Beryllium. The image represents beryllium.
pH is a scale or measure by which an aqueous solution could be determined of its acidity or basicity.
According to sources, the most probable answer to this query is that pH changes when for instance, an acid solution is introduced to a base solution.
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Depending on the size of the rock it comes from, yes and no. The smaller the rock, the smaller the crystals and vice versa.