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Galena is a mineral. not a rock, but is commonly found emplaced in sedimentary rock from hydrothermal deposition in faults and fissures.
No, the cat 5 wire should cross conduits at an angle of 90 degrees. If the cat 5 wire is installed in conduit then it can be run parallel with the other conduits. Yes they can be installed above the dropped ceilings but tie them up high near the joists.
Vein minerals can contain deposits of metals and other minerals, and occur in fissures or cracks of rock.
Vein minerals are those that form in fissures in the existing rock, either thru deposition by mineral saturated hydrothermal fluids, or injection of magma and subsequent cooling.
Lead is found in a number of minerals, such as galena, vanadinite, and wulfenite. Most lead ore is present in rock veins that were created by deposition from mineral rich hot water that circulated in cracks and fissures in existing rock, and may contain additional valuable minerals as well.