A friend who had been looking around a church roof (heavy on the lead) tried to impress me by telling me that the leadwork was signed by Joe Bloggs, Plumber - as if I wouldn’t know why the work had been done by a plumber. 
As in golf club or household appliance? I don’t have a magnet handy to test it, but I think my iron (appliance) is mostly iron.
Anyawy, here’s another: modern “silvered” mirrors are usually coated with aluminum, not silver.
Speaking of which, I have a 'puter made out of mostly silicon and plastic.
Platinite is an alloy of 46% nickel and 54% iron. So why is it called platinite? It seems that in the early days of electric bulbs there was a problem in getting wires through glass since glass had a coefficient of thermal expansion that didn’t match that of any conductor–except platinum. The result was that bulbs were very expensive to buy, but you could trade your burned out bulbs for new ones quite cheaply. My father (born in 1906) remembered that and so did one of my elementary school teachers who told the story. Eventually, a glass and an alloy were found that had the same thermal expansion. The alloy was called platinite and, for all I know, is still used today.
The planet Mercury is actually mostly iron.
LEDs are, in fact, mostly made of glass and a gallium compound.
Quicksilver is actually mercury, and has no silver in it at all.
Outside the scope of the OP, but all the linens I’ve ever used have been made from cotton. I’ve always wondered why.
The Malaysian state of Perak was named for its tin production. However, in Malay perak means ‘silver’.
What about pencil “lead”? Not even metal!
More likely, your iron is stainless steel, unless it’s old and rusty!
That ain’t glass it’s plastic.
Steel is ~98% iron, isn’t it?
Not always, and I’d never call bronze or brass, copper even though they’re alloys of with high copper content.
Pig iron; 4% – 5% carbon and contains varying amounts of contaminants such as sulfur, silicon and phosphorus.
Cast iron; 2% – 4.0% carbon , 1% – 6% silicon , and small amounts of manganese.Technically it’s cementite, or iron carbide.
Wrought iron; less than 0.2% carbon.
Steel;
Mild steel 0.10% to 0.25% carbon
Medium carbon steel 0.25% to 0.45% carbon
High carbon steel 0.45% to 0.95% carbon
Very high carbon steel 0.95% to 2.1% carbon
Stainless steel; minimum of 10.5% chromium, often combined with nickel
And you also have all the “ites”;
austenite, bainite, martensite, cementite, ferrite, pearlite,
these form at different times during the heat treating process.
I’ve been a knife maker for ten years, and some of my friends (mostly the blacksmiths) would ream me a new one if I called 10 series steel, iron, even though it is mostly iron!