456 DESCRIPTIONS OF ROCKS. 



Essex, and Nelson counties, and elsewhere. Forms a small bed in the 

 Upper Silurian of Bernardston, Mass., and in Devonian, at Moose River, 

 in Nova Scotia. 



4. Menaccanyte. (Titanic Iron Ore). — Resembles massive 

 hematite, but consists chiefly of titanic iron (p. 178). Oc- 

 curs in the Archaean of Canada, as in the parish of St. Ur- 

 bain, at Bay St. Paul, where the bed is ninety feet thick. 



5. Franklinyte. — Resembles massive magnetite, but con- 

 sists of franklinite (p. 179), which differs from magnetite in 

 containing more or less zinc and manganese. 



Occurs at Mine Hill, in Hamburg, N. J., and also at Stirling Hill, in 

 the same region, constituting a bed of great thickness. It is mixed 

 •with zinc ores, zincite and willemite, besides other minerals, and asso- 

 ciated with granular limestone, in an Archaean region of hornblendic 

 and gneissoid rocks. 



For non-metamorphic kinds of iron ores, see under Hematite 

 (p. 176), Limonite (p. 181), and Siderite (p. 185). Beds of magne- 

 tite occur only in metamorphic regions. 



