columbite
Sign in to saveAlso known as Yttrocolumbite, columbite-(metal) series, columbite series, columbate, niobite, niobite-tantalite
Columbite, also called niobite, niobite-tantalite and columbate, with a general chemical formula of , is a black mineral group that is an ore of niobium. It has a submetallic luster, a high density, and is a niobate of iron and manganese. Niobite has many applications in aerospace, construction and the medical industry. Dating columbite minerals is primarily completed by uranium–lead dating, a slow process.
Key facts
- Mineral.name
- Columbite
- Mineral.category
- Oxide minerals
- Mineral.image
- Columbite-75444.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- {{chem2|(Fe^{II},Mn^{II})Nb2O6}}, or in oxide formula {{chem2|(Fe^{II},Mn^{II})O*Nb2O5}}
- Mineral.IMAsymbol
- Clb
- Mineral.strunz
- 4.DB.35
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pbcn
- Mineral.color
- Black, brownish black.
- Mineral.habit
- Massive – granular – common texture observed in granite and other igneous rock; Striated - parallel lines on crystal surface or cleavage face.
- Mineral.cleavage
- [010] Distinct
- Mineral.fracture
- Sub-conchoidal: fractures developed in brittle materials characterized by semi-curving surfaces.
- Mineral.mohs
- 6
- Mineral.luster
- Sub-metallic
- Mineral.opticalprop
- Biaxial (+), b = 2.29–2.4
- Mineral.streak
- Blackish brown
via Wikipedia infobox
Wikidata facts
- Image
- Columbite-75444.jpg
Show 2 more facts
- Commons category
- Columbite
- Mohs' hardness
- 6
via Wikidata · CC0
~11 min read
Article
12 sectionsContents
- History and etymology
- Columbite species
- Structure
- Applications
- Formation
- Environmental impact
- Dating
- Artisanal and small-scale mining
- Further reading
- See also
- References
- External links
{{Infobox mineral | name = Columbite | category = Oxide minerals | boxwidth = | boxbgcolor = | image = Columbite-75444.jpg | imagesize = 260px | caption = | formula = {{chem2|(Fe^{II},Mn^{II})Nb2O6}}, or in oxide formula {{chem2|(Fe^{II},Mn^{II})O*Nb2O5}} | IMAsymbol=Clb | molweight = | strunz = 4.DB.35 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pbcn | color = Black, brownish black. | habit = Massive – granular – common texture observed in granite and other igneous rock; Striated - parallel lines on crystal surface or cleavage face. | cleavage = [010] Distinct | fracture = Sub-conchoidal: fractures developed in brittle materials characterized by semi-curving surfaces. | mohs = 6 | luster = Sub-metallic | refractive = | opticalprop = Biaxial (+), b = 2.29–2.4 | birefringence = | pleochroism = | streak = Blackish brown | gravity = 5.3–7.3 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = 25px Radioactive, non-fluorescent. | references =
}} Columbite, also called niobite, niobite-tantalite and columbate, with a general chemical formula of {{chem2|(Fe^{II},Mn^{II})Nb2O6|auto=yes}}, is a black mineral group that is an ore of niobium. It has a submetallic luster, a high density, and is a niobate of iron and manganese. Niobite has many applications in aerospace, construction and the medical industry. Dating columbite minerals is primarily completed by uranium–lead dating, a slow process.