Martha's Vineyard, Dukes Co., Massachusetts, USA

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Glauconite : K_0.08R¹_1.33 R²_0.67 [][Al_0.13Si_3.87O₁₀](OH)₂
	Martha's Vineyard, Dukes Co., Massachusetts, USA 6-cm wide specimen. S. Pavadore collection. P. Cristofono photo.
© 2008 Peter Cristofono	Photo ID: 157086 View Count: 206
Marcasite : FeS₂
	Martha's Vineyard, Dukes Co., Massachusetts, USA 6 cm wide specimen. S. Pavadore collection. P. Cristofono photo.
© 2008 Peter Cristofono	Photo ID: 157087 View Count: 115

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Martha's Vineyard, Dukes Co., Massachusetts, USA

Glauconite : K0.08R11.33 R20.67 [][Al0.13Si3.87O10](OH)2

Marcasite : FeS2

Glauconite : K_0.08R¹_1.33 R²_0.67 [][Al_0.13Si_3.87O₁₀](OH)₂

Marcasite : FeS₂