VS
Name
—
(Na, )₈Nb₄(Si₄O₁₂)₂(O,OH)₄·8H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5
Mohs hardness
—
2.78–2.88
Specific gravity
—
White to very pale rose
Streak
—
Vitreous to dull
Luster
—
Poor on {001}
Cleavage
—
Cm
Space group
—
Labuntsovite
Structural group
—
Nkv · Grandfathered
IMA
—
1955
Named in
—
Rose, very pale pink, pale yellow, brown; dark brown due to manganese oxides
Typical colors
—
Na · Nb · Si · O · H
Elements
—