Yes, there were 90% silver issues sold in special collector sets. Obviously none were made for circulation because the silver alone would be worth about $2.50 to $2.75 each.
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Yes, they are made of 90% silver.
US quarter dollars issued through 1964 were 90% silver. Quarters issued from 1965 onward (except for some proof coins made for collectors) contain no silver.
To clear things up, the US never made pure silver quarters. Circulating quarters were made of 90% silver and 10% copper from 1796, the first year of issue, until 1964. In addition, modern quarters don't have any silver in them at all. They're made of a pure copper core clad with outer layers of copper-nickel alloy.
Quarters and dimes used to have silver in them, although they do not nowadays. The years that quarters had silver in them were any years before 1965.
The US didn't make any silver coins in 1979. The last circulating silver dimes and quarters were dated 1964, and the last silver halves made for circulation were dated 1969.