REPROD OHe DEED DRE CHO RT TO22 IAI 
sixteen have been observed, while it ought to be possible to find 
interfacial angles with nearly every value between 1° and 179°, 
though, as a matter of fact angles of 20° 30’ and 170° show the 
extremes that have been found. 
For purposes of study and collection it has been found that 
these boxes are most readily separated from the vein where the 
work of ground water solution has been most active, causing the 
loss of the carbonate filler, thereby leaving the hollow quartz 
form easily removable. 
Because of the polyhedral shape of these boxes, it has been sup- 
posed that they are pseudomorphs but after measuring and 
assembling all the interfacial angles of some twenty-two typical 
examples it was found aside from the facts that they had as few 
faces as seven and as many as sixteen and a great variety of inter- 
facial angles, there was no constancy of interfacial angle. Some 
of the results, as found by the goniometrical measurements of 
the interfacial angles, are as follows: 
Interfacial Angle No. of Recurrences 
90° SOM ee ee ee ORNS Leite, Lute ars Shoterg 8 
162 ARERR ee Ao hs to Wile log it ete aera fetal of (ok sersiemelettcl teh Sirehicl lon aloha oWeuane 5 
eo 
Lo 30" 60000000 F000d0000 Gb DOOD ODOC DO DODD OUD OD dUE 
oe (0 
Il ORR R EM: Se IOS panes OAS SOLE, AEST Se. 
128° oN ; 
beet oraipenielymen) qavapnpaiwn wluurds aily gt 
22 interfacial angles from 
48° 3204, to 
RG IE” Oak es a Secale eek a a, AR EAs Ba tC fed 3 
33 eth be ia to 
1A aN Rate ANA RSs AULD Uibuny bet tcu tM lol sienlstartor Sis) eyopenti acevo us on 2 
56 2 OMNES OA LO 
LOMA PRET HOR een rey OT Ee tL MLO OL EL Toe I 
Furthermore these boxes appear to lack any degree of sym- 
metry except where intersecting plates have made right angles, simu- 
lating isometric, tetragonal or orthorhombic crystals. 
It would seem, therefore, from a study of these results that the 
boxes could hardly be pseudomorphous after some former min- 
eral but must be due the cellular structure formed by quartz- 
filled fractures and their many and varied angular intersections. 
Evidence and Kind of Movement 
In the vein there are apparent three quite distinct structures 
which show evidence of at least two sorts of movement. In one 
of these the plates or bands of carbonate and quartz observe a 
