VS
Name
—
NaCa₂Mg₅(Si₇Al)O₂₂(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5–6
Mohs hardness
—
3.05–3.37
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
Good on {110}, intersecting at 56± and 124±; partings on {100}, {001}
Cleavage
—
—
Space group
—
Amphibole
Structural group
—
Ed · Approved
IMA
—
1839
Named in
—
White, gray, pale green; color zoning is commonly seen in thin section
Typical colors
—
Na · Ca · Mg · Si · Al · O · H
Elements
—