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Jeffreyite

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View of the Jeffrey Mine open pit -summer 2011

Jeffrey Mine, Asbestos, Les Sources RCM, Estrie, Québec, Canada
Formula:
(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
Colour:
Colourless
Hardness:
5
Specific Gravity:
2.99
Crystal System:
Orthorhombic
Name:
Named by Joel D. Grice and George W. Robinson in 1984 after the Jeffrey Mine, the type locality.
This page provides mineralogical data about Jeffreyite.


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Classification of JeffreyiteHide

Approved
Approval Year:
1982
First Published:
1984
9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
55.4.2.3

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
14.3.9

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Physical Properties of JeffreyiteHide

Transparency:
Transparent
Colour:
Colourless
Comment:
Originally found with a brownish cast due to a fungal coating.
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{001}, {110}
Density:
2.99 g/cm3 (Measured)    2.98 g/cm3 (Calculated)
Comment:
methylene iodide - methyl alcohol solution at 21C

Optical Data of JeffreyiteHide

Type:
Biaxial (-)
RI values:
nα = 1.625 nβ = 1.641 nγ = 1.643
2V:
Measured: 40° , Calculated: 38°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate

Chemical Properties of JeffreyiteHide

Formula:
(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
IMA Formula:
(Ca,Na)2(Be,Al)Si2(O,OH)7

Crystallography of JeffreyiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.9 Å, b = 14.9 Å, c = 40.41 Å
Ratio:
a:b:c = 1 : 1 : 2.712
Unit Cell V:
8,971.42 ų (Calculated from Unit Cell)
Morphology:
Thin pseudotetragonal plates. The observed forms on the plates include the pinacoid
{001} and a prism, [110].
Twinning:
Twinning was observed on (100).

Type Occurrence of JeffreyiteHide

General Appearance of Type Material:
Micaceous
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 48740.
Geological Setting of Type Material:
Rodingitized granite dyke
Associated Minerals at Type Locality:

Synonyms of JeffreyiteHide

Other Language Names for JeffreyiteHide

German:Jeffreyit
Spanish:Jeffreyita

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10GugiaiteCa2Be(Si2O7)Tet.
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10OkayamaliteCa2B(BSiO7)Tet.
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm
9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

55.4.2.1FresnoiteBa2Ti(Si2O7)OTet.
55.4.2.2HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
55.4.2.4LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
55.4.2.5Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]Tet. 4 : I4
55.4.2.6GugiaiteCa2Be(Si2O7)Tet.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.3.1PhenakiteBe2SiO4Trig. 3 : R3
14.3.2BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
14.3.3BerylliteBe3(SiO4)(OH)2 · H2OOrth.
14.3.4LiberiteLi2BeSiO4Mon. m : Pm
14.3.5ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
14.3.6EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
14.3.7EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
14.3.8GugiaiteCa2Be(Si2O7)Tet.
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
14.3.11BaryliteBe2Ba(Si2O7)Orth.
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
14.3.17TrimeriteCaMn2+2Be3(SiO4)3Mon. 2/m : P21/m
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Fluorescence of JeffreyiteHide

Other InformationHide

Notes:
Not readily soluble in 20% HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for JeffreyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Robinson, G.W. (1984) Jeffreyite, (Ca,Na)2(Be,Al)Si2(O,OH)7, a new mineral species and its relation to the melilite group. Canadian Mineralogist: 22: 443-446.
Dunn, P.J., Fleischer, M., Langley, R.H., Shigley, J.E., Zilczer, J.A. (1985) New mineral names. American Mineralogist: 70: 871-881.

Internet Links for JeffreyiteHide

Localities for JeffreyiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • Québec
    • Estrie
      • Les Sources RCM
        • Asbestos
GRICE, J.D., and ROBINSON, G.W. (1984) Jeffreyite, (Ca,Na)2(Be,Al)Si2(O,OH)7, a new mineral species and its relation to the melilite Group. Canadian Mineralogist, 22, 443-446.
Mineral and/or Locality  
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