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VS
Hellandite-(Ce)
Name
—
(Ca,REE)₄Ce₂Al   ₂(B₄Si₄O₂₂)(OH)₂
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
—
Mohs hardness
—
—
Specific gravity
—
—
Streak
—
[Vitreous to dull.]
Luster
—
[Poor on {100}, {010}.]
Cleavage
—
P2/a
Space group
—
Hellandite
Structural group
—
Hld-Ce · Approved
IMA
—
1999
Named in
—
Light green
Typical colors
—
Ca · REE · Ce · Al · B · Si · O · H
Elements
—