VS
Name
—
NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–6
Mohs hardness
—
3.04–3.17
Specific gravity
—
white
Streak
—
[Vitreous.]
Luster
—
Perfect on {110}, intersecting at 56 ± and 124±; partings on {100}, {001}
Cleavage
—
C2/m
Space group
—
Amphibole
Structural group
—
Prg · Approved
IMA
—
1815
Named in
—
Green, Brown, Black
Typical colors
—
Na · Ca · Mg · Al · Si · O · H
Elements
—