36 

 OLIVINE GROUP— Continued. 



Olivine.— continued. 



669 Detached crystals and grains. 

 Loc, -Vesuvius, eruption of 1794. 

 Obs., presented by Mr. G. C. Fox. 



670 Do. Detached crystals and grains. 

 Loc, Vesuvius. 

 Obs.., presented by Mr. E. C. Carne. 



671 Do. Light yellowish-green, in basalt. 

 IiOG., Isle of France. 



672 Do. Dark compact masses, in lava. 

 IjOc, Vesuvius. 

 Obs., presented by Mr. G. C. Fox. 



673 MoNTiCELLiTE. — Small crystals with Calcite. 

 Loc, Vesuvius. 



FELSPAR GROUP. 



674 Qrthoclase. — {Adularia.) — Beautiful transparent macles. 

 on slate. 



Loc, Tintagel. 



675 Do. (Do.) — Fine large crystal 



676 Do. (Do.) — Colorless cleavable fragments. 

 Loc, Ceylon. 



677 Do. (Do.) — Small macles on slate. 

 Loc, Tintagel. 



680 Do. {Saniditie or glassy Felspai'.) — Crystalline grains 



with Hornblende. 

 Loc, Vesuvius. 



678 Do. {Murchisonite.) — Pinkish and opalescent, on 

 triassic breccia. 



Loc, Dawlish. 



Obs., presented by Mr. J. H. Collins. 



683 Do. {Common Felspar) — Small greyish crystals, with 



Hornblende. 



Loc, Norway. 



