Black Stone Used in the UN Building and Harrods

This page is the CodyCross answer for the clue below from Workshop, Group 2250, Puzzle 2 (Sewing Patterns).

Question is: Black Stone Used in the UN Building and Harrods

and the answer is: LARVIKITE

Word Meaning:

LARVIKITE — A variety of monzonite with small crystals of feldspar.

Definitions from Wiktionary.