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Clinojimthompsonite

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Formula:
(Mg,Fe)5Si6O16(OH)2
System:
Monoclinic
Hardness:
2 - 2½
This page provides mineralogical data about Clinojimthompsonite.

Classification of Clinojimthompsonite

Approved
9.DF.05

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
67.1.1.2

67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3
14.21.12

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

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°
Max Birefringence:
δ = 0.023
Image 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)5Si6O16(OH)2
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Mn,Ca,Na

Relationship of Clinojimthompsonite to other Species

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O
9.DF.15ParaershoviteNa3K3Fe23+Si8O20(OH)4 · 4H2O
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2
9.DF.30BigcreekiteBaSi2O5 · 4H2O
14.21.1Olivine(Mg,Fe2+)2SiO4
14.21.2Ringwoodite(Mg,Fe2+)2SiO4
14.21.3Wadsleyite(Mg,Fe2+)2(SiO4)
14.21.4ClinoferrosiliteFe2+SiO3
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.6Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.7 Magnesiocummingtonite
14.21.8Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
14.21.9Minnesotaite(Fe,Mg)3(Si4O10)(OH)2
14.21.10Chesterite(Mg,Fe)17Si20O54(OH)6
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2
14.21.13MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
14.21.14Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40

Other Names for Clinojimthompsonite

Other Information

Health Risks:
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

Localities for Clinojimthompsonite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
Droop, G.T.R. (1994) Triple-chain pyriboles in Lewisian ultramafic rocks. Mineralogical Magazine, 58, 11, 1-20.
USA (TL)
 
  • Vermont
    • Windsor Co.
      • Chester
AmMin 63:1000
Mineral and/or Locality  
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