i 8 The Eev. S. Haughton's Notes on Mineralogy. 



101-17 



No formula has been proposed by Dana for Glaueonite ; but 

 it is evident that the preceding analysis gives very exactly the 

 formula (I.) found from Mr. Hislop's mineral. I propose to 

 give the name of Hislopitc to the remarkable combination of 

 Calc-spar and Glaueonite found by him at Nagpur : the tvi^o mi- 

 nerals mutually penetrate each other, the calc-spar giving a form 

 to the whole, and constitute together a beautiful example of 

 the mineralogical law to which attention has been directed by 

 M. Gages. 



No. 5. Doleritic lava, with amygdaloidal geodes and cavities, 

 invariably lined with obsidian in a thin glazed pellicle, and 

 occasionally filled up with tabular crystals of calc-spar. Lo- 

 cality : Sitavalli Hill. 



Var. a. Dolerite, partly amygdaloidal ; cavities lined with green 

 earth, and sometimes filled with calc-spar in Hat crystals. 

 Same locality. 



No. 6. Calc-spar, curiously striated ; the lines of growth not 

 being perpendicular to the optic axis, but formed by planes 

 parallel to one of the edges of the obtuse trihedral angle of 

 the rhombohedron, and intercepting equal portions on the 

 other two edges of that angle. Locality : Takli. 



No. 7. Specimen of quartz rock from the Weiragad Diamond 

 Mines. Deposited by the action of water. 



No. 8. Graphic or letter-granite, composed of cream-coloured 

 felspar and watery quartz. Locality : City of Nagpur. 



No. 9. Coarsely crystalline granite, composed of — 



1. Quartz of watery lustre. 



2. Himteriie. White felspathic mineral of fatty lustre, 

 softer than felspar, but gritty under the agate pestle. 



3. Pink fcls])ar, in large tabular crystals (1 in. by ^ in.), 

 with brilliant reflexion. 



The white felspathic mineral contained in this granite ap- 



