([Iroul] Re fish and wine -- no, I had no particular recipe in mind; it was just intended as a culinary marriage of two MCers. (The internets reveal plenty of recipes for red snapper in wine sauces, and plenty of recipes for various fish in Irouléguy sauces, but I couldn't find a specific example of my chosen combination.) I still say that by the time it was clear that the missing component from the answer was the name of an MCer that was also the name of a French alcoholic drink, you might have been expected to make a guess!)

Cdm] Found on earth? Yes (and yes, I should have tried the guess - I'm too literal about this sometimes)
Inkspot] Is it man made? Yes
Kim] Is it bigger than a telephone box? In the volume sense of bigger, no
all] Is it a telephone box? No
ImNotJohn] Is the mineral metal? Some of it is.