Eakerite (original) (raw)

A valid IMA mineral species

About EakeriteHide

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Formula:

Ca2SnAl2Si6O18(OH)2 · 2H2O

Crystal System:

Monoclinic

Name:

Named in honor of Jack Eaker (26 October 1930, York County, South Carolina, USA - 28 February 2021, Kings Mountain, Cleveland co, NC, USA), lab analyst for the Foote Mineral Company at Kings Mountain, North Carolina, USA. He discovered the mineral and suspected it was a new species. The name is pronounced ēkerait.

This page provides mineralogical data about Eakerite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1343:3

ce10bfc6-abcc-47cd-bd7e-b30450068dac

IMA Classification of EakeriteHide

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IMA Formula:

Ca2Sn4+Al2Si6O18(OH)2 · 2H2O

Type description reference:

Classification of EakeriteHide

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9.CG.05

9 : SILICATES (Germanates)
C : Cyclosilicates
G : [Si4O12]8- branched 4-membered single rings

72.1.5.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings

16.14.12

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb

Mineral SymbolsHide

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

Physical Properties of EakeriteHide

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Transparency:

Transparent, Translucent

Density:

2.93(1) g/cm3 (Measured) 2.931 g/cm3 (Calculated)

Comment:

Measured flawless crystals by immersion in Clerici solution

Optical Data of EakeriteHide

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RI values:

_n_α = 1.584 _n_β = 1.586 _n_γ = 1.600

2V:

Measured: 35° , Calculated: 42°

δ = 0.016

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

Chemistry of EakeriteHide

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Mindat Formula:

Ca2SnAl2Si6O18(OH)2 · 2H2O

Crystallography of EakeriteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 15.83 Å, b = 7.72 Å, c = 7.44 Å
β = 101.31°

Ratio:

a:b:c = 2.051 : 1 : 0.964

Unit Cell V:

891.57 ų (Calculated from Unit Cell)

Morphology:

Prismatic crystals. Forms, in order of abundance (type material) are: {111}, {210}, {410}, {201}, {20l}, {001}, and {100.}

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of EakeriteHide

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General Appearance of Type Material:

Transparent prismatic crystals

Place of Conservation of Type Material:

Natural History Museum, London, England, 1968, 204.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 120301, 121143.

Geological Setting of Type Material:

Spodumene-rich pegmatite.

Associated Minerals at Type Locality:

Reference:

Leavens, P.B., White, J.S., Hey, M.H. (1970) Eakerite, a new tin silicate. The Mineralogical Record: 1: 92-96.

Synonyms of EakeriteHide

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Other Language Names for EakeriteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Other InformationHide

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Notes:

Not soluble in acids or bases.

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 EakeriteHide

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References for EakeriteHide

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Reference List:

Gaydukova, V.S., Grigor'yev, I.M., Dubinchuk, V.T., Il'yasov, A.M., Kuz'min, V.I., Sidorenko, G.A. (1982) Exsolution of stanniferous garnets. Doklady Akademii Nauk SSSR: 250: 151-153. (in Russian)

Localities for EakeriteHide

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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

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- 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.

Russia
Republic of Karelia Pitkyarantsky District Kitelya ⓘ Kitelskoe Sn-Zn deposit
ⓘ Pitkyaranta mining district	Ivashchenko et al. (2011, September)
USA (TL)
North Carolina Cleveland County Kings Mountain ⓘ Foote Lithium Co. Mine (TL)	Horton et al. (1981) +2 other references