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Jimthompsonite

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Chester, Windsor Co., Vermont, USA
© 2007, JGW

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Formula:
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
System:OrthorhombicColour:colorless to very light ...
Name:
Named by David R. Veblen and Charles W. Burnham in 1978 in honor of James (Jim) B. Thompson, jr., [1921-2011, Calais, Maine, USA], mineralogist and petrologist, professor emeritus at Harvard University, USA.
This page provides mineralogical data about Jimthompsonite.

Classification of Jimthompsonite

IMA status:Approved 1977
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 Quarry (Carleton Quarry), Chester, Windsor Co., Vermont, USA
General Appearance of Type Material:Occurs as fibrous crystals or microscopic intergrowths parallel to (010) in anthophyllite and cummingtonite.
Year of Discovery:1977
Geological Setting of type material:Found in the blackwall zone of a metamorphosed ultramafic body
Associated Minerals at type locality:
TalcMagnetiteCummingtoniteCummingtoniteClinochlore
ChesteriteAnthophylliteActinolite

Physical Properties of Jimthompsonite

Lustre:Vitreous, Sub-Vitreous
Diaphaneity (Transparency):Transparent
Colour:colorless to very light pinkish brown
Streak:Colorless
Comment:Undetermined; presumably similar to amphibole.
Tenacity:Brittle
Cleavage:Perfect
{210}
Fracture:Splintery
Density (calculated):3.05 g/cm3

Crystallography of Jimthompsonite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbca {P21/b 21/c 21/a}
Space Group Setting:Pbca
Cell Parameters:a = 18.626Å, b = 27.23Å, c = 5.297Å
Ratio:a:b:c = 0.684 : 1 : 0.195
Unit Cell Volume:V 2,686.56 ų (Calculated from Unit Cell)
Z:8
Morphology:Fibrous to 5 cm
X-Ray Powder Diffraction:
d-spacingIntensity
13.6 (60)
8.81 (100)
3.81 (30)
3.25 (40)
3.09 (50)
2.74 (30)
2.60 (40)
2.55 (30)
Comments:ICDD 31-638 (calculated)

Optical Data of Jimthompsonite

Type:Biaxial (-)
RI values: nα = 1.605 nβ = 1.626 nγ = 1.633
2V:Measured: 62° , Calculated: 58°
Birefringence:0.028
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:r > v weak
Optical Extinction:Parallel. XYZ = abc
Pleochroism:Non-pleochroic

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.15Paraershovite
Na
 
3
K
 
3
Fe
3+
2
Si
 
8
O
 
20
(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+
 
SiO
 
3
14.21.5Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.6Cummingtonite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.7 Magnesiocummingtonite
14.21.8Grunerite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
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
Other Languages:
German:Jimthompsonit
Russian:Джимтомпсонит
Simplified Chinese:镁川石
Spanish:Jimthompsonita

Other Information

Fluorescence in UV light:Not fluorescent
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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  • Raman and XRD data at RRUFF project
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  • Jimthompsonite details from Handbook of Mineralogy (PDF)
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    • Localities for Jimthompsonite

    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.
    Hide Locality List
    (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.
    Switzerland
     
    • Ticino (Tessin)
      • Maggia Valley
        • Lavizzara Valley
          • Fusio
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
      • Verzasca Valley
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229.
    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
    		AmMin 63:1000
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. 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. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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