Chamfer Posted October 1, 2016 Share Posted October 1, 2016 This little specimen is just 5 mm tall, and 8 mm at its widest. This comes from a chunk of matrix that I picked up in the chalk deposits in the area of Demopolis, Alabama. Having found an enchodus fish tooth in similar material, I'm making an effort to break up and look through this stuff a bit better before throwing it away. This particular tiny thing was left behind in after leaving some pieces overnight in a white vinegar bath. The chalk dissolved away, leaving this. Note the fibers scattered around it - those have come from the specimen. I'm 90% sure this is simply geologic, not fossil. Even so, I'm curious if anyone can point me to how this might have formed. Link to comment Share on other sites More sharing options...
TqB Posted October 1, 2016 Share Posted October 1, 2016 It looks like a piece of Inoceramus shell. Tarquin Link to comment Share on other sites More sharing options...
Raggedy Man Posted October 1, 2016 Share Posted October 1, 2016 Looks like gypsum to me and would explain why it didn't dissolve in the vinegar solution. Gypsum is a hydrous calcium sulfate and does not react with vinegar. 2 ...I'm back. Link to comment Share on other sites More sharing options...
Coco Posted October 1, 2016 Share Posted October 1, 2016 Hi, That also seems to me to be some gypsum. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Ludwigia Posted October 1, 2016 Share Posted October 1, 2016 +1 more for gypsum. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Chamfer Posted October 2, 2016 Author Share Posted October 2, 2016 Gypsum it is, then. Thanks everyone. Link to comment Share on other sites More sharing options...
TqB Posted October 2, 2016 Share Posted October 2, 2016 I didn't read the post properly and missed the acid bit - gypsum it is. Tarquin Link to comment Share on other sites More sharing options...
ynot Posted October 2, 2016 Share Posted October 2, 2016 This form of gypsum is often called "satin spar" and is fairly common. Tony 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now