es o fingerprint or 0 NA are po a huenon being. We ute fingerprint and DNA evidente in comvicting criminal suspects: Therefere we can uee the XaD pattern to confirm suipeet minerely in any sold stbstance neck, sail, sediment, manufactured solids (ceranics semiconductors), etc. Rocker and sediment. prerent a challenge becouta they consirt of multiple minerals that produce e complex diffraction petterm with multiple peabe. Hewever, becaude the diffraction pattern of every minerai la knewn ond catalogued, compofer programi cen generate a kett fif of mixturer of minerals ta mateh the diffraction pettem of the unkhown sumple. This is essentially torensic mineralogyC. We can elso use the SEM to characterize the uninoun. In this lob we will demonstrate the "bert-fit" process of identifying the minenals in a fintfrained rock, ond their relative proportions (the rocks "mode" I mineralt present and their. velume preportions). We enll collect the XPD partern on the research-grode X -ray diffrectometer housed at the kentucky feslogical Survey. Sof fmare mill be used to identify the mineruls peesent and their relative proportions. Your will check the accurocy of the cemputer's identifications using the fop three diffrocticn peaks for each muneral that are compiled at nuw mindat ong. Ia. The sample was collected netar the tewn of Rangeley, Maine, and ia s sample of the Rangeloy Formation. What type of rockis the Rangeley Fernation? Ib. Edsed en the samples appeanance (texture, mineralogy), reduce the possible rock types to a likely few, eg, not marble, nat peridotife, ete Ic. Based on diseussion in class, what is the rock type and likely minerology? 2. The sample was powdered and andlyzed on the KGS's X -ray diffroctemeter. [The full diffraction patfern an.

1. The rock is a meta-siltstone. It has experienced low grade metamorphism. The rock did not
exhibit clear foliation, like a schist or phyllite would. It did have flakey mica minerals that
alluded to the metamorphism it experienced.
The likely mineralogy includes quartz and micas (including muscovite and other sheet minerals
that are metamorphic in origin).
please fill out the table
EE9360 A (Coupled TwoTheta/Theta) EES360 A (Coupled Two Theta/Theta) 2a. What are the
four minerals identified by the progran, and their relative proportions? List them in the table
below. 2b. Search the Mindat.org database for each mineral. Seroll down to the X-ray Powder
Diffraction section. Record the d spacings of the three most intense diffraction peaks for each
and write them in the table below. Calculate and 20 and write them in the toble. 2c. Compare the
enlarged XRD pattern and label the three most intense peaks that correspond to each mineral.
Check that eoch peak is present to confirm the computer's identification of the minerals. Gty 3 se
Minalogy X-noy Diffroction Lob III Identificatioe of Uhknown Minerelt in Rocks uning XRD -
Focensic Mineralogy" The X -roy diffraction pottern of a moierel is as unique to a mineral es o
fingerprint or 0 NA are po a huenon being. We ute fingerprint and DNA evidente in comvicting
criminal suspects: Therefere we can uee the XaD pattern to confirm suipeet minerely in any sold
stbstance neck, sail, sediment, manufactured solids (ceranics semiconductors), etc. Rocker and
sediment. prerent a challenge becouta they consirt of multiple minerals that produce e complex
diffraction petterm with multiple peabe. Hewever, becaude the diffraction pattern of every
minerai la knewn ond catalogued, compofer programi cen generate a kett fif of mixturer of
minerals ta mateh the diffraction pettem of the unkhown sumple. This is essentially torensic
mineralogyC. We can elso use the SEM to characterize the uninoun. In this lob we will
demonstrate the "bert-fit" process of identifying the minenals in a fintfrained rock, ond their
relative proportions (the rocks "mode" I mineralt present and their. velume preportions). We enll
collect the XPD partern on the research-grode X -ray diffrectometer housed at the kentucky
feslogical Survey. Sof fmare mill be used to identify the mineruls peesent and their relative
proportions. Your will check the accurocy of the cemputer's identifications using the fop three
diffrocticn peaks for each muneral that are compiled at nuw mindat ong. Ia. The sample was
collected netar the tewn of Rangeley, Maine, and ia s sample of the Rangeloy Formation. What
type of rockis the Rangeley Fernation? Ib. Edsed en the samples appeanance (texture,
mineralogy), reduce the possible rock types to a likely few, eg, not marble, nat peridotife, ete Ic.
Based on diseussion in class, what is the rock type and likely minerology? 2. The sample was
powdered and andlyzed on the KGS's X -ray diffroctemeter. [The full diffraction patfern and an
enlarged region of the pattern are atfoched to this lob.] We will observe the process of arriving at
a "best-fit" identification of the primary minenals in the sarple and their relative proportions, as
demonstrated by Mr. Jason Bockus, the heod of the XGS labaratory services. EES360 A
(Coupled TwoTheta/Theta) 2Theta (Coiopled Two Thetartectai WHL = 1 rabco EES360 A
(Coupled TwoTheta/Theta) 2a. What are the four minerals identified by the program, and their
relative proportions? List them in the table below. 2b. Search the Mindat org database for each
mineral. Seroll down to the X-roy Powder Diffraction secfion. Record the d spacings of the three
most intense diffraction peaks for each and write them in the table below. Colculate and 2 and
write them in the table. 2c. Compare the enlarged XRD pattern and label the three most intense
peoks that correspond to each mineral. Check that each peak is present to confirm the computer's
identification of the minerals. GLy 360 Mineralogy X -ray Diffraction Lab III Identification of

2. "Unknown" Minerals in Rocks using XRD - "Forensic Mineralogy" The X -ray diffroction
pattern of a mineral is as unique to a mineral as a fingerprint or DNA are to a human being. We
use fingerprint and DNA evidence in convicting eriminal suspects. Therefore we can use the
XRD pattern to confirm suspect minerals in any solid substance rock, soil, sediment,
manufactured solids (ceramics semicenductors), etc. Rocks and sediment present a challenge
because they consist of multiple minerals that produce a complex diffraction pattern with
multiple peaks, However, becouse the diffraction pattem of every mineral is known and
catalagued, computer programs con genenate a best fit of mixtures of minerals to match the
diffraction pottern of the unlenown sample. This is essentially "forensic mineralogy". We can
aiso use the SEM to characterize the unkowow. In this lab we will demonstrate the "best-fit"
process of identifying the minerais in a finegrained rock, and their relative proportions (the rock's
"mode" = minerals present and their volume proportions). We will collect the XRD pottern on
the research-grade X -ray diffractometer housed at the Kentucky Geological Survey. Sof tware
will be used to identify the minerals present and their relative proportions. You will check the
aceuracy of the computer's identifications using the top three diffraction peaks for each mineral
that are compiled at wwwinindatorg. 1a. The sample was collected near the town of Rangeley,
Maine, and is a sample af the Rangeley Formation. What type of rock is the Rangeley
Formation? 1b. Based on the sample's appearance (texture, mineraiogy), reduce the possible rock
types to a likely few, e.g. not marble, not peridotite, cte. Ic. Based on discussion in class, what is
the rock type and likely mineralogy? 2. The sample was powdered and analyzed on the KGS's X
-ray diffroctometer. [The full diffraction pattern and an enianged region of the pattern are
attached to this lab.1 We will observe the process of arriving at a "best-fit" identification of the
primary minerals in the sample and their relative proportions, as demonstrated by Mr. Jason
Backus, the head of the KGS laboratory services.