Clarke and Diller—Topaz from Stoneham, Me. 881 
In the topaz there are many liquid inclusions (a, a, fig. 1) 
from which the bubble readily disappears upon heating; and 
these are usually arranged in planes extending in nearly the 
same direction as, and approximately parallel to the most com- 
Mon prismatic planes J and 7-2, Almost at right angles to 
these, as represented in fig. 1, are numerous fissures, (}, 4); 
ie f i 
the figure are filled with a finely foliated, micaceous mineral, 
whose physical and optical properties, as far as they can be 
observed, agree fully with those of the damourite which was 
Fig. 2. 
irregularly interwoven. he fact, as shown in fig. 2, that 
tween the mass of the pe and the damourite, there is an 
Am. Jour. Scr.—Tuirp Series, Vou. XXIX, No. 173.—May, 1886. 
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