| Reference Type | Journal (article/letter/editorial) |
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| Title | Eggletonite, the Na analogue of ganophyllite |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Peacor, Donald R. | Author |
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| Dunn, Pete J. | Author |
| Simmons, William B. | Author |
| Year | 1984 (March) | Volume | 48 |
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| Issue | 346 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_48/48-346-93.pdf+ |
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| DOI | doi:10.1180/minmag.1984.048.346.12Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3592 | Long-form Identifier | mindat:1:5:3592:1 |
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| GUID | 0 |
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| Full Reference | Peacor, Donald R., Dunn, Pete J., Simmons, William B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine, 48 (346) 93-96 doi:10.1180/minmag.1984.048.346.12 |
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| Plain Text | Peacor, Donald R., Dunn, Pete J., Simmons, William B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine, 48 (346) 93-96 doi:10.1180/minmag.1984.048.346.12 |
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| In | (1984, March) Mineralogical Magazine Vol. 48 (346) Mineralogical Society |
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| Abstract/Notes | AbstractEggletonite is a new mineral, the Na analogue of ganophyllite. Type material has composition(Na0.82K0.40Ca0.39□0.39)Σ2.00 (Mn6.61Zn0.08Mg0.16Fe0.61Al0.56)Σ8.02 (Si10.33Al1.67)Σ12.00[(O28.92(OH)3.08]Σ32.00 (OH)4.00·10.66H2O.It occurs as prismatic crystals elongated along [100] in miarolitic cavities in nepheline syenite at the Big Rock Quarry, Little Rock, Arkansas. Single-crystal X-ray diffraction data are consistent with space group I2/a or Ia; a = 5.554, b = 13.72, c = 25.00Å, β = 93.95° Z = 2; this is equivalent to the substructure of ganophyllite. Physical properties include cleavage: {001} perfect; colour: dark brown; translucent; streak: light brown; hardness (Mohs): 3–4; brittle; observed density 2.76, calculated density 2.76 g/cm3. Optically, eggletonite is biaxial negative, with optical parameters 2Vα = 9(3)° r < ν, weak; indices of refraction α = 1.566(2), β = 1.606(2), γ = 1.606(2); pleochroism is very weak, γ ≃ β > α; α = pale brown to colourless, β ≃ γ = pale yellow brown. Principal lines in the X-ray powder diffraction pattern are (d, I/Io): 12.4, 100; 3.45, 15; 3.13, 30; 2.854, 15; 2.691, 25; 2.600, 20; 2.462, 20; 2.387, 15. The name is in honour of Dr Richard A. Eggleton, Australian National University. |
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