Chestnut Hill Gneiss: CR-RS-2016
Item
- Title
- Chestnut Hill Gneiss: CR-RS-2016
- Description
-
Hand sample is banded, consistent with other Chestnut Hill specimens. Weak cleavage planes run perpendicular to foliation. The banding largely consists of alternating layers of fine to medium grained pale gray and dark gray minerals. Thicker bands of large, white crystals are irregularly spaced within the banding pattern. The bands are wavy, implying compression perpendicular to the banding pattern. Relative visible mineral abundance is as follows: Na-plagioclase (~60%), quartz (~10%), garnet (~2%), muscovite (~1%) Remaining 27% consists of dark colored minerals which are too damaged by weathering to permit identification. Garnet and muscovite crystals are too small to be readily visible to the naked eye. Sample has undergone extensive weathering and diagenesis. A significant portion of the surface is oxidized.
Based of the rocks primary composition, it seems likely that the protolith was a diorite or other igneous rock with an intermediate to felsic composition. This is a high grade metamorphic rock. - Creator
- 5052
- Mediator
- Tamara Carley
- Media
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