PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 79 
A ‘‘chloritic mineral,” differing from this merely in a greater brightness of 
colour and lustre, occurs a little west of Portsoy. 
The average of Maricnac’s three analyses is appended for comparison. 
GLAUCONITE. 
1. Incompany with Dr Gorpon of Birnie, Professor Nicot, and Mr DupGEon, 
I found this mineral—new to Scotland—in a kind of cornstone quarry at Ash- 
grove, near Elgin. 
It occurs, along with a manganesian calcite and well-crystallised pyrite, 
acting as an occasional cement of the nodular masses of lime. It is a very soft 
and friable, somewhat dull-green powder ; rarely a bright light-green. 
1-32 grammes afforded— 
Silica, : . * 644 
From Alumina, - 004 
* 648 = 49:09 
Alumina, : 3 — :L5"206 
Ferric Oxide . é Ono Ge 
Ferrous Oxide, i : 3° 056 
Lime, .. : ‘ P rata | 
Magnesia. , , 2° 651 
Potash, . : " ; 6° 052 
Soda, : f 1° 205 
Water, . ‘ , ao UG 
100: 017 
Loses 6° 03 of the above water at 212°. It was readily decomposed by acids. 
Glauconite possibly occurs in some of the silurian limestones of Ayrshire. 
VOL, XXIX. PART I. Ex 
