The benifits of silver

In the Name of Allah, The Most Gracious, Most Merciful
The benifits of silver, and the verse that mentions it:

Some time ago, I learned that factories of beverages have a stage at which carbonated water is made to pass through pipes of silver in order to be de-germinated.
Later on, I read a translated book about minerals in which the authors, who knew nothing about Allah’s Book, the Holy Quran, or Islam, and who might not be religious at all, said, “Silver has a very special property, namely that it sends off a kind of radiation that kills the germs existing in water.” Therefore, for purposes of de-germination, either water is made to pass through silver pipes or pieces of silver are put in it.
In another part of the book, the authors said: “This mineral kills bacteria.”
In a third part they said: “As soon as water is made in touch with silver, it is purified from all the germs existing therein.”
In a fourth part of the book, the authors said: In order to de-germinate one liter of water, it is enough to put therein some parts of 1/billion gram of silver.”
In a fifth part, they said, “The color of silver does not change unless the air is impure. In other words, if the air is polluted with detrimental gases, the color of silver changes.” In this case silver can be taken as a means to measure cleanliness of the atmosphere.
In addition to the great many good properties of silver that are made use of in industry, photography, connections, … etc, and in addition to its being a metal whereby commodities are evaluated, Allah, Most Gracious, describes dwellers of Paradise in the Hereafter as,
“And amongst them will be passed round vessels of silver and cups of crystal, crystal- clear, made of silver; they will determine the measure thereof (as they like).” [LXXVI; 15,16]
The question is: Why does Allah, All-Mighty, mentions silver, but not gold, in the above Quranic Verse, whereby He, Most Gracious, describes people of Paradise, despite the fact that gold is more precious than silver and that gold is also among the things that will be existing in Paradise?!
The answer is: The above Quranic Verse includes reference to the special good properties of silver, as above mentioned, which provides clear evidence of the existence of scientific facts in Allah’s Book, the Holy Quran.
Praise be to Allah, the Lord of Creations