Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Jeffreyite

This page is currently not sponsored. Click here to sponsor this page.
View of the Jeffrey Mine open pit -summer 2011

Jeffrey Mine, Asbestos, Les Sources RCM, Estrie, Québec, Canada
Formula:
(Ca,Na)2(Be,Al)Si2(O,OH)7
System:
Orthorhombic
Colour:
Colourless
Hardness:
5
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.


Classification of Jeffreyite

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 Jeffreyite

Diaphaneity (Transparency):
Transparent
Colour:
Colourless
Comment:
Originally found with a brownish cast due to a fungal coating.
Streak:
white
Hardness (Mohs):
5
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 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

IMA Formula:
(Ca,Na)2(Be,Al)Si2(O,OH)7
Elements listed in formula:

Crystallography of Jeffreyite

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 Volume:
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 Jeffreyite

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:

Relationship of Jeffreyite to other Species

9.BB.10ÅkermaniteCa2MgSi2O7
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4
9.BB.10GehleniteCa2Al(SiAl)O7
9.BB.10GugiaiteCa2BeSi2O7
9.BB.10HardystoniteCa2ZnSi2O7
9.BB.10OkayamaliteCa2B2SiO7
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
9.BB.15BaryliteBaBe2Si2O7
9.BB.15Barylite-1OBe2Ba(Si2O7)
9.BB.20AndrémeyeriteBaFe22+Si2O7
14.3.1PhenakiteBe2SiO4
14.3.2BertranditeBe4Si2O7(OH)2
14.3.3BerylliteBe3SiO4(OH)2 · H2O
14.3.4LiberiteLi2BeSiO4
14.3.5ChkaloviteNa2BeSi2O6
14.3.6EudidymiteNa2Be2Si6O15 · H2O
14.3.7EpididymiteNa2Be2Si6O15 · H2O
14.3.8GugiaiteCa2BeSi2O7
14.3.10Semenovite-(Ce)(Na,Ca)9Fe2+Ce2(Si,Be)20(O,OH,F)48
14.3.11BaryliteBaBe2Si2O7
14.3.12Hingganite-(Ce)BeCe(SiO4)(OH)
14.3.13Hingganite-(Yb)BeYb(SiO4)(OH)
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
14.3.15Minasgeraisite-(Y)CaBe2Y2(SiO4)2O2
14.3.16SørenseniteNa4Be2Sn(Si3O9)2 · 2H2O
14.3.17TrimeriteCaBe3Mn22+(SiO4)3
14.3.18ChiavenniteCaMn2+(BeOH)2Si5O13 · 2H2O
14.3.19TvedaliteCa4Be3Si6O17(OH)4 · 3H2O
14.3.20HarstigiteCa6Be4Mn2+(SiO4)2(Si2O7)2(OH)2
14.3.21SverigeiteNaBe2Mn22+SnSi3O12(OH)
14.3.22JoesmithitePbCa2Mg3Fe23+(Si6Be2)O22(OH)2
14.3.23Gadolinite-(Y)Fe2+Be2Y2(SiO4)2O2
14.3.24Gadolinite-(Ce)Fe2+Be2Ce2(SiO4)2O2
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Other Names for Jeffreyite

Name in Other Languages:
German:Jeffreyit
Spanish:Jeffreyita

Other Information

Other Information:
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 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.

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 Jeffreyite

mindat.org URL:
https://www.mindat.org/min-2086.html
Please feel free to link to this page.

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 (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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 27, 2017 04:09:19 Page generated: April 10, 2017 15:00:41
Go to top of page