Pumpellyite-(Mg) (original) (raw)
A valid IMA mineral species - grandfathered
About Pumpellyite-(Mg)Hide
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Formula:
Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH)
Colour:
Green, blue, blackish green, brown
Crystal System:
Monoclinic
Name:
Named in 1925 by Charles Palache and Helen E. Vassar in honor of US geologist, Raphael Pumpelly [September 8, 1837 Owego, New York, USA – August 10, 1923 Newport, Rhode Island, USA]. The chemical suffix was added in 1973 by the IMA. Pumpelly was an active mining consultant and was professor of Mining Science at Harvard University. He was appointed director of the New England branch of the U. S. Geological Survey in 1884.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3309:7
bf8cd5d2-a90d-4174-a6ec-dda5eb12f2e0
IMA Classification of Pumpellyite-(Mg)Hide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Type description reference:
Classification of Pumpellyite-(Mg)Hide
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9.BG.20
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.2.7
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.11.7
16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Pmp-Mg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Pmp | Kretz (1983) | Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279. |
| Pmp | Siivolam & Schmid (2007) | Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download |
| Pmp | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Pmp | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Pumpellyite-(Mg)Hide
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Transparency:
Translucent, Opaque
Colour:
Green, blue, blackish green, brown
Cleavage:
Distinct/Good
Distinct on {001} and {100}.
Density:
3.18(3) g/cm3 (Measured) 3.20 g/cm3 (Calculated)
Optical Data of Pumpellyite-(Mg)Hide
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RI values:
_n_α = 1.674 - 1.748 _n_β = 1.675 - 1.754 _n_γ = 1.688 - 1.764
2V:
Measured: 70° to 90°, Calculated: 32° to 76°
δ = 0.014 - 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
relatively strong
Comments:
X = nearly colorless to pale greenish yellow; Y = blue-green; Z = almost colorless to brownish yellow.
Chemistry of Pumpellyite-(Mg)Hide
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Mindat Formula:
Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH)
Crystallography of Pumpellyite-(Mg)Hide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.83(1) Å, b = 5.90(1) Å, c = 19.17(2) Å
β = 97.10°
Ratio:
a:b:c = 1.497 : 1 : 3.249
Unit Cell V:
991.04 ų (Calculated from Unit Cell)
Morphology:
Bladed, typically elongated along [010]; in stellate clusters, fibrous, or dense mats.
Twinning:
Common on {001} and {100}
Comment:
Non-standard space group A2/m.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0017597 | Pumpellyite-(Mg) | Hamada M, Akasaka M, Seto S, Makino K (2010) Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan American Mineralogist 95 1294-1304 |  |
2010 | Osayama ultramafic body, Okayama, Japan | 0 | 293 |
| 0017598 | Pumpellyite-(Mg) | Hamada M, Akasaka M, Seto S, Makino K (2010) Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan American Mineralogist 95 1294-1304 | |
2010 | Osayama ultramafic body, Okayama, Japan | 0 | 293 |
| 0017600 | Pumpellyite-(Mg) | Hamada M, Akasaka M, Seto S, Makino K (2010) Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan American Mineralogist 95 1294-1304 | |
2010 | Osayama ultramafic body, Okayama, Japan | 0 | 293 |
| 0017601 | Pumpellyite-(Mg) | Hamada M, Akasaka M, Seto S, Makino K (2010) Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan American Mineralogist 95 1294-1304 | |
2010 | Osayama ultramafic body, Okayama, Japan | 0 | 293 |
| 0007760 | Pumpellyite-(Mg) | Artioli G, Geiger C A (1994) The crystal chemistry of pumpellyite: An X-ray Rietveld refinement and 57Fe Mossbauer study Physics and Chemistry of Minerals 20 443-453 | 1994 | Keweenawan, Michigan | 0 | 293 | |
| 0009365 | Pumpellyite-(Mg) | Galli E, Alberti A (1969) On the crystal structure of pumpellyite Acta Crystallographica B25 2276-2281 |  |
1969 | 0 | 293 | |
| 0018298 | Pumpellyite-(Mg) | Nagashima M, Akasaka M, Ikeda K, Kyono A, Makino K (2010) X-ray single-crystal and optical spectroscopic study of chromian pumpellyite from Sarany, Urals, Russia Journal of Mineralogical and Petrological Sciences 105 187-193 | 2010 | Sarany, Ural Mountains, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.90 Å | (100) |
| 3.79 Å | (50) |
| 2.74 Å | (50) |
| 2.452 Å | (40) |
| 2.64 Å | (30) |
| 2.210 Å | (30) |
| 1.597 Å | (30) |
Geological EnvironmentHide
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Type Occurrence of Pumpellyite-(Mg)Hide
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Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 90919.
National Museum of Natural History, Washington, D.C., USA, 95279-95281.
The Natural History Museum, London, England, 1926, 225-226.
Reference:
Palache, C., Vassar, H.E. (1925) Some minerals of the Keweenawan copper deposits: pumpellyite, a new mineral; sericite; saponite. American Mineralogist: 10: 412-418.
Synonyms of Pumpellyite-(Mg)Hide
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Other Language Names for Pumpellyite-(Mg)Hide
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Varieties of Pumpellyite-(Mg)Hide
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| Chlorastrolite | Chatoyant and generally exhibits a distinctive and attractive mosaic or segmented pattern, sometimes referred to as "turtleback". State gemstone of Michigan.Originally described from Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA. |
|---|
Relationship of Pumpellyite-(Mg) to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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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 Pumpellyite-(Mg)Hide
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References for Pumpellyite-(Mg)Hide
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Reference List:
Fleischer, Michael, Pabst, Adolf, Mandarino, Joseph A., Chao, George Y., Cabri, Louis, J. (1976) New Mineral Names. American Mineralogist, 61 (1-2) 174-186
Dunn, P. J., Fleischer, M., Chao, G. Y., Cabri, L. J., Mandarino, J. A. (1983) New mineral names. American Mineralogist, 68 (11-12) 1248-1252
Localities for Pumpellyite-(Mg)Hide
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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.