nenadkevichite
Sign in to saveNenadkevichite is a rare silicate mineral containing niobium with the chemical formula . It forms brown to yellow to rose colored orthorhombic dipyramidal crystals with a dull to earthy luster. It has a Mohs hardness of 5 and a specific gravity of 2.86.
Key facts
- Mineral.name
- Nenadkevichite
- Mineral.image
- Nenadkevichite-Ancylite-20236.jpg
- Mineral.caption
- Nenadkevichite with ancylite crystals on the side
- Mineral.category
- Cyclosilicate
- Mineral.strunz
- 9.CE.30a
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pbam
- Mineral.color
- Rose-pink, very light pink, light yellow, brown; dark brown due to inclusions
- Mineral.cleavage
- Poor/indistinct
- Mineral.fracture
- Irregular/uneven
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 5
- Mineral.luster
- Vitreous, dull
- Mineral.streak
- White, very light rose-pink
- Mineral.diaphaneity
- Transparent, translucent, opaque
- Mineral.gravity
- 2.78 – 2.885 g/cm3
via Wikipedia infobox
Wikidata facts
- Image
- Nenadkevichite-20230.jpg
Show 7 more facts
- IMA Mineral Symbol
- Nkv
- chemical formula
- (Na,☐)₈Nb₄(Si₄O₁₂)₂(O,OH)₄·8H₂O
- Strunz 8th edition (series ID, updated)
- VIII/B.04
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.CE.30a
- Commons category
- Nenadkevichite
- Nickel-Strunz 9th edition (updated 2009)
- 9.CE.30a
- crystal system
- orthorhombic crystal system
Sources (1)
via Wikidata · CC0
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Encyclopedic overview
1 sectionsContents
- References
Nenadkevichite is a rare silicate mineral containing niobium with the chemical formula . It forms brown to yellow to rose colored orthorhombic dipyramidal crystals with a dull to earthy luster. It has a Mohs hardness of 5 and a specific gravity of 2.86.
It was first reported in 1955 from a nepheline syenite pegmatite in the Kola Peninsula. In addition it has been reported from Mont Saint-Hilaire, Canada; the Ilimaussaq complex, Greenland; Windhoek District, Namibia; and Zheltye Vody, Ukraine. It was named after Konstantin Avtonomovich Nenadkevich (1880–1963), Russian mineralogist and geochemist.
Excerpted from Wikipedia’s “nenadkevichite” article, available under the CC BY-SA 4.0 licence.