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Jeffreyite

Formula:
(Ca,Na)
 
2
(Be,Al)[Si
 
2
O
 
6
(O,OH)]
System:OrthorhombicColour:colourless
Hardness:5
This page provides mineralogical data about Jeffreyite.

Classification of Jeffreyite

IMA status:Approved 1982
Strunz 8th edition ID:8/C.02-60
Nickel-Strunz 10th (pending) edition ID:9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID: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
Hey's CIM Ref.:14.3.9

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Type Occurrence of Jeffreyite

Type Locality:Jeffrey mine (Jeffrey quarry; Johns-Manville mine), Asbestos, Les Sources RCM, Estrie, Québec, Canada
Year of Discovery:1984

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°
Maximum Birefringence:δ = 0.018

Chart 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)[Si
 
2
O
 
6
(O,OH)]
Essential elements:Be, Ca, O, Si
All elements listed in formula:Al, Be, Ca, H, Na, O, Si

Relationship of Jeffreyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg[Si
 
2
O
 
7
]
9.BB.10Cebollite
Ca
 
5
Al
 
2
Si
 
3
O
 
12
(OH)
 
4
 or near
9.BB.10Gehlenite
Ca
 
2
Al[AlSiO
 
7
]
9.BB.10Gugiaite
Ca
 
2
Be[Si
 
2
O
 
7
]
9.BB.10Hardystonite
Ca
 
2
Zn[Si
 
2
O
 
7
]
9.BB.10Okayamalite
Ca
 
2
B[BSiO
 
7
]
9.BB.10IMA2008-049
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
9.BB.15Clinobarylite
BaBe
 
2
Si
 
2
O
 
7
9.BB.20Andrémeyerite
BaFe
2+
2
[Si
 
2
O
 
7
]
Related Minerals - Hey's Index Grouping:

- +
14.3.1Phenakite
Be
 
2
[SiO
 
4
]
14.3.2Bertrandite
Be
 
4
[(OH)
 
2
|Si
 
2
O
 
7
]
14.3.3Beryllite
Be
 
3
[(OH)
 
2
|SiO
 
4
] · H
 
2
O
14.3.4Liberite
Li
 
2
Be[SiO
 
4
]
14.3.5Chkalovite
Na
 
2
BeSi
 
2
O
 
6
14.3.6Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
14.3.7Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
·H
 
2
O
14.3.8Gugiaite
Ca
 
2
Be[Si
 
2
O
 
7
]
14.3.10Semenovite-(Ce)
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
14.3.11Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
14.3.12Hingganite-(Ce)
(Ce,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.14Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.15Minasgeraisite-(Y)
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
14.3.16Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
14.3.17Trimerite
CaMn
2+
2
Be
 
3
[SiO
 
4
]
 
3
14.3.18Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
·2H
 
2
O
14.3.19Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
·3H
 
2
O
14.3.20Harstigite
Ca
 
6
(Mn,Mg)Be
 
4
Si
 
6
(O,OH)
 
24
14.3.21Sverigeite
NaMnMgSnBe
 
2
Si
 
3
O
 
12
(OH)
14.3.22Joesmithite
PbCa
 
2
Mg
 
3
Fe
3+
2
[Si
 
6
Be
 
2
O
 
22
](OH)
 
2
14.3.23Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.24Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.25Calciogadolinite-(Y)
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2

Other Names for Jeffreyite

Synonyms:
IMA1982-075IMA1982-095
Other Languages:
German:Jeffreyit
Spanish:Jeffreyita

Other Information

Health Warning: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:American Mineralogist: 70: 872.

Canadian Mineralogist (1984): 22: 443-446.

Internet Links for Jeffreyite

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  • Raman and XRD data at RRUFF project
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  • Jeffreyite details from Handbook of Mineralogy (PDF)
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    Localities for Jeffreyite

    Hide Locality List
    The 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. ? 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
    		Min.Rec.:20(5):393.; Horváth & Spertini (2008 & 2009)
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 05:49:12