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- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/02%3A_Using_the_Petrographic_Microscope/2.07%3A_Properties_Under_Cross_Polarized_LightIf you are unsure of the interference color, it can be helpful to look at the edges of the mineral grain, which may show interference color banding that can help narrow down the color. From this point...If you are unsure of the interference color, it can be helpful to look at the edges of the mineral grain, which may show interference color banding that can help narrow down the color. From this point, follow the diagonal line to the top of the chart to determine the birefringence value, and to see minerals with this birefringence.
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex/4.10%3A_BC_Bu_31_(Upper_Zone)HAND SAMPLE IMAGES AND VIDEOS THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL. 2nd image = XPL. Spot 1 Spot 2 Spot 3 THIN SECTION SC...HAND SAMPLE IMAGES AND VIDEOS THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL. 2nd image = XPL. Spot 1 Spot 2 Spot 3 THIN SECTION SCANS Click on the image for a larger, downloadable version. Top image = plane polarized light. Second image = cross polarized light. Third image = juxtaposition of ppl and xpl. Thin section is 2.54 cm wide (distance from top to bottom of image). Query \PageIndex1
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/05%3A_Southwestern_Virginia_Case_Study/5.14%3A_Unicoi_3_ConglomerateThere are at least two conglomerate beds in this outcrop. These images show the conglomerate with the larger (cm-sized) clast size. The videos below show both the larger and smaller clast sizes. The t...There are at least two conglomerate beds in this outcrop. These images show the conglomerate with the larger (cm-sized) clast size. The videos below show both the larger and smaller clast sizes. The thin section images are from the smaller clast size conglomerate. The volcanics are from the Mount Rogers complex – remember this from the history of magmatism in VA? The shale clast is on the left – it’s the darker clast.
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/02%3A_Using_the_Petrographic_Microscope/2.09%3A_Atlas_of_Minerals_in_Thin_SectionNow that you are familiar with how to use a petrographic microscope and some of the optical characteristics that can be observed for minerals, it is possible to identify minerals under the polarizing ...Now that you are familiar with how to use a petrographic microscope and some of the optical characteristics that can be observed for minerals, it is possible to identify minerals under the polarizing light microscope (or at least to eliminate some possibilities). In the next section of this chapter (2.10) there is a student synthesis assignment in which students compile their own tables and criteria to distinguish commonly-occurring rock-forming minerals.
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex/4.01%3A_BC_Bu_3_(Critical_Zone)HAND SAMPLE IMAGES AND VIDEOS Click on the image for a larger, downloadable version. THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL...HAND SAMPLE IMAGES AND VIDEOS Click on the image for a larger, downloadable version. THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL. Please note: this thin section is a bit thick. Plagioclase has first-order yellow colors in some images. Top image = plane polarized light. Second image = cross polarized light. Third image = juxtaposition of ppl and xpl. Thin section is 2.54 cm wide (distance from top to bottom of image).
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex/4.03%3A_BC_Bu_19_(Critical_Zone)HAND SAMPLE IMAGES AND VIDEOS THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL. 2nd image = XPL. Spot 1 Spot 2 THIN SECTION SCANS Top...HAND SAMPLE IMAGES AND VIDEOS THIN SECTION IMAGES AND VIDEOS Images were obtained using a 4x objective (40x total magnification). 1st image = PPL. 2nd image = XPL. Spot 1 Spot 2 THIN SECTION SCANS Top image = plane polarized light. Second image = cross polarized light. Third image = juxtaposition of ppl and xpl. Thin section is 2.54 cm wide (distance from top to bottom of image). Query \PageIndex1
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex/4.05%3A_BC_Bu_18_(Basal_Zone)HAND SAMPLE IMAGES AND VIDEOS No hand sample available. We only have a thin section! THIN SECTION IMAGES AND VIDEOS None available. I forgot to bring it home to scan! THIN SECTION SCANS Click on the i...HAND SAMPLE IMAGES AND VIDEOS No hand sample available. We only have a thin section! THIN SECTION IMAGES AND VIDEOS None available. I forgot to bring it home to scan! THIN SECTION SCANS Click on the image to bring up a larger version. Top image = plane polarized light. Second image = cross polarized light. Third image = juxtaposition of ppl and xpl. Thin section is 2.54 cm wide (distance from top to bottom of image). Query \PageIndex1
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/04%3A_Bushveld_Igneous_Complex/4.12%3A_UG2_(Platinum_Ore_Layer)HAND SAMPLE IMAGES AND VIDEOS
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/05%3A_Southwestern_Virginia_Case_Study/5.02%3A_UM1_Soapstone_and_SerpentiniteCan you see the very weak foliation of the rock in the 1st picture (best observed in the left side of the photo)? The “bumpy” texture seems to be due in part to the weathering of the inhomogeneous roc...Can you see the very weak foliation of the rock in the 1st picture (best observed in the left side of the photo)? The “bumpy” texture seems to be due in part to the weathering of the inhomogeneous rock. If you watch the YouTube video of the hand sample, clasts of ultramafic rock (peridotite?) are surrounded by reaction rims of serpentine. However, you can see some of the minerals in the main section of the rock here.
- https://geo.libretexts.org/Bookshelves/Geology/Introduction_to_Petrology_(Johnson_and_Liu)/05%3A_Southwestern_Virginia_Case_Study/5.05%3A_Geologic_MapThis is the map of the area (without annotations): Here is an annotated map of the area, showing approximate sample locations and towns, as well as the Fries Fault and major structural units: The map ...This is the map of the area (without annotations): Here is an annotated map of the area, showing approximate sample locations and towns, as well as the Fries Fault and major structural units: The map and field descriptions of this area (by Stose and Stose) are available here: https://www.dmme.virginia.gov/commercedocs/BUL_72.pdf Like most map bulletins, the text is first, and the maps are at the very end of the .pdf document.
