VS
Name
—
NaNa₂(Mg₄Al)Si₈O₂₂(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–6
Mohs hardness
—
3.02
Specific gravity
—
—
Streak
—
[Vitreous.]
Luster
—
Perfect on {110}, intersecting at 56° and 124°; [parting on {010}]
Cleavage
—
C2/m
Space group
—
Amphibole
Structural group
—
Eck · Approved
IMA
—
2015
Named in
—
Colorless to gray
Typical colors
—
Na · Mg · Al · Si · O · H
Elements
—