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Clinojimthompsonite

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About ClinojimthompsoniteHide

Formula:
(Mg,Fe)5Si6O16(OH)2
Hardness:
2 - 2½
Crystal System:
Monoclinic
Name:
Named for being the monoclinic polymorph of jimthompsonite.
This page provides mineralogical data about Clinojimthompsonite.


Classification of ClinojimthompsoniteHide

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

Physical Properties of ClinojimthompsoniteHide

Hardness:
2 - 2½ on Mohs scale

Optical Data of ClinojimthompsoniteHide

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 ClinojimthompsoniteHide

Formula:
(Mg,Fe)5Si6O16(OH)2
IMA Formula:
Mg5Si6O16(OH)2
Common Impurities:
Al,Mn,Ca,Na

Crystallography of ClinojimthompsoniteHide

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

Type Occurrence of ClinojimthompsoniteHide

Synonyms of ClinojimthompsoniteHide

Other Language Names for ClinojimthompsoniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Jimthompsonite2 photos of Clinojimthompsonite associated with Jimthompsonite on mindat.org.
Chesterite2 photos of Clinojimthompsonite associated with Chesterite on mindat.org.
Talc1 photo of Clinojimthompsonite associated with Talc on mindat.org.
Anthophyllite1 photo of Clinojimthompsonite associated with Anthophyllite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric.
9.DF.15ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
9.DF.30BigcreekiteBaSi2O5 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

67.1.1.1Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.21.1OlivineOrth.
14.21.2Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
14.21.3Wadsleyite(Mg,Fe2+)2(SiO4)Orth.
14.21.4ClinoferrosiliteFe2+SiO3Mon. 2/m : P21/b
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
14.21.6Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2Mon.
14.21.7 Magnesiocummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.8Grunerite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.21.9MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
14.21.10Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
14.21.13MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
14.21.14Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.

Other InformationHide

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 ClinojimthompsoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 63: 1000-1009, 1053-1073.

Internet Links for ClinojimthompsoniteHide

Localities for ClinojimthompsoniteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
    • Highland
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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