Chester, Hampden Co., Massachusetts, USA

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Clinochlore : (Mg,Fe²⁺)₅Al[(OH)₈\|AlSi₃O₁₀]
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA 7.2 x 3.5 x 2.7 cm. This specimen has a display face rich with embedded, flat-laying clinochlore crystals. A small bit of another purple mineral is associated. A very interesting historical deposit which, although it produced a lot of minerals, we apparently know very little about today now that it is long gone. From the noted collection of ...
© Rob Lavinsky	Photo ID: 199860 View Count: 104
Clinochlore : (Mg,Fe²⁺)₅Al[(OH)₈\|AlSi₃O₁₀], Clinochlore (Var: Corundophilite) : (Mg,Fe,Al)₆(Si,Al)₄O₁₀(OH)₈
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA A 3/4 inch thick by 1 1/2 x 2 inch specimen of prochlorite from Chester, Mass. in the Creekmur collection.
© Charles Creekmur	Photo ID: 232123 View Count: 31
Clinozoisite : {Ca₂}{Al₃}[O\|OH\|SiO₄\|Si₂O₇]
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA Field of View ~ 1.5 mm
© Scott Whittemore	Photo ID: 33515 View Count: 322
Clinozoisite : {Ca₂}{Al₃}[O\|OH\|SiO₄\|Si₂O₇]
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA Field of view ~ 2 mm
© Scott Whittemore	Photo ID: 33408 View Count: 243
Corundum : Al₂O₃
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA 11 mm corundum crystal in matrix. S. Pavadore collection. P. Cristofono photo.
© 2008 Peter Cristofono	Photo ID: 158873 View Count: 139
Diaspore : AlO(OH)
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA Harvard Mineralogical Museum specimen no. 99389. Label is about 5.5 cm long. P. Cristofono photo.
© 2007 Peter Cristofono	Photo ID: 98589 View Count: 328
Diaspore : AlO(OH)
	Old Mine, Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA Translucent crystals in box-work like formation. 7 cm field of view. S402-180 Photographer's specimen, deacquisitioned.
© 2008, JGW	Photo ID: 150325 View Count: 150
Diaspore : AlO(OH)
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA 10.0 x 4.8 x 1.9 cm. A classic aluminum-containing mineral species from a very old American locality that was so important it was mined up. The diaspore was one of the two chiefly sought after minerals at the site. The diaspore, when deeply violet colored, is superb. This specimen has some decent color to it. Note the flat-lying but clearly ...
© Rob Lavinsky	Photo ID: 202030 View Count: 87
Diaspore : AlO(OH)
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA 7.0 x 3.7 x 0.8 cm. Pearlescent, highly lustrous, diaspore plates in nifty juxtaposed angles on a thin crust of matrix form a very showy specimen on this old-time piece from the Chester Emery Mines of Massachusetts. Diaspore is an uncommon aluminum hydroxide and this is highly representative of the species and famous locale. The color is very good ...
© Rob Lavinsky	Photo ID: 203224 View Count: 82
Diaspore : AlO(OH)
	Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA Micro purple diaspore crystals. Field of view is about 3 mm across. Harvard Mineralogical Museum, no. 96520. P. Cristofono photo.
© 2009 Peter Cristofono	Photo ID: 223049 View Count: 62