I have a 'thing' for labradorite: got cabs galore off JM. In various shades and locations: well the two locations I know of. Anyhoo, my first foray into it turned out to be Larvikite. (A 'black' version, as you probably know). So, Jess is saying the only labradorite in the museum they have is black. Soooo, she's professing it's labradorite, but it's probably larvikite. Why try and equate the madagascan version with a black version, when they are completely different to look at?