EOSC118 Sketching Activity 2: Pegmatites with Emerald Mineralization

Your friend has recently purchased an old emerald mine but is having difficulty identifying the best location to find emerald. This is where you, the field gemmologist, come to the rescue.

Their geologist on the ground sent you this photograph of a portion of a mine face, annotated with their geological interpretation. The host rock is composed of (potentially chromium-bearing) schists and amphibolite, which have been intruded by a set of pegmatites. The bedrock is overlain by a layer of laterite and topsoil.

Your job is to recommend where emeralds and beryl will most likely be found! This sketching tool should now be familiar to you. The information you must supply your friend with includes:

  1. Probable locations for emerald in situ (Green A)
  2. Probable locations for non-emerald beryl in situ (White B)
  3. Probable locations for secondary accumulations of beryl and emerald (Red C)
  4. Your Professional Field Gemmologist registration number (i.e., your student number in white at the top left of the image)

Follow the detailed steps below the sketching canvas to complete this activity.
Click the "crossed arrows" icon (fourth down, left side) so your mouse can move the image inside its frame.

Steps to complete this work:

  1. Use the "stroke" colour button (near the bottom left) to pick the WHITE color, then add your studnet number and name to the top left corner.
  2. Use "stroke" to pick a GREEN colour.
  3. Pick the "text" tool to place clusters of BOLD capital "A's" where emeralds are MOST likely to be found. Place as many "A's" as you like, just make sure they are in correct locations.
  4. Use WHITE to place BOLD capital "B's" where non-emerald beryl is likely to be found.
  5. Use RED to place clusters of BOLD capital "C's" where secondary accumulations of emerald and beryl might be found.
  6. Now save your work so it can be uploaded to Connect:
    1. Click "Export as PNG button.
    2. Use your browser to "Save as" or "Save Image As".
    3. PLEASE name this file using your name and student number: eg. "12345678DavidTurner.png". Do NOT change the "png" part.
  7. Finally, upload your image to the CONNECT site as instructed in the CONNECT Assignment #2.
  8. A reminder, these sketching activities are intended to be completed on your own, though discussion with peers is acceptible. Any submissions that are nearly identical will be marked 0 and a note added to your academic transcript.


Creative Commons License EOSC 118 emerald mine activity by D. Turner, F.Jones.
Licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.