106 THE UNIVERSITY OF OKLAHOMA 



present and that seepage of so'.ntion carrying barite took place with 

 concomitant crystal growth perpendicular to the walls of the cavity. 

 The e crytt:; r urt meet in the center, thus forming the radiate 

 structure observed, inasmuch as by geometry the radii of a sphere 

 are perpendicular to its surface (or tangents to the surface). 



This theory is further borne out by the actual existence of a 

 ferruginous hard shell found actually sun ounding barite v/ith radi- 

 ate structure giving rise to the geodes mentioned under 5a. This 

 shell is considered the lining of the cavity, which only needs to 

 be removed by water rolling, or other form of attrition to produce 

 the radiate form from the geode having a radiate internal struc- 

 ture. 



The writer has no theory to cover the reason why geodes some- 

 times have a radiate structure and sometimes have massive crystal- 

 line interiors though possib'y differences of temperatures, rapidity 

 of formation, or changed conditions, produced the difference ob- 

 served in the transition from 5a to 5b. It is probably most 

 plausible to assume that the radiate structure is developed when the 

 ruL^ ■,: crvfta. : ^wth exceeds the rate of seepage of the barite solu- 

 tion into the original cavity and the massive form, when the rate 

 of crystal growth exceeds the rate of seepage of barite solution into 

 the original cavity and the m.assive form, when the rate of crystal 

 growth is less than the rate of seepage. 



The flat lens-shaped radiate forms with the light greenish 

 color are said to occur in the Sylvan shale near White Mound in the 

 Arbuckle mountains. Since the writer has never seen these forms 

 in p'ace he is not in position to advance any theories as to then- 

 genesis. 



It is an interesting fact worthy of note that many times barite 

 is associated with copper ores and hematite and these in turn have 

 been shown to be connected in some instances with faulting; which 

 often is a very significant phenomenon. 



In the foregoing paper an attempt has been made to call atten- 

 tion to an interesting problem in the barite deposits of Oklahoma, 

 to lay a foundation for future work by summarizing the definite 

 accomplishmients already achieved along this line and to place on 

 record a few of the writer's observations, theories and analyses, 

 pertaining to these deposits.* 



*To iho^e ■v'pres^^'^ fiT'lr-r the writer recommends Meland's bibliography 

 in the thesis cited. Vide Supra. 



