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|System:||Monoclinic||Colour:||Green, blue, blackish ...|
|Name:||For US geologist, Raphael Pumpelly (1837-1923).|
Classification of Pumpellyite-(Mg)
|Strunz 8th edition ID:||8/C.24-30|
|Nickel-Strunz 10th (pending) edition ID:||9.BG.20|
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral  and greater coordination
|Dana 8th edition ID:||188.8.131.52|
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in  and higher coordination; single and double groups (n = 1, 2)
|Hey's CIM Ref.:||16.11.7|
16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis
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Type Occurrence of Pumpellyite-(Mg)
|Type Locality:||Keweenaw Co., Michigan, USA|
Physical Properties of Pumpellyite-(Mg)
|Colour:||Green, blue, blackish green, brown|
Crystallography of Pumpellyite-(Mg)
Optical Data of Pumpellyite-(Mg)
|RI values:||nα = 1.674 - 1.748 nβ = 1.675 - 1.754 nγ = 1.688 - 1.764|
|2V:||Measured: 70° to 90°, Calculated: 32° to 76°|
|Maximum Birefringence:||δ = 0.014 - 0.016|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Pumpellyite-(Mg)
|Essential elements:||Al, Ca, H, Mg, O, Si|
|All elements listed in formula:||Al, Ca, H, Mg, O, Si|
Relationship of Pumpellyite-(Mg) to other Species
|Series:||Forms a series with Julgoldite-(Fe2+) (see here)|
Forms a series with Pumpellyite-(Fe2+) (see here)
|Member of:||Pumpellyite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Pumpellyite-(Mg)
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Pumpellyite-(Mg)
American Mineralogist (1925): 10: 412-418.
American Mineralogist (1976): 61: 176-177.
American Mineralogist (1983): 68: 1250.
American Mineralogist (1985): 70: 1011.
American Mineralogist (1992): 77: 1307-1308.
Internet Links for Pumpellyite-(Mg)
Localities for Pumpellyite-(Mg)
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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