Is this obsidian?
A public subreddit for the discussion of rock hunting and rock collecting. If you are looking for an identification for your rocks please visit /r/whatsthisrock instead.1878 CC Morgan Dollar PL GEMBU VAM 19.1 Unicorn is it worth sending in and where? Stacks and Bowers says yes and to PCGS.
/r/Silverbugs is a forum for Physical Silver stackers. Bullion and CoinsWhat kind of cartridge?
A forum for those of us interested in cartrology (the collecting and study of firearm cartridges). Posting pictures of new or interesting pieces, personal collections, and the like.Fake (allegedly) Damascus

KnifePorn is a subreddit for high-quality, high-resolution images of knives and other cutting tools, such as swords, spears, etc.