VS
Name
—
Ca₂Al(Si₃Al)O₁₀(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
6–6.5
Mohs hardness
—
2.8–2.95
Specific gravity
—
White
Streak
—
Vitreous, weak pearly on {001}
Luster
—
Good on {001}, poor on {110}
Cleavage
—
Pncm
Space group
—
Prehnite
Structural group
—
Prh · Grandfathered
IMA
—
1789
Named in
—
Light to dark green, white, yellow, gray, pink; colorless in thin section
Typical colors
—
Ca · Al · Si · O · H
Elements
—