Bergman (1784) Charles Hatchett (1798) and others also expressed views with regard to the constitution and origin of bitumens.
Of these early writers, Hatchett is the most explicit, the various bituminous substances being by him classified and defined.
These elements occur in the minerals columbite and tantalite, and their compounds became known in the early part of the 19th century by the labours of C. Hatchett, A.
COLUMBIUM, or Niobium (symbol Cb or Nb, atomic weight 94), one of the metallic elements of the nitrogen group, first detected in 1801 by C. Hatchett in a specimen of columbite (niobite) from Massachusetts (Phil.
- Hatchett found that the alloy of i i parts gold and i part of iron is easily rolled without annealing.
In 1801 C. Hatchett detected a new element, which he named columbium, in a mineral from Massachusetts, and in 1802 A.