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Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
Royal Ontario Museum
Specimen #44837
Photo by Violet Anderson
© Royal Ontario Museum

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
Royal Ontario Museum
Specimen #44837
Photo by Violet Anderson
© Royal Ontario Museum

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Gilles Haineault

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Doug Merson

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Doug Merson

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
Photo by R. Lavinsky
© www.irocks.com


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Home > Mineral Descriptions > Nenadkevichite - (19 Photos)



Nenadkevichite
(Na,Ca,K)(Nb,Ti)Si2O6(O,OH) · 2H2O

     Several nice nenadkevichite crystals have been found at Mont Saint-Hilaire, it is also found as pseudomorphs after sérandite. The labuntsovite-nenadkevichite series is expanding rapidly, there are probably several members present at mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color ranges from colorless to pale pink, pale yellow, rose-pink,
   orange and brownish red.
Luster is vitreous to pearly or dull; some crystals are coated by
   a thin iridescent film.
Diaphaneity is transparent to translucent for the crystals and
   opaque for the aggregates.
Crystal System is orthorhombic; Pbam.
Crystal Habits include masses to several cm across of intergrown
   small crystals. Superb 1-8mm prismatic and very thin tabular single
   crystals as stacked clusters of compact spherical aggregates.
Cleavage {010} is poor.
Fracture is uneven.
Hardness is 5
Specific Gravity is approximately 2.7 to 2.8g/cm3
Streak is white.
Associated Minerals include aegirine, albite, amphibole group,
   analcime, ancylite, astrophyllite, bastnäsite, calcite, catapleiite,
   chlorite group, donnayite, elpidite, epididymite, eudialyte, fluorapatite,
   fluorite, hilairite, mangan-neptunite, microcline, monteregianite,
   natrolite, polylithionite, pyrite, pyrochlore, rhodochrosite, rutile,
   sérandite, sphalerite, steacyite and yofortierite.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1955 after Konstantin Antonomovich Nenadkevich
   (1880-1963), geochemist and mineralogist, Institute of Mineralogy
   and Geochemistry of Rare Elements, Moscow, Russia.

CLASSIFICATION:

Dana System
# 60.1.3.1

Strunz Classification
# VIII/E.07-140

REFERENCES:
MinRec 21:326 (1990), AmMin 40:1154 (1955), Dana 8:1234 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
¤¤

MX
¤¤

SS
--

MC
--

HF
--

BR
¤¤

SX
--

FR
--

Legend

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Modris Baum

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Jason B. Smith

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Doug Merson

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Stephan Wolfsried

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Stephan Wolfsried

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Stephan Wolfsried

Nenadkevichite scepters - click for larger pic
Nenadkevichite scepters
© Steven Stuart

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Jason B. Smith

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Doug Merson

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Stephan Wolfsried

Nenadkevichite scepters - click for larger pic
Nenadkevichite scepters
© Steven Stuart

Nenadkevichite crystals - click for larger pic
Nenadkevichite crystals
© Doug Merson