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Mineralpedia Details for Pumpellyite-(Mg)

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Pumpellyite-(Mg)

Pumpellyite-(Mg)

Named for Raphael Pumpelly, a United States geologist and forerunner in the study of the paragenesis minerals in copper deposits in the Keweenaw Peninsula in Michigan, USA. Additionally named for its magnesium content over other minerals. Other members of the Pumpellyite Group include Pumpellyite-(Fe2+), (Fe3+), (Mn2+), and (Al). Somewhat uncommon, but widespread, Pumpellyite can be found in low-grade metamorphosed vesicular basalts and diabases, as well as in glaucophane schist and greywacke. Localities include Michigan and California in the United States, Scotland, England, Norway, Germany, Austria, the Czech Republic, Italy, Japan, and the South Island of New Zealand.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pumpellyite-(Mg).pdf

Formula
Ca2MgAl2(SiO4)(Si2O7)(OH)2┬ĚH2
Crystal System
Monoclinic 
Crystal Habit
Spherical, Fibrous, Massive - Lamellar 
Cleavage
Good, Good, None 
Luster
Vitreous (Glassy) 
Color
blue green, olive green, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
5.5 
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Pumpellyite-(Mg) from Deere Island, Novato, Marin Co., California, United States

Pumpellyite-(Mg)
            from Deere Island, Novato, Marin Co., California, United States

Greenish, flattened, prismatic crystals to 3mm.

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