Scientists can use the color of minerals to tell them apart.
Idiochromatic minerals <em>(self-colored) </em>due to their composition. The color is constant and predictable.
Allochromatic minerals <em>(other colored) </em>due to trace impurities or defects in their structure. The color is variable and unpredictable.
Pseudochromatic minerals <em>(false colored)</em> due to effects produced by light. The color is variable but a unique property of the mineral.
<span>In 1862 and early 1863, both the Union Navy and Army tried and failed to capture Vicksburg.
Hope this was helpful!</span>
I believe the answer is: Storage
Our memory is divided in to three parts: Storage, encoding, and retrieval.
Storage is the part where we store all of the new information just after we receive them. These new information later would be encoded to determine whether it's valuable enough for us to keep. If not, these information would be eliminated from the storage.
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