This Quartz crystal was bought from a collector who was told it had been cut for some electrical equipment, I lresearched what the posible application was for such a big crystal but cam to the conclusion that it is a man made synthetic quartz crystal in its raw form. Close inspection shows the mounting metal fasteners on the ends of the seed quartz. The shape is not in the same axis as a naturally formed crystal - the seed is cut on one of the minor axis', i.e it is grown on its side.
Here is a small natural crystal, and a diagram showing quartz planes and surfaces in the crystals.
Here is a link to a commercial synthetic quartz crystal growers web site https://www.ndk.com/en/products/crystal/glossary/
A document describing the manufacturing process: https://www.ndk.com/catalog/AN-SQC_GG_e.pdf