Columbite definitions

Columbite

1) Iron mineral 2) Mineral 3) Niobite 4) Oxide mineral
Found on https://www.crosswordclues.com/clue/columbite

---

Columbite

1) Niobite
Found on https://www.crosswordclues.com/clue/columbite

---

Columbite

Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese. This mineral group was first found in Haddam, Connecticut, in the United States. It forms a series with the tantalum-dominant ana...
Found on http://en.wikipedia.org/wiki/Columbite

---

Columbite

• (n.) A mineral of a black color, submetallic luster, and high specific specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron; -- first found in New England.
Found on http://thinkexist.com/dictionary/meaning/columbite/

---

columbite

hard, black (often iridescent), heavy oxide mineral of iron, manganese, and niobium [(Fe,Mn)Nb2O6]. Tantalum atoms replace niobium atoms in the ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/c/113

---

Columbite

Co·lum'bite noun [ Confer French colombite . See Columbium .] (Min.) A mineral of a black color, submetallic luster, and high specific specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron; -- first found in New England.
Found on http://www.encyclo.co.uk/webster/C/113

---

Columbite

Columbite is a mineral of a black colour, sub-metallic lustre, and high specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron, was first found in New England and is the main ore of niobium and tantalum. It shows a bluish iridescent fracture surface and is used in metallurgy to create heat-resistant all...
Found on http://www.probertencyclopaedia.com/browse/HC.HTM

---

columbite

a black, crystalline mineral, iron niobate, (Fe, Mn)NbO, the principal ore of niobium, an end member of a series of solid solutions in which manganese and tantalum combine to form tantalite.
Found on https://www.infoplease.com/dictionary/columbite

---