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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(K,Na)ₓMn²⁺₆(Si,Al)₁₀O₂₄(OH)₄·nH₂O (x = 1-2; n = 7-11)
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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4–4.5
Mohs hardness
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2.77–2.84
Specific gravity
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—
Streak
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Vitreous, brilliant. Color: Light brown, pale pink
Luster
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Perfect micaceous on {001}; distinct on {100}, {010}
Cleavage
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A2/a
Space group
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Clay
Structural group
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Gnp · Grandfathered
IMA
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1890
Named in
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Light brown, pale pink
Typical colors
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K · Na · Mn · Si · Al · O · H
Elements
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