[Mesorah] All that glitters may not be...

[Richard Wolpoe via Mesorah]

"While on the topic, I proposed on Avodah that barzel originally meant "metal", and only came to mean iron and its alloys and the bronze age shifted into the iron age. Which would mean that the chumash is telling
us that no metal can be used to make a mizbe'ach, not even bronze."

RMB


How do you "teitch"
Barzel unchoshes  Min'olecha...

They seem to be 2 independent items not a set and a subset‎.

Of course sometimes a term can apply both to a set or to a subset.