Compare Minerals
Put any two minerals side by side — formula, structure, hardness, density and more. Type to search each slot.
Name
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Ca₂(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂
Formula
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Mineral Species
Entry type
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Silicates
Chemical class
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Monoclinic
Crystal system
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5–6
Mohs hardness
—
3.32–3.35
Specific gravity
—
—
Streak
—
[Vitreous.]
Luster
—
[Perfect on {110}, with intersections at ~56° and ~124°; partings on {100}, {001}.]
Cleavage
—
C2/m
Space group
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Amphibole
Structural group
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Fts · Approved
IMA
—
2016
Named in
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Green; green to tan in thin section
Typical colors
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Ca · Fe · Al · Si · O · H
Elements
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