MINERAL VEINS. 507 



calcite and shot out tlivough all the cavities in broad plates of exti'eme 

 thinness. This was followed by an abundant deposition of quartz, both as 

 drusy surfaces and as pseudomorphs after calcite, and by barite. There 

 is also an abundance of a chocolate-colored tabular ({uartz, slaslied full of 

 fissures from which the blades of barite liave disappeared, wliich is a most 

 perfect pseudomorph after tlie jjcculiar talnilar form of calcite called arji'en- 

 tine, which occurs also on the otlier border of the great granite area. 



The quartz is followed by prehnite in broad surfaces of large crystals, 

 simple or slightly rosetted. The prehnite was followed by laumontite in 

 fine large crystals possessing the wholly peculiar form characteristic of this 

 mineral, but now represented only by hollow incrustation pseudomorphs in 

 albite, which latter appear as minute, limpid, very characteristic twins. The 

 Avliole forms thus a very peculiar but very clearly observed paragenesis. 



Russell. — ^lineral veins appear in the northwest part of Russell, show- 

 ing diaisy quartz and galena.^ Specimens are deposited in the Massachusetts 

 State Survey collection made by E. Hitchcock. 



Huntington. — Angel's mine, Norwich, now Huntington. Showing- 

 blende in large masses and a beautiful di'usy quartz pseudomorph after 

 barite and calcite,^ according to the specimens in the suiwey collection. 



•Cat. Agr. Museum, 1859. Kept. Agriculture Mass., Appendix, p. LXIX, No. XIX, 202, 203. 

 2 Loc. cit., 200, 201, 204-211. 



