found in Scotland. 



Kilpatrick Hills, — 



Prehnite after analcime, forms n; nV: figs. 13 and 14 

 Fig. 13. Fig. 14. 



45 



These pseudomorphs are white, but their interiors are some- 

 times hollow, the inner surfaces being ordinary botryoidal Prehnite 



Fig. 15. 



of a fine yellow colour 



Analcime after Laumonite, form PM, fig. 15 ; 

 also in a highly modified form, apparently 

 exmbur, but indistinct from the small size 

 of the crystals. 



These pseudomorphs are usually considered to 

 be analcime (variety sarcolite), and are sometimes 

 sold under the name of "Cluthalite;" I am of 

 opinion that they will prove to be Weissigite, a zeo- 

 litic or fused albite. No mineral at all answering 

 either in characters or composition to the cluthalite 

 of Thomson has of late years been found near the Clyde, though 

 both the above and theAVeissigite pseudomorphs have passed as such . 



Prehnite after Laumonite, form PM. 



Weissigite after Pi-ehnite (?) 



Steatite after natrolite. 



Green earth after calcite, form y o, fig. 16. 



Haddingtonshire, near Tantallan Castle, — 



Celestine in radiating tufts after some 

 mineral unknown ; ? natrolite. 



Edinburghshire. In Ratho quarry, — 



Pectolite after analcime, forms n; nV. 

 Barytes after analcime, form n P. 

 Steatite after barytes in tabular crystals. 

 Steatite after analcime, form n. 

 Steatite after radiated pectolite. 

 Ayrshire. At Landclfoot, — 

 Pectolite after .'^capolite. 



Fiff. 16. 



