WATSON AND WHERRY: PYROLUSITE FROM VIRGINIA 



553 



Chemically also the crystals and crystalline mineral correspond 

 to pyrolusite, as shown in analyses of carefully selected samples 

 of each given in columns I and II of table 1. There are given 

 for comparison in columns III and IV analyses of pyrolusite 

 crystals, and in column V "pseudomanganite"^ from India/ 



TABLE 1 

 Analyses of Pyrolusite Crystals and Pseudomanganite 



I. Pj^Tolusite crystals from Stockwood Realty Corporation's mine, 6 

 miles east of Woodstock, Shenandoah County, Virginia. S. D. 

 Gooch, analyst. 

 II. Crystalline fibrous pyrolusite from Stockwood Realty Corpora- 

 tion's mine, 6 miles east of Woodstock, Shenandoah County, 

 Virginia. S. D. Gooch, analyst. 



^ The name pseudomanganite was proposed by Termor (Memoirs Geol. Survey, 

 India 37: Pt. I, p. 85. 1909) for pyrolusite pseudomorphous after manganite, 

 that occupies both chemically and physically the interval between manganite 

 and pyrolusite. The important physical properties of the three minerals are 

 tabulated by Fermor on p. 86. 



■* For a description of the minerals and a discussion of the analyses, see Fer- 

 mor (Memoirs Geol. Survey India 37: Pt. I, pp. 78-86. 1909). 



5 Mostly AI2O3. 



^ By difference. 



" Average of three determinations. 



