Caryopilite
Phyllosilicate mineral / From Wikipedia, the free encyclopedia
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Caryopilite (synonymous with ectropite and ektropite)[5] is a brown-colored mineral with formula (Mn2+,Mg)3Si2O5(OH)4. The mineral was discovered in 1889 from a mine in Sweden. It was named for the Greek words for walnut and felt in reference to its appearance.
Quick Facts General, Category ...
Caryopilite | |
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General | |
Category | Phyllosilicate minerals |
Formula (repeating unit) | (Mn2+,Mg)3Si2O5(OH)4[1] |
IMA symbol | Cpl[2] |
Strunz classification | 9.ED.15 |
Dana classification | 71.1.2b.1 |
Crystal system | Monoclinic |
Crystal class | Domatic (m) (same H-M symbol) |
Space group | Cm |
Unit cell | a = 5.66 Å, b = 9.81 Å, c = 7.52 Å, β = 104.52°; Z = 2[1] |
Identification | |
Formula mass | 3 to 3.5 |
Color | Reddish brown, tan Light brown to yellow in thin section[1] |
Cleavage | Perfect on {001}[1] |
Luster | Vitreous[3] |
Streak | Light Brown[3] |
Diaphaneity | Semitransparent[1] |
Density | 2.83–2.94 (measured)[1] |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.606 to 1.620 nβ = 1.632 to 1.650 nγ = 1.632 to 1.650 |
Birefringence | δ = 0.026 to 0.030 |
2V angle | ~0°[1] |
Dispersion | Weak |
References | [4][5] |
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