A mineral of a black color, submetallic luster, and high specific specific gravity. It is a niobate (or columbate) of iron and manganese, containing…
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
Same as Columbite.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.