VS
Name
—
NaCa₂(Al₅Si₅)O₂₀·6H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
5–5.5
Mohs hardness
—
2.23–2.39
Specific gravity
—
White
Streak
—
Vitreous to pearly
Luster
—
Perfect on {010}, good on {100}
Cleavage
—
Pbmn
Space group
—
Thomsonite
Structural group
—
Thm-Ca · Approved
IMA
—
1820
Named in
—
White, Pink, Brown, Green
Typical colors
—
Na · Ca · Al · Si · O · H
Elements
—