New Members Ramon74 Posted August 3 New Members Share Posted August 3 Does Anyone Has a any idea what this is? Looks like a fossil to me. Found it at a river bedding in swiss. Link to comment Share on other sites More sharing options...
Rockwood Posted August 3 Share Posted August 3 Sorry, that's a vein of quartz crystals. 2 Link to comment Share on other sites More sharing options...
Fossildude19 Posted August 3 Share Posted August 3 I'm not seeing any fossil here. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
ynot Posted August 3 Share Posted August 3 That is a quartz vein, but there are no crystals there. Crystals have a well defined geometric shape that is not present here. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted August 3 Share Posted August 3 2 hours ago, ynot said: That is a quartz vein, but there are no crystals there. Crystals have a well defined geometric shape that is not present here. Wouldn't the molecules still be in a crystalline lattice? 1 Link to comment Share on other sites More sharing options...
Coco Posted August 3 Share Posted August 3 In the form of quartz called "amorphous quartz" (translation from French), there are no crystals, it is only a formless mass of SiO2. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Pareidolia : here 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...
FranzBernhard Posted August 3 Share Posted August 3 (edited) 16 minutes ago, Coco said: In the form of quartz called "amorphous quartz" (translation from French), there are no crystals, it is only a formless mass of SiO2. Now this becomes complicated! Lets stick to mineralogy taxonomy: Euhedral crystals have crystal faces corresponding to their crystal structure. Anhedral crystals have no such faces but the same crystal structure (if it is the same mineral, of course). In other words: Crystals for a mineral collector are not the same as crystals for a mineralogist. Franz Bernhard Edited August 3 by FranzBernhard 3 Link to comment Share on other sites More sharing options...
Rockwood Posted August 3 Share Posted August 3 It seems like there would be pieces that exhibit all combinations of the two. 1 Link to comment Share on other sites More sharing options...
FranzBernhard Posted August 3 Share Posted August 3 14 minutes ago, Rockwood said: It seems like there would be pieces that exhibit all combinations of the two. These are called subhedral . Franz Bernhard 3 Link to comment Share on other sites More sharing options...
minnbuckeye Posted August 4 Share Posted August 4 My head was spinning with the mineral terminology expressed in this post. I found this figure which allows me to understand the discussion better. 3 1 Link to comment Share on other sites More sharing options...
ynot Posted August 4 Share Posted August 4 22 hours ago, Rockwood said: Wouldn't the molecules still be in a crystalline lattice? Yes, and it would be called "crystalline quartz" or "cryptocrystalline" (depending on grain size) but not "quartz crystal". And just for some clarity-- an anhedral crystal still has faces, but they are small and distorted by contact growth and blockage from other things. 3 Link to comment Share on other sites More sharing options...
Rockwood Posted August 4 Share Posted August 4 6 minutes ago, ynot said: Yes, and it would be called "crystalline quartz" or "cryptocrystalline" (depending on grain size) but not "quartz crystal". And just for some clarity-- an anhedral crystal still has faces, but they are small and distorted by contact growth and blockage from other things. I recognize the utility of these terms. On some level they make as much sense to me as a carpenter having a different word to call every length of board he uses though. Link to comment Share on other sites More sharing options...
ynot Posted August 4 Share Posted August 4 21 hours ago, FranzBernhard said: Euhedral crystals have crystal faces corresponding to their crystal structure. And a corresponding geometric shape. 1 Link to comment Share on other sites More sharing options...
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