Charlie, I don't want to derail this Ramah Chert thread, but your green triangle may possibly be a material that I have just learned of. It might be Pelham Chert, which seems to have been found here in North Central Mass. I saw a few points in an old donated collection from this area and they were described as Pelham Chert. I've found a few pieces and some chips of what I believe are this material. An online search of the material only turned up these two links.
https://www.britannica.com/science/chert Note the first picture at the top of the page.
https://www.britannica.com/science/chert Note the first picture at the top of the page.
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