Jimthompsonite

Jimthompsonite

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite

Carlton Quarry, Chester, Windsor County, Vermont, USA

Jimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

About JimthompsoniteHide

James B. Thompson, Jr.

Formula:

(Mg,Fe)₅Si₆O₁₆(OH)₂

Colour:

Colorless to very light pinkish brown

Lustre:

Vitreous, Sub-Vitreous

Hardness:

6 - 7

Specific Gravity:

3.05 (Calculated)

Crystal System:

Orthorhombic

Name:

Named by David R. Veblen and Charles W. Burnham in 1978 in honor of James (Jim) B. Thompson, jr., [November 20, 1921 Calais, Maine, USA - November 15, 2011, Calais, Maine, USA], mineralogist and petrologist, late professor/emeritus at Harvard University, USA.

Type Locality:

ⓘ Carlton Quarry (Carleton Talc Mine), Chester, Windsor County, Vermont, USA

Jimthompsonite occurs as ultra-microscopic intergrowths within other host minerals, generally amphiboles such as anthophyllite or cummingtonite-series minerals. Jimthompsonite is generally not visible to the naked eye, but instead is observable optically or by transmission electron microscopy.

Unique IdentifiersHide

IMA Classification of JimthompsoniteHide

Classification of JimthompsoniteHide

Mineral SymbolsHide

Physical Properties of JimthompsoniteHide

Optical Data of JimthompsoniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.605 n_β = 1.626 n_γ = 1.633

2V:

Measured: 62° , Calculated: 58°

Birefringence:

0.028

Max Birefringence:

δ = 0.028

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Moderate

Dispersion:

r > v weak

Optical Extinction:

Parallel. XYZ = abc.

Pleochroism:

Non-pleochroic

Chemistry of JimthompsoniteHide

Crystallography of JimthompsoniteHide

Crystal StructureHide

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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)
0000687	Jimthompsonite	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 closedata_global _chemical_name_mineral 'Jimthompsonite' loop_ _publ_author_name 'Veblen D R' 'Burnham C W' _journal_name_full 'American Mineralogist' _journal_volume 63 _journal_year 1978 _journal_page_first 1053 _journal_page_last 1073 _publ_section_title ; New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction ; _database_code_amcsd 0000687 _chemical_formula_sum '(Mg3.892 Fe1.108) Si6 (O18 H2)' _cell_length_a 18.626 _cell_length_b 27.230 _cell_length_c 5.297 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 2686.564 _exptl_crystal_density_diffrn 3.041 _symmetry_space_group_name_H-M 'P b c a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '1/2+x,y,1/2-z' '1/2-x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Mg1 0.12565 0.27883 0.89663 0.94000 0.00545 Fe1 0.12565 0.27883 0.89663 0.06000 0.00545 Mg2 0.12535 0.33533 0.39566 0.84400 0.00735 Fe2 0.12535 0.33533 0.39566 0.15600 0.00735 Mg3 0.12506 0.39257 0.89577 0.92200 0.00532 Fe3 0.12506 0.39257 0.89577 0.07800 0.00532 Mg4 0.12485 0.45165 0.39642 0.98900 0.00443 Fe4 0.12485 0.45165 0.39642 0.01100 0.00443 Fe5 0.12369 0.50609 0.89507 0.80300 0.00697 Mg5 0.12369 0.50690 0.89507 0.19700 0.00697 Si1a 0.27111 0.27787 0.55967 1.00000 0.00380 Si2a 0.26964 0.39005 0.56980 1.00000 0.00507 Si3a 0.27242 0.44700 0.06669 1.00000 0.00532 Si1b 0.48025 0.27769 0.26700 1.00000 0.00418 Si2b 0.48078 0.38929 0.27278 1.00000 0.00545 Si3b 0.47579 0.44553 0.77466 1.00000 0.00595 O-Ha 0.18329 0.33519 0.06241 1.00000 0.00621 O-Hb 0.56861 0.33513 0.76931 1.00000 0.00633 O1a 0.30061 0.24981 0.31159 1.00000 0.00823 O2a 0.18399 0.27777 0.56140 1.00000 0.00507 O3a 0.29949 0.33407 0.55638 1.00000 0.00861 O4a 0.18325 0.39170 0.56291 1.00000 0.00633 O5a 0.29980 0.41491 0.82585 1.00000 0.00925 O6a 0.30187 0.42028 0.33148 1.00000 0.00874 O7a 0.18560 0.44852 0.06801 1.00000 0.00697 O8a 0.31330 0.49841 0.08080 1.00000 0.00773 O1b 0.45141 0.24443 0.03443 1.00000 0.00684 O2b 0.56718 0.27792 0.26828 1.00000 0.00519 O3b 0.45168 0.33338 0.23045 1.00000 0.00823 O4b 0.56725 0.39207 0.27127 1.00000 0.00760 O5b 0.44881 0.42441 0.05168 1.00000 0.00747 O6b 0.45138 0.40886 0.54386 1.00000 0.00963 O7b 0.56296 0.44849 0.77718 1.00000 0.00798 O8b 0.43394 0.49561 0.71391 1.00000 0.00785

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of JimthompsoniteHide

Synonyms of JimthompsoniteHide

Other Language Names for JimthompsoniteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of JimthompsoniteHide

Other InformationHide

Internet Links for JimthompsoniteHide

References for JimthompsoniteHide

Reference List:

Veblen, D.R., Burnham, C.W. (1978) New biopyriboles from Chester, Vermont: I. Descriptive mineralogy. American Mineralogist, 63, 1000-1009.

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.

Localities for JimthompsoniteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

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

Finland
Southwest Finland Salo Kisko ⓘ Orijärvi deposit	Schumacher, J. & Czank, M. 1987. Mineralogy of triple- and double-chain pyriboles from Orijärvi, southwest Finland. The American Mineralogist 72 (3-4), 345-352.
Greenland
Sermersooq Nuuk ⓘ Isua Greenstone Belt (Isua Supercrustal Belt)	epsc.wustl.edu (2008) http://epsc.wustl.edu/admin/whatsnew/photo_album/week/pw2006-12-06.htm
Italy
Piedmont Verbano-Cusio-Ossola Province Montescheno ⓘ I Mondei (Ca' Mondei)	Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
Japan
Iwate Prefecture Hanamaki City ⓘ Mount Hayachine	Konishi et al (1991) Koubutsu-Gakkai Kou'en-Youshi, 101.
Norway
Nordland Meløy ⓘ Glomfjord	Rune S. Selbekk (2010) Norges mineraler - En revidert utgave av Norges mineraler (Neumann 1985) Tapir Akademiske Forlag, Trondheim. p.1-552.
Switzerland
Ticino ⓘ Agro Valley	Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229.
Vallemaggia Lavizzara Fusio ⓘ Bena Alp	Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
ⓘ Pizzo di Röd	Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
UK
Scotland Highland North， West and Central Sutherland ⓘ Achmelvich dike	Droop, G.T.R. (1994) Triple-chain pyriboles in Lewisian ultramafic rocks. Mineralogical Magazine, 58, 11, 1-20.
USA (TL)
Vermont Windsor County Chester ⓘ Carlton Quarry (Carleton Talc Mine) (TL)	Veblen, D.R., Burnham, C.W. (1978) New Biopyriboles from Chester Vermont: I. Descriptive Mineralogy. American Mineralogist, 63:1000-1009. Gait, R.I., Veblen, D.R. (1996) Chesterite, Jimthompsonite, and Clinojimthompsonite: From the Type Locality Carlton Quarry, Chester, Windsor County, Vermont. Rocks & Minerals, 71:4, 275-280.