CompuServe Messages

Edmund Scientific has some field scopes in their catalog that look pretty good. We use both a loupe and a cheaper field scope for field examinations. The monocular scope we use is illuminated and is 20x. The optics are not great but then again, at most I've lost 25 bucks if I break it. As for the pyrite deposition: anaerobic bacteria can reduce sulfur forming hydrogen sulfide (H2S) which then can react with iron to form FeS, iron sulfide. There continues to be a lot of controversy and speculation on the actual chemistry that occurs in sediments leading to concretions and pyritization. In most cases, there is a nucleus of organic material that acts as a promoter of the reactions. I have cracked open concretions only to find a single plant stem at the center, while others have bone, shells, crabs etc. There are distinct zones in concretions, although not as distinct as in agates, that are concentric with greater concentrations of iron in the center than at the edges. Since I'm presently working on three crabs for trade, I can positively state that these concretions are tough. Michael Read action !re ply Enter reply. (/EXIT when done) 1: I've got the Edmund catalog around someonewwhere, but I think I'll try 2: the newspaper classifieds first. Good 'scopes turn up at the 3: Unive3rtirsity's junk sale occasnow and then, but further investigations 4: determined that most of the used 'scopes "fall off trucks" 5: and end up in homes. My tax dollars art work, apparently. 6: 7: As for these carbs, rabs, you found them yourself, and you're cleaning 8: them up for trade? Where are you located, and where did you 9: find these? Sounds like fun. 10: /post