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Jimthompsonite

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Chester, Windsor Co., Vermont, USA
© 2007, J. Weissman

Formula:
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
System:OrthorhombicHardness:2 - 2½
This page provides mineralogical data about Jimthompsonite.

Classification of Jimthompsonite

IMA status:Approved
Strunz 8th edition ID:8/F.13-30
Nickel-Strunz 10th (pending) edition ID:9.DF.05

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
Dana 8th edition ID:67.1.1.1

67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3
Hey's CIM Ref.:14.21.11

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg
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Type Occurrence of Jimthompsonite

Type Locality:Carlton Mine, Carlton farm, Chester, Windsor Co., Vermont, USA
Year of Discovery:1977

Physical Properties of Jimthompsonite

Hardness (Mohs):2 - 2½

Crystallography of Jimthompsonite

Crystal System:Orthorhombic
Cell Parameters:a = 18.62Å, b = 27.23Å, c = 5.29Å
Ratio:a:b:c = 0.684 : 1 : 0.194
Unit Cell Volume:V 2,682.15 ų (Calculated from Unit Cell)

Optical Data of Jimthompsonite

Type:Biaxial (-)
RI values: nα = 1.605 nβ = 1.626 nγ = 1.633
2V:Measured: 62° , Calculated: 58°
Maximum Birefringence:δ = 0.028

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:strong

Chemical Properties of Jimthompsonite

Formula:
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
Essential elements:H, Mg, O, Si
All elements listed in formula:Fe, H, Mg, O, Si
Common Impurities:Al,Mn,Ca,Na,H2O

Relationship of Jimthompsonite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DF.05Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
9.DF.05Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.15Ershovite
Na
 
4
K
 
3
(Fe,Mn,Ti)
 
2
Si
 
8
O
 
22
(OH)
 
4
·4H
 
2
O
9.DF.20Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
·3H
 
2
O
9.DF.25Bavenite
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
9.DF.30Bigcreekite
BaSi
 
2
O
 
5
·4H
 
2
O
Related Minerals - Hey's Index Grouping:
14.21.1Olivine
(Mg,Fe
2+
 
)
 
2
[SiO
 
4
]
14.21.2Ringwoodite
(Mg,Fe
2+
 
)
 
2
[SiO
 
4
]
14.21.3Wadsleyite
(Mg,Fe
2+
 
)
 
2
[SiO
 
4
]
14.21.4Clinoferrosilite
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
14.21.5Anthophyllite
☐[Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
14.21.6Cummingtonite
[ ][Mg
 
2
][Mg
 
5
][(OH)
 
2
|Si
 
8
O
 
22
]
14.21.7 Magnesiocummingtonite
14.21.8Grunerite
[ ][Fe
2+
2
][Fe
2+
5
][(OH)
 
2
|Si
 
8
O
 
22
]
14.21.9Minnesotaite
(Fe,Mg)
 
3
Si
 
4
O
 
10
(OH)
 
2
14.21.10Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
14.21.12Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
14.21.13Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
[SiO
 
4
]
 
3
14.21.14Balangeroite
(Mg,Fe,Fe,Mn)
 
42
Si
 
16
O
 
54
(OH)
 
40

Other Names for Jimthompsonite

Synonyms:
IMA1977-011
German names:
Jimthompsonit
Russian names:
Джимтомпсонит
Spanish names:
Jimthompsonita

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 Jimthompsonite

Reference List:American Mineralogist (1978): 63: 1000-1009, 1053-1073.

Internet Links for Jimthompsonite

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    Localities for Jimthompsonite

    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.
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    (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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Nuuk (Godthåb)
    		http://epsc.wustl.edu/admin/whatsnew/photo_album/week/pw2006-12-06.htm
    Italy
     
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Ossola Valley
          • Antrona Valley
            • Montescheno
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Iwate Prefecture
          • Kitakami Mts
    		Konishi et al (1991) Koubutsu-Gakkai Kou'en-Youshi, 101.
    UK
     
    • Scotland
      • North West Highlands (Sutherland)
    		Droop, G.T.R. (1994) Triple-chain pyriboles in Lewisian ultramafic rocks. Mineralogical Magazine, 58, 11, 1-20.
    USA
     
    • Vermont
      • Windsor Co.
        • Chester
          • Carlton farm
    		AmMin 63:1000
    Mineral and/or Locality
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