Clinojimthompsonite
A valid IMA mineral species
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About Clinojimthompsonite
Formula:
(Mg,Fe)5Si6O16(OH)2
Colour:
Colorless to pale tan-brown
Lustre:
Vitreous, Sub-Vitreous
Hardness:
2 - 2½
Specific Gravity:
3.02 (Calculated)
Crystal System:
Monoclinic
Name:
Named for James Burleigh Thompson, Jr. [November 20, 1921 Calais, Maine, USA - November 15, 2011 Lexington, Massachusetts, USA] and for being the monoclinic polymorph of jimthompsonite. He was an author of some 41 articles in international journals and professional volumes as well as 12 field guides and four geologic maps. James Thompson's career was almost entirely at Harvard University. His most widely applauded work was in "phase space" studies: "Then in 1957 with “The Graphical Analysis of Mineral Assemblages in Pelitic Schists,” he introduced graphical projections for the analysis of mineral assemblages in multicomponent systems that led to thermodynamic and conceptual tools for the analysis of chemically open systems and other tools. This work is indelibly woven into the fabric of much of the research on metamorphic rocks being published today." His memberships and awards include: member of the National Academy of Sciences, and American Academy of Arts and Sciences. He received the Arthur L. Day Medal from the Geological Society of America (1964), the Roebling Medal from the Mineralogical Society of America (1979), and the Victor M. Goldschmidt Medal from the Geo-chemical Society (1985). He received a Ford Faculty Fellowship (1952-1953), a Guggenheim Fellowship (1963), and he was an Ernst Cloos Memorial Scholar at Johns Hopkins University (1983) and a Fairchild Distinguished Scholar at California Institute of Technology (1976), among numerous distinguished lectureships. Thompson also received an honorary doctorate from Dartmouth College in Hanover, New Hampshire. He was president of the Mineralogical Society of America in 1967-1968, as well as of the Geochemical Society in 1968 and 1969. He served in the US Armed Services during WWII.
Isostructural with:
Unique Identifiers
Mindat ID:
1078
Long-form identifier:
mindat:1:1:1078:4
GUID
(UUID V4):
(UUID V4):
9f87b787-afb2-4fe1-b75d-f68eff298686
IMA Classification of Clinojimthompsonite
Classification of Clinojimthompsonite
9.DF.05
9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
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
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
14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cjim | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Clinojimthompsonite
Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless to pale tan-brown
Streak:
Colorless to white
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Theoretically {110} prefect, based on structural analysis from the type locality. The mineral is too small to observe visually.
Theoretically {110} prefect, based on structural analysis from the type locality. The mineral is too small to observe visually.
Fracture:
Splintery
Density:
3.02 g/cm3 (Calculated)
Optical Data of Clinojimthompsonite
Type:
Biaxial (-)
RI values:
nα = 1.610 nβ = 1.630 nγ = 1.633
2V:
Measured: 65° , Calculated: 40°
Birefringence:
0.023
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Optical Extinction:
N ∧ c ≈ 10º.
Pleochroism:
Non-pleochroic
Comments:
Clinojimthompsonite from the type locality occurs in thin streaks frequently less than 2 μm and thus may be essentially invisible in thin sections.
Chemistry of Clinojimthompsonite
Mindat Formula:
(Mg,Fe)5Si6O16(OH)2
Common Impurities:
Al,Mn,Ca,Na
Crystallography of Clinojimthompsonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.8744 Å, b = 27.243 Å, c = 5.3163 Å
β = 109.47°
β = 109.47°
Ratio:
a:b:c = 0.362 : 1 : 0.195
Unit Cell V:
1,348.35 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Lath-like, splintery, to fibrous
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000688 | Clinojimthompsonite | Veblen D R, Burnham C W (1978) New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction American Mineralogist 63 1053-1073 |  | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 13.6 Å | (73) |
| 8.809 Å | (100) |
| 6.809 Å | (16) |
| 5.103 Å | (12) |
| 4.734 Å | (33) |
| 4.539 Å | (21) |
| 4.404 Å | (11) |
| 4.036 Å | (31) |
| 3.991 Å | (9) |
| 3.864 Å | (6) |
| 3.843 Å | (7) |
| 3.759 Å | (4) |
| 3.590 Å | (6) |
| 3.559 Å | (27) |
| 3.404 Å | (2) |
| 3.364 Å | (4) |
| 3.250 Å | (31) |
| 3.173 Å | (3) |
| 3.129 Å | (5) |
| 3.114 Å | (5) |
| 3.083 Å | (60) |
| 2.976 Å | (30) |
| 2.936 Å | (7) |
| 2.888 Å | (2) |
| 2.816 Å | (7) |
| 2.756 Å | (3) |
| 2.711 Å | (6) |
| 2.696 Å | (8) |
| 2.639 Å | (56) |
| 2.615 Å | (29) |
| 2.597 Å | (8) |
| 2.551 Å | (2) |
| 2.506 Å | (42) |
| 2.476 Å | (4) |
| 2.427 Å | (5) |
| 2.393 Å | (8) |
| 2.352 Å | (2) |
| 2.307 Å | (1) |
| 2.281 Å | (10) |
| 2.244 Å | (12) |
| 2.235 Å | (26) |
| 2.194 Å | (5) |
| 2.182 Å | (29) |
| 2.177 Å | (21) |
| 2.153 Å | (1) |
| 2.087 Å | (13) |
| 2.071 Å | (4) |
| 2.044 Å | (3) |
| 2.027 Å | (1) |
Comments:
ICDD 31-639
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 38 : Ophiolites |
Type Occurrence of Clinojimthompsonite
General Appearance of Type Material:
An ultramicroscopic mineral intergrown in anthophyllite, jimthomsonite, and possibly chesterite. It is intergrown in "streaks" that may be only 2 μm across and thus is not possible to sight identify in type.
Place of Conservation of Type Material:
Harvard Mineralogical Museum, Cambridge, Massachusetts, USA, number 134079 (holotype).
National Museum of Natural History, Washington, D.C., USA, number 145689 (type).
Royal Ontario Museum, Toronto, Ontario, Canada, number M36083 (type).
National Museum of Natural History, Washington, D.C., USA, number 145689 (type).
Royal Ontario Museum, Toronto, Ontario, Canada, number M36083 (type).
Geological Setting of Type Material:
Metamorphosed ultramafic body.
Associated Minerals at Type Locality:
Synonyms of Clinojimthompsonite
Other Language Names for Clinojimthompsonite
Common Associates
Associated Minerals Based on Photo Data:
| 13 photos of Clinojimthompsonite associated with Jimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 12 photos of Clinojimthompsonite associated with Chesterite | (Mg,Fe)17Si20O54(OH)6 |
| 11 photos of Clinojimthompsonite associated with Anthophyllite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 |
| 10 photos of Clinojimthompsonite associated with Talc | Mg3Si4O10(OH)2 |
| 10 photos of Clinojimthompsonite associated with Magnetite | Fe2+Fe3+2O4 |
| 3 photos of Clinojimthompsonite associated with Pyrite | FeS2 |
Related Minerals - Strunz-mindat Grouping
| 9.DF. | Bohseite | Ca4Be3+xAl1-xSi9O25-x(OH)3+x |
| 9.DF.05 | Chesterite | (Mg,Fe)17Si20O54(OH)6 |
| 9.DF.05 | Jimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 9.DF.15 | Ershovite | Na4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O |
| 9.DF.15 | Paraershovite | Na3K3Fe3+2Si8O20(OH)4 · 4H2O |
| 9.DF.20 | Tvedalite | (Ca,Mn)4Be3Si6O17(OH)4 · 3H2O |
| 9.DF.25 | Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| 9.DF.30 | Bigcreekite | BaSi2O5 · 4H2O |
Other Information
Electrical:
Not believed to be fluorescent in UV
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Clinojimthompsonite
mindat.org URL:
https://www.mindat.org/min-1078.html
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References for Clinojimthompsonite
Reference List:
Localities for Clinojimthompsonite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Japan | |
| Sato & Akai (1981) |
| Tom Loomis specimen |
UK | |
| Droop (1994) |
USA (TL) | |
| Veblen et al. (1978) +1 other reference |
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Carlton Quarry, Chester, Windsor County, Vermont, USA