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furnish suitable crystals for measurement with the goniometer. The very 
few crystals which have been measured were almost opaque and of very 
common tabular habit. While examining some specimens of this fluorite 
from lot 4, concession I, Madoc township, the writer’s attention was 
attracted by minute, almost fibrous, translucent crystals, which upon 
investigation were identified as barite. The habit of these acicular barite 
crystals is figured on page 20 (Figure 6). 
The following forms were identified : 
b(010), m(110), n(120), y(122), d(102), u{124), o(011). 
Figure 7. Orthographic and dinographie projections of barite from Madoc township, 
Hastings county, Ontario. 
Yellowish crystals of barite collected by A. T. McKinnon in the vicinity 
of the above locality were measured on the two-circle goniometer. These 
crystals of tabular habit under 2 mm. in diameter yielded the following 
forms (Figure 7). 
m(110), cCOOl), u(101), d{102), 1(104). 
