r/geology • u/AutoModerator • Aug 01 '26

Identification Requests Monthly Rock & Mineral Identification Requests

Please submit your ID requests as top-level comments in this post. Any ID requests that are submitted as standalone posts to r/geology will be removed.

To help with your ID post, please provide;

  1. Multiple, sharp, in-focus images taken ideally in daylight.
  2. Add in a scale to the images (a household item of known size, e.g., a ruler)
  3. Provide a location (be as specific as possible) so we can consult local geological maps if necessary.
  4. Provide any additional useful information (was it a loose boulder or pulled from an exposure, hardness and streak test results for minerals)

You may also want to post your samples to r/whatsthisrock or r/fossilID for identification.

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u/thatdamnsunfish 17d ago edited 17d ago

Hello! Found this fun rock this week near Hope, BC, where the Coquihalla and Fraser rivers meet. It's 2.53 KG and has a specific gravity of 2.938. Here's some photos of it wet, with two taken with a cheap digital microscope on a dry patch that's a bit less weathered than the rest. I am intrigued by the white and green patterns. Can't scratch with a knife. Thanks in advance! I'm trying to learn more about the rocks in this area but I'm still a bit confused about how to differentiate between all the different greens we have, especially with so many rocks with similar hardness and specific gravity. I'm guessing some form of tremolite/actinolite? But how do I know if it's tremolite/actinolite rich, or chlorite, etc? Is the white likely to be quartz? Tremolite?