A. S. EaTde — Allanite Crystals from New Jersey. 437 



of them being common on the Franklin crystals. Later, 

 W. C. Brogger* has determined about the same faces on the 

 allanite crystals of southern Norway. 



In the drawings accompanying this paper are shown the 

 various combinations. They are all drawn from the indi- 

 vidual crystals, with the faces possessing the same relative 

 dimensions. 



Fig. 1 shows the simplest form, consisting merely of the 

 basal pinacoid (c)OP(OOl), the ortho-pinacoid («)oo Poo (100) 

 and the prism (m) ooP(HO). This simple combination rarely 

 occurs. 



Fig. 2 is a combination showing forms (e)— Poo (101), (d) — 

 P(lll), (n)+J?(lll) and (£)2Pob(201) in addition to those in 

 fig. 1. This crystal is the largest terminated one in the lot 

 examined and the angles were measured with a contact 

 goniometer. 



Fig. 3 shows a much more general combination. The forms 

 occurring are (c)OP(001), (a?)-£Pc»(102), (*) r P55(101), (a) 

 ooPc^(lOO), (d)-P(lll), (tt) + P(lll), (w)ooP2(210), (m)ooP 

 (110), (Z)2P55 (201) and (^)P56 (101). This combination is sim- 

 ilar to the one on the large allanite crystal from Moriah, N. Y., 

 described by E. S. Dana,f lacking only the clino-dome Poo (011). 





6. 





^ 



i/ 



« > 



V'J \ 



a 

 i 





pi ; | 





Fig. 4 shows the largest number of forms in combination. 

 All of the forms shown in fig. 3, withthe exception of — £P5o 

 (102) occur, and in addition (i)%P oo (102), and the rarer forms 

 (s)iP56 (103) and (w)-2P2(211). 



* W. C. Brogger, Mineralien der sudnorweg augitsyenits, Zeit. fur Krys., xvi, 

 95, 1890. 

 f E. S. Dana, Allanite, Min. Notes. This Journal, III, vol. xxvii, p. 479. 



