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Clinojimthompsonite

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

Classification of Clinojimthompsonite

IMA status:Approved
Strunz 8th edition ID:8/F.13-20
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:67.1.1.2

67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3
Hey's CIM Ref.:14.21.12

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

Type Locality:Carlton Quarry (Carleton Talc Mine), Chester, Windsor Co., Vermont, USA
Year of Discovery:1977

Physical Properties of Clinojimthompsonite

Hardness (Mohs):2 - 2½

Crystallography of Clinojimthompsonite

Crystal System:Monoclinic
Cell Parameters:a = 9.87Å, b = 27.24Å, c = 5.31Å
β = 109.47°
Ratio:a:b:c = 0.362 : 1 : 0.195
Unit Cell Volume:V 1,346.00 ų (Calculated from Unit Cell)

Optical Data of Clinojimthompsonite

Type:Biaxial (-)
RI values: nα = 1.610 nβ = 1.630 nγ = 1.633
2V:Measured: 65° , Calculated: 40°
Maximum Birefringence:δ = 0.023

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

Chemical Properties of Clinojimthompsonite

Formula:
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
Simplified for copy/paste:(Mg,Fe)5Si6O16(OH)2
Essential elements:H, Mg, O, Si
All elements listed in formula:Fe, H, Mg, O, Si
Common Impurities:Al,Mn,Ca,Na

Relationship of Clinojimthompsonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DF.05Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
9.DF.05Jimthompsonite
(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
14.21.11Jimthompsonite
(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
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40

Other Names for Clinojimthompsonite

Synonyms:
IMA1977-012
Other Languages:
German:Clinojimthompsonit
Klinojimthompsonit
Russian:Клиноджимтомпсонит
Simplified Chinese:斜镁川石
Spanish:Clinojimthompsonita

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 Clinojimthompsonite

Reference List:

- +
American Mineralogist: 63: 1000-1009, 1053-1073.

Internet Links for Clinojimthompsonite

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  • Localities for Clinojimthompsonite

    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.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Niigata Prefecture
          • Shibata City
    Tom Loomis specimen
      • Kanto Region
        • Gunma Prefecture
          • Minakami
    Sato & Akai (1981) Sanko-Gakkai Kou'en-Youshi, 174.
    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
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