Stonetone® Products":26kpfmj1 said:
Here is some general data on the mineral composition of the material we use for all of the rock blocks.
By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume.
These rocks mainly consist of feldspar, quartz, mica, and amphibole minerals, which form interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende).
Copying and pasting information about granite from wikipedia and then spouting a bunch of pseduo-scientific gobledygook doesn't make you an inventor nor a scientist. Everything you've said so far is nonsense. Granite is not the fourth densest material on earth. Not even close. Granite has no significant piezoelectric properties and even if it did that would be useless for purposes of a guitar bridge. Igneous rocks, in general, are not terribly dense and are not terribly good conductors of sound. Medium to high density metals (steel, brass, etc.) are far better conductors of sound. That said we are not even sure what properties make the best bridge. Perhaps the "best" material is one that doesn't conduct the acoustic energy thereby dissipating less. Until you can show measurements that prove a theory you are nothing but a poorly veiled charlatan. Sustain is an easily measurable quantity. Hook a 'scope up to the guitar and pluck the string. Measure the time until the response is some percentage of the initial voltage. Change the bridge and repeat. Verify the results with an independent lab. Then you'll have some credibility.
I studied acoustics for 15 years prior to my current job and have several inventions to my credit in that field. Nothing you say has any scientific basis and everyone here is stupider for having listened to it.