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VS
Grumantite
Name
—
NaSi₂O₄(OH)·H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
4–5
Mohs hardness
—
2.21
Specific gravity
—
White
Streak
—
Vitreous, silky to dull in aggregates
Luster
—
Perfect on {110}; another unspecified cleavage was observed
Cleavage
—
Fdd2
Space group
—
—
Structural group
—
Gmt · Approved
IMA
—
1985
Named in
—
White in aggregates
Typical colors
—
Na · Si · O · H
Elements
—