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On Jul 11, 12:43 pm, Robert Clark <rgregorycl...@yahoo.com> wrote: Mars Global Surveyor identified two primary surface types on Mars, Type 1 and Type 2. Type 1 material was identified as due to basaltic lava. However, the origin of Type 2 material has been a mystery. Type 1 rocks can be converted into Type 2. In highly acidic water , such as exists in fumaroles and volcanic lakes

Mars Global Surveyor identified two primary surface types on Mars, Type 1 and Type 2. Type 1 material was identified as due to basaltic lava. However, the origin of Type 2 material has been a mystery. Proposed explanations include andesitic lava, or aqueously altered basaltic lava. A report to the 7th International Conference on Mars may provide a means of resolving this mystery: NEW CLUES