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About ClinojimthompsoniteHide

2 - 2½
Crystal System:
Named for being the monoclinic polymorph of jimthompsonite.
This page provides mineralogical data about Clinojimthompsonite.

Classification of ClinojimthompsoniteHide


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

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

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg

Physical Properties of ClinojimthompsoniteHide

2 - 2½ on Mohs scale

Optical Data of ClinojimthompsoniteHide

Biaxial (-)
RI values:
nα = 1.610 nβ = 1.630 nγ = 1.633
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:
r > v strong

Chemical Properties of ClinojimthompsoniteHide

IMA Formula:
Common Impurities:

Crystallography of ClinojimthompsoniteHide

Crystal System:
Cell Parameters:
a = 9.87 Å, b = 27.24 Å, c = 5.31 Å
β = 109.47°
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.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,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.21.2Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
14.21.4ClinoferrosiliteFe2+SiO3Mon. 2/m : P21/b
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
14.21.7 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
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca

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

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
  • Gunma
    • Minakami
Sato & Akai (1981) Sanko-Gakkai Kou'en-Youshi, 174.
  • Niigata
    • Shibata City
Tom Loomis specimen
  • Scotland
    • Highland
Droop, G.T.R. (1994) Triple-chain pyriboles in Lewisian ultramafic rocks. Mineralogical Magazine, 58, 11, 1-20.
  • Vermont
    • Windsor Co.
      • Chester
AmMin 63:1000
Mineral and/or Locality  
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