VS
Name
—
Na₂Ca₄Zr(Nb,Ti)(Si₂O₇)₂(O,F)₄
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
6–6.5
Mohs hardness
—
3.4–3.44
Specific gravity
—
Pale yellow
Streak
—
Vitreous, inclining to resinous, dull, and greasy
Luster
—
{010}, distinct; {100} and {110}, poor
Cleavage
—
P2_1
Space group
—
Wöhlerite
Structural group
—
Wöh · Grandfathered
IMA
—
1843
Named in
—
Pale yellow to yellow, brown, or gray; in transmitted light, colorless to light yellow
Typical colors
—
Na · Ca · Zr · Nb · Ti · Si · O · F
Elements
—