How to copy the default terrain texture image?

I am trying to copy the full detailed version of the basalt terrain texture image used in roblox studio so that I can make a photoedited copy of the image with coal ore in it. This would allow the basalt with coal texture blend in and look like it is connected to the same area as the basalt texture.

When I go into the %localappdata%/Roblox/ area with windows + r and then search for basalt texture, It is only 50x50 pixels and adding coal into the texture looks like this (the black spots are the basalt texture i found + some black spots added onto the photo):

Ive tried searching online how to find this texture and I cant seem to find anything that allows you to get the full quality terrain texture image. What ive found so far is finding the 50x50 pixel image, as well as a bunch of things about creating your own textures although Im trying to just use the default basalt texture.

Thanks in advance if anyone can help me figure this out! :slight_smile:

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