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Jeffreyite

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Formula:
(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
System:
Orthorhombic
Colour:
colourless
Hardness:
5
This page provides mineralogical data about Jeffreyite.

Classification of Jeffreyite

Approved 1982
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
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First Recorded Occurrence of Jeffreyite

Year of Discovery:
1982

Physical Properties of Jeffreyite

Colour:
colourless
Streak:
white
Hardness (Mohs):
5
Cleavage:
Perfect

Crystallography of Jeffreyite

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.9Å, b = 14.9Å, c = 40.41Å
Ratio:
a:b:c = 1 : 1 : 2.712
Unit Cell Volume:
V 8,971.42 ų (Calculated from Unit Cell)

Optical Data of Jeffreyite

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 Jeffreyite

Formula:
(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
Essential elements:
All elements listed in formula:

Relationship of Jeffreyite to other Species

9.BB.10ÅkermaniteCa2Mg(Si2O7)
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4
9.BB.10GehleniteCa2Al(AlSiO7)
9.BB.10GugiaiteCa2Be(Si2O7)
9.BB.10HardystoniteCa2Zn(Si2O7)
9.BB.10OkayamaliteCa2B(BSiO7)
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
9.BB.15BaryliteBe2Ba(Si2O7)
9.BB.15Barylite-1OBe2Ba(Si2O7)
9.BB.20AndrémeyeriteBaFe22+(Si2O7)
14.3.1PhenakiteBe2SiO4
14.3.2BertranditeBe4(Si2O7)(OH)2
14.3.3BerylliteBe3(SiO4)(OH)2 · H2O
14.3.4LiberiteLi2BeSiO4
14.3.5ChkaloviteNa2BeSi2O6
14.3.6EudidymiteNa2Be2Si6O15 · H2O
14.3.7EpididymiteNa2Be2Si6O15 · H2O
14.3.8GugiaiteCa2Be(Si2O7)
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4
14.3.11BaryliteBe2Ba(Si2O7)
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
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)2
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4
14.3.17TrimeriteCaMn22+Be3(SiO4)3
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Other Names for Jeffreyite

Name in Other Languages:
German:Jeffreyit
Spanish:Jeffreyita

Other Information

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 Jeffreyite

Reference List:
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.

Internet Links for Jeffreyite

Localities for Jeffreyite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • 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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