Sample Foliated? Mineral Key Characteristics Rock Name H(Yes or No) Composition
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Question
Sample Foliated? Mineral Key Characteristics Rock Name H(Yes or No) Composition 18 Yes 20 Y [Table 4 | Metamorphic Rock Identification] Now that you have identified the name and mineral composition of each metamorphic rock in your kit, try to identify one igneous or sedimentary rock in your kit that could have been the protolith for each metamorphic rock. For many samples, there may be more than one acceptable answer, and some rocks could be protoliths for multiple metamorphic rocks. Use the mineral/lon composition of each rock as a guide for making your selections. (See Figure 9, p 5-19.) You may also want to look up the chemical compositions of the minerals in each rock to determine what ions comprise each mineral. (See QR Code, p. 5-19.) Record your answers in Table 5, below ACTIVITY #4 Minerals or lons Present in Both Rocks Protolith Sample Metamorphic Rock Name (Name/Sample #) 18 mes 19 ShisS 20 Stue 22 Mabu able 5 I Identification of Protoliths]Explanation / Answer
Answer:
TABLE 4-
Sample
#
Foliated
(Yes or No)
Mineral Composition
Key Characteristics
Rock Name
18
Yes
Medium to coarse grained; Feldspar and quartz mainly; pyroxene, amphibole minerals also present.
Gneissose structure i.e. alternating bands of micaceous minerals and equidimensional minerals like quartz, feldspar etc.
Gneiss
19
Yes
Fine to medium grained ;Micas, chlorite, hornblende; quartz, feldspar in small amount.
Schistose structure i.e. parallel arrangement of elongated or flaky minerals like muscovite, biotite, chlorite etc.
Schist
20
Yes
Extremely fine grained; mica, chlorite and small amount of quartz, feldspar etc.
slaty cleavage i.e. readily split into thin sheets.
Slate
21
No
Medium to coarse grained; Quartz(mainly), feldspar, mica, etc.
Granular structure; hard; chiefly composed of quartz.
Quartzite
22
No
Medium to coarse grained;calcite(mainly), olivine, garnet etc.
Granulose structure i.e. predominance of equigranular minerals such as calcite etc.
Marble
TABLE 5-
Sample
#
Metamorphic Rock Name
Protolith
Minerals or Ions Present in Both Rocks
18
Gneiss
Varieties of parent rocks like- sandstones, conglomerates, granites, rhyolites etc.
Quartz, feldspar
19
Schist
Argillaceous sedimentary rocks like clays, shales.
Quartz, feldspar
20
Slate
Argillaceous sedimentary rocks like clays, shales.
Quartz, feldspar
21
Quartzite
Sandstone.
Mainly quartz; feldspar, mica, garnet in small amount.
22
Marble
Carbonate group of sedimentary rocks like limestone.
Calcite.
Sample
#
Foliated
(Yes or No)
Mineral Composition
Key Characteristics
Rock Name
18
Yes
Medium to coarse grained; Feldspar and quartz mainly; pyroxene, amphibole minerals also present.
Gneissose structure i.e. alternating bands of micaceous minerals and equidimensional minerals like quartz, feldspar etc.
Gneiss
19
Yes
Fine to medium grained ;Micas, chlorite, hornblende; quartz, feldspar in small amount.
Schistose structure i.e. parallel arrangement of elongated or flaky minerals like muscovite, biotite, chlorite etc.
Schist
20
Yes
Extremely fine grained; mica, chlorite and small amount of quartz, feldspar etc.
slaty cleavage i.e. readily split into thin sheets.
Slate
21
No
Medium to coarse grained; Quartz(mainly), feldspar, mica, etc.
Granular structure; hard; chiefly composed of quartz.
Quartzite
22
No
Medium to coarse grained;calcite(mainly), olivine, garnet etc.
Granulose structure i.e. predominance of equigranular minerals such as calcite etc.
Marble
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