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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), Asbestos, Shipton Township, Richmond Co., 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.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,Ca)
 
9
Fe
2+
 
(Ce,La)
 
2
[(Si,Be)
 
5
(O,OH,F)
 
12
]
 
4
14.3.11Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
14.3.12Hingganite-(Ce)
Ce
 
2
□Be
 
2
Si
 
2
O
 
8
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y)Be[OH|SiO
 
4
]
14.3.14Hingganite-(Y)
(Y,Yb,Er)Be[OH|SiO
 
4
]
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
[(Ca,Pb)][(Ca,Pb)
 
2
][(Mg,Fe
2+
 
)
 
5
][(OH)
 
2
|BeSi
 
7
O
 
22
]
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,Ca)
 
2
(Fe,Fe)Be
 
2
Si
 
2
(O,OH)
 
10

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.

Articles/Blogs about Jeffreyite

Internet Links for Jeffreyite

Search Engines:
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  • Look for Jeffreyite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Jeffreyite in the Natural History Museum (London) online catalogue
  • Jeffreyite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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    Localities for Jeffreyite

    (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
      • Richmond Co.
        • Shipton Township
          • Asbestos
    		Min.Rec.:20(5):393.
    Mineral and/or Locality
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