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Eggletonite

A valid IMA mineral species

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Photos of Eggletonite (18)

Eggletonite Gallery Search Photos of Eggletonite

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Eggletonite

Shiromaru mine, Okutama-cho, Nishitama district, Tokyo Metropolis, Japan

Eggletonite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

Eggletonite

Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

Eggletonite

Shiromaru mine, Okutama-cho, Nishitama district, Tokyo Metropolis, Japan

Eggletonite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

Eggletonite

Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

Eggletonite

Shiromaru mine, Okutama-cho, Nishitama district, Tokyo Metropolis, Japan

Eggletonite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

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About EggletoniteHide

R. Anthony Eggleton

Formula:

(Na,K,Ca)₂(Mn,Fe)₈(Si,Al)₁₂O₂₉(OH)₇ · 11H₂O

Colour:

Dark to golden brown, red-brown

Lustre:

Vitreous

Hardness:

3 - 4

Specific Gravity:

2.76

Crystal System:

Monoclinic

Member of:

Ganophyllite Group

Name:

Named by D. Peacor, P.J. Dunn, and W.B. Simmons in 1984 in honor of Dr. Richard Anthony Eggleton, mineralogist at the Australian National University and an expert on the crystal chemistry of the stilpnomelane group of minerals. It was first found in the Big Rock Quarry by Mr. Cecil Cosse in 1975 and submitted to the Smithsonian Institution for examination in 1977.

Type Locality:

ⓘ Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

Ganophyllite Group. The sodium analogue of Ganophyllite.

Not to be confused with the unrelated mercury mineral Eglestonite.

Unique IdentifiersHide

Mindat ID:

1356

Long-form identifier:

mindat:1:1:1356:3

GUID
(UUID V4):

a84de561-66e4-4c94-b756-09c42d91e9c9

IMA Classification of EggletoniteHide

IMA status:

Approved

IMA Formula:

(Na,K,Ca)_xMn₆(Si,Al)₁₀O₂₄(OH)₄ · nH₂O (x = 1-2; n = 7-11)

First published:

1984

Type description reference:

Peacor, D., Dunn, P.J., Simmons, W.B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine: 48: 93-96.

Classification of EggletoniteHide

Strunz-mindat (2024):

9.EG.30

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings

Dana 7th ed.:

74.1.2.2

Dana 8th ed.:

74.1.2.2

74 : PHYLLOSILICATES Modulated Layers
1 : Modulated Layers with joined islands

Hey's CIM Ref.:

16.16.14

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference
Egg	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Egg	Warr (2020)	Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of EggletoniteHide

Lustre:

Vitreous

Transparency:

Translucent

Colour:

Dark to golden brown, red-brown

Streak:

Light Brown

Hardness:

3 - 4 on Mohs scale

Tenacity:

Very brittle

Cleavage:

Perfect
[001] Perfect

Density:

2.76 g/cm³ (Measured) 2.76 g/cm³ (Calculated)

Optical Data of EggletoniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.566 n_β = 1.606 n_γ = 1.606

2V:

Measured: 9°

Max Birefringence:

δ = 0.040

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Moderate

Dispersion:

r > v strong

Pleochroism:

Weak

Comments:

X = pale brown to colorless; Y = Z = pale yellow-brown.

Chemistry of EggletoniteHide

Mindat Formula:

(Na,K,Ca)₂(Mn,Fe)₈(Si,Al)₁₂O₂₉(OH)₇ · 11H₂O

Elements listed:

Al, Ca, Fe, H, K, Mn, Na, O, Si - search for minerals with similar chemistry

Common Impurities:

Zn,Mg

Crystallography of EggletoniteHide

Crystal System:

Monoclinic

Cell Parameters:

a = 5.55 Å, b = 13.72 Å, c = 25.00 Å
β = 93.95°

Ratio:

a:b:c = 0.405 : 1 : 1.822

Unit Cell V:

1,899.13 Å³ (Calculated from Unit Cell)

Twinning:

On {001}.

Comment:

Point Group: 2/m or m:; : Space Group: I2/a or Ia:

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
12.4 Å	(100)
3.13 Å	(30)
2.691 Å	(25)
2.600 Å	(20)
2.462 Å	(20)
3.45 Å	(15)
2.854 Å	(15)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of EggletoniteHide

Type Locality:

ⓘ Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA

General Appearance of Type Material:

clusters of divergent sprays of radiating acicular prisms, to 2 cm

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 137143.

Associated Minerals at Type Locality:

Reference:

Peacor, D., Dunn, P.J., Simmons, W.B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine: 48: 93-96.

Download:

http://rruff.info/rruff_1.0/uploads/MM48_93.pdf

Synonyms of EggletoniteHide

IMA1982-059

Other Language Names for EggletoniteHide

German:Eggletonit

Spanish:Eggletonita

Relationship of Eggletonite to other SpeciesHide

Member of:

Ganophyllite Group

Other Members of this group:

Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O	Mon. 2/m
Tamaite	(Ca,K,Ba,Na)_3-4Mn₂₄(Si,Al)₄₀(O,OH)₁₁₂ · 21H₂O	Mon. 2/m : P2₁/b

Common AssociatesHide

Associated Minerals Based on Photo Data:

7 photos of Eggletonite associated with Aegirine	NaFe³⁺Si₂O₆
2 photos of Eggletonite associated with Albite	Na(AlSi₃O₈)
2 photos of Eggletonite associated with Orthoclase	K(AlSi₃O₈)
2 photos of Eggletonite associated with Barwoodite	Mn²⁺₆Nb⁵⁺(SiO₄)₂O₃(OH)₃
1 photo of Eggletonite associated with Pyrophanite	Mn²⁺TiO₃
1 photo of Eggletonite associated with Analcime	Na(AlSi₂O₆) · H₂O
1 photo of Eggletonite associated with Zircon	Zr(SiO₄)
1 photo of Eggletonite associated with Tamaite	(Ca,K,Ba,Na)_3-4Mn₂₄(Si,Al)₄₀(O,OH)₁₁₂ · 21H₂O
1 photo of Eggletonite associated with Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O
1 photo of Eggletonite associated with Quartz	SiO₂

Related Minerals - Strunz-mindat Grouping Hide

9.EG.05	Cymrite	BaAl₂Si₂(O,OH)₈ · H₂O	Mon. 2 : P2₁
9.EG.10	Naujakasite	(Na,K)₆(Fe²⁺,Mn²⁺,Ca)(Al,Fe)₄Si₈O₂₆	Mon.
9.EG.10	Manganonaujakasite	Na₆(Mn²⁺,Fe²⁺)Al₄Si₈O₂₆	Mon. 2/m : B2/m
9.EG.15	Dmisteinbergite	Ca(Al₂Si₂O₈)	Trig. 3 2 : P3 1 2
9.EG.20	Kampfite	Ba₁₂(Si₁₁Al₅)O₃₁(CO₃)₈Cl₅	Mon. m
9.EG.25	Strätlingite	Ca₂Al₂SiO₇ · 8H₂O	Trig. 3m : R3m
9.EG.25	Vertumnite	Ca₄Al₄Si₄O₆(OH)₂₄ · 3H₂O	Mon. 2/m : P2₁/m
9.EG.30	Ganophyllite	(K,Na,Ca)₂Mn₈(Si,Al)₁₂(O,OH)₃₂ · 8H₂O	Mon. 2/m
9.EG.30	Tamaite	(Ca,K,Ba,Na)_3-4Mn₂₄(Si,Al)₄₀(O,OH)₁₁₂ · 21H₂O	Mon. 2/m : P2₁/b
9.EG.35	Coombsite	KMn²⁺₁₃(Si,Al)₁₈O₄₂(OH)₁₄	Trig.
9.EG.35	Zussmanite	K(Fe,Mg,Mn)₁₃(Si,Al)₁₈O₄₂(OH)₁₄	Trig. 3 : R3
9.EG.40	Franklinphilite	(K,Na)₄(Mn²⁺,Mg,Zn)₄₈(Si,Al)₇₂(O,OH)₂₁₆ · 6H₂O	Tric.
9.EG.40	Lennilenapeite	K_6-7(Mg,Mn,Fe,Zn)₄₈(Si,Al)₇₂(O,OH)₂₁₆ · 16H₂O	Tric.
9.EG.40	Parsettensite	(K,Na,Ca)_7.5(Mn,Mg)₄₉Si₇₂O₁₆₈(OH)₅₀ · nH₂O	Mon. 2/m : B2/m
9.EG.40	Stilpnomelane	(K,Ca,Na)(Fe,Mg,Al)₈(Si,Al)₁₂(O,OH)₃₆ · nH₂O	Tric. 1 : P1
9.EG.40	Chalcodite	K(Fe³⁺,Mg,Fe²⁺)₈(Si,Al)₁₂(O,OH)₂₇	Tric. 1 : P1
9.EG.45	Latiumite	(Ca,K)₄(Si,Al)₅O₁₁(SO₄,CO₃)	Mon. 2 : P2₁
9.EG.45	Tuscanite	KCa₆(Si,Al)₁₀O₂₂(SO₄,CO₃)₂(OH) · H₂O	Mon. 2/m : P2₁/b
9.EG.45	Levantite	KCa₃Al₂(SiO₄)(Si₂O₇)(PO₄)	Mon. 2 : P2₁
9.EG.50	Jagoite	Pb₁₈Fe³⁺₄[Si₄(Si,Fe³⁺)₆][Pb₄Si₁₆(Si,Fe)₄]O₈₂Cl₆	Hex. 6 m2 : P6c2
9.EG.55	Wickenburgite	CaPb₃Al₂Si₁₀O₂₄(OH)₆	Trig. 3m : P3 1c
9.EG.60	Hyttsjöite	Pb₁₈Ba₂Ca₅Mn²⁺₂Fe³⁺₂Si₃₀O₉₀Cl · 6H₂O	Trig. 3 : R3
9.EG.65	Armbrusterite	K₅Na₇Mn₁₅[(Si₉O₂₂)₄](OH)₁₀ · 4H₂O	Mon. 2/m : B2/m
9.EG.70	Britvinite	[Pb₇(OH)₃F(BO₃)₂(CO₃)][Mg_4.5(OH)₃(Si₅O₁₄)]	Tric. 1 : P1
9.EG.70	Roymillerite	Pb₂₄Mg₉(Si₁₀O₂₈)(CO₃)₁₀(BO₃)(SiO₄)(OH)₁₃O₅	Tric. 1 : P1
9.EG.75	Bannisterite	(Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ · nH₂O	Mon. 2/m : B2/b
9.EG.75	UM1989-30-SiO:AlBaCaFeHKMgMn	(Ba,Ca)(Mn,Fe,Mg)₂₂(Si,Al)₃₂O₇₆(OH)₁₆ · 12H₂O
9.EG.75	Kayupovaite	Na₂Mn₁₀[(Si₁₄Al₂)O₃₈(OH)₈] · ₇H₂O	Mon. 2/m : B2/b

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for EggletoniteHide

mindat.org URL:

https://www.mindat.org/min-1356.html
Please feel free to link to this page.

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External Links:

Look for Eggletonite on Webmineral

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for EggletoniteHide

Reference List:

Peacor, D., Dunn, P.J., Simmons, W.B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine: 48: 93-96.

Dunn, Pete J., Gobel, Volker, Grice, Joel D., Puziewicz, Jacek, Shigley, James E., Vanko, David A., Zilczer, Janet (1985) New mineral names. American Mineralogist, 70 (3-4) 436-441

Guggenheim, S. & Eggleton, R.A. (1986): Cation exchange in ganophyllite. Mineralogical Magazine 50, 517-520.

Hughes, J.M., Rakovan, J., Bracco, R., Gunter, M.E. (2003) The atomic arrangement of the ganophyllite-group modulated layer silicates as determined from the orthorhombic dimorph of tamaite, with the elusive 16.8 Å ganophyllite-group superstructure revealed. American Mineralogist: 88: 1324-1330.

(2023) Eggletonite. Handbook of Mineralogy. Mineralogical Society of America

Localities for EggletoniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Italy
Liguria Genoa Ne ⓘ Molinello Mine	Bracco (2012)
Piedmont Cuneo Province Bellino ⓘ Maniglia Mt. Mine	Piccoli et al. (2021)
Montaldo di Mondovì Borgata Oberti ⓘ Montaldo Mine (Montaldo di Mondovì Mine)	Matteo Giai et al. (2023)

Japan
Tokyo Metropolis Nishitama district Okutama-cho ⓘ Shiromaru mine (Hakumaru mine)	Matsubara et al. (2000) +2 other references

USA
Arkansas Pulaski County Little Rock ⓘ Granite Mountain area	Rocks and Minerals (1988) +1 other reference
ⓘ Big Rock Quarry (3M Quarry; Arch Street Pike Quarry) (TL)	Peacor et al. (1984) +1 other reference

Eggletonite

About EggletoniteHide

Unique IdentifiersHide

IMA Classification of EggletoniteHide

Classification of EggletoniteHide

Mineral SymbolsHide

Physical Properties of EggletoniteHide

Optical Data of EggletoniteHide

Chemistry of EggletoniteHide

Crystallography of EggletoniteHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of EggletoniteHide

Synonyms of EggletoniteHide

Other Language Names for EggletoniteHide

Relationship of Eggletonite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for EggletoniteHide

References for EggletoniteHide

Localities for EggletoniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide