<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Jon,Here's a thought, to account for the unusual behaviors observed so far with the attempts to scoop up the highly hydrated soil....I am speaking as a chemist and not a geologist, so I don't know if my very speculative hypothesis is possible in soil chemistry, or in ice/soil mixes. But I do know what can happen in reaction flasks.What is the possibility that the ices/soils contain a buffered solution of silicic acid? Silicic acid polymerizes between pH 7-8, if I recall correctly, and especially as the water evaporates. And this was the pH measured for the soils. Polymerized silicic acid can be quite sticky to materials which have polar groups, and especially hydroxyl groups decorating their surfaces. Silicic acid polymers can thus cause soil particles in which the soil contains hydroxyl groups, or metal oxides, to adhere to each other and clump. And I suspect silicic acid polymers can adhere pretty well to metal surfaces, if those metal surfaces have a coating of oxide (since the top surface of any oxide coat in a hydrated environment contains pendant hydroxyl groups)...what is the surface of the scoop made of? Silicic acid can also polymerize to form tiny nanoparticles and colloids in water, in the right conditions. These nanoparticles then gradually clump up to form larger masses. When they substantially dry, silicic acid polymers become white friable silicate powders. <br />Posted by silylene</DIV></p><p>Sorry for the slow response, i have been uploading Woomera photos in the aviation section. Although for the lack of interst I might has well have been here!</p><p>Your suggestion is intriguing. Would these polymere still be sticky at Mars temperatures?</p><p>Jon<br /></p> <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>