
PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 509 
ALUMINOUS AMPHIBOLES. 
Magnesia Lime Amphibole. 
Edenite. 
(Ca Mg) (Si Al,). 
From Granular Limestone. 
9. In several of the small quarry-holes above Milltown, Glen Urquhart, 
edenite occurs in sheaf-like, or /asciculitic tufts, as they have been called by 
HITCHCOCK. 
The tufts are about half an inch in length, their fibres being very delicate, 
but perfectly rigid. The plumose tufts are arranged in every conceivable 
position to each other, branching out from centres which are frequently specks 
of pyrrhotite. They are invariably imbedded in the lime. 
Specimens possessed of this divergent fibrous structure are seen of two 
colours—pale green and slate blue; and the composition of these varieties is 
different. 
The immediately associated minerals are pyrrhotite and calcite. The 
mineral has somewhat of a soapy feeling when rubbed. 1°3 grammes of the 
green variety afforded— 
Silica, : : * 653 
From Alumina, . ‘001 
* 654 = 50: 307 
Alumina, . : : 5 teh aX) 
Ferric Oxide, . : $ °118 
Ferrous Oxide, . : 5 26 
Manganous Oxide, . ; *076 
Lime, : : : > 63 
Magnesia, : ; 2 120769 
Potash, . ; ; 3 $9) 
Soda, ; : ; oth to6 
Water, . ; ‘ pe sealee 
99 - 988 
Insoluble silica, 1-375 per cent. ; there was no fluorine ; possible impurity, 
calcite. 
VOL. XXVIII. PART II. 6 Q 
