BAILEY. | Chemistry of Gypsum. Isp 
C PLASTER (Manufactured ) From Gear ioees 
idan ‘ : i Rhoades.** Tex.®? ‘ Colo.?! 
Silica and insoluble residue.............. 1.00 7.43 39.55 
fron and aluminum) oxides: 3.0.75 2......5. (0) B33 0.12 0.61 
Maonesiumurcanbonateanaaina cre sce ae 0.75 Trace. 0.54 
Calciumucanrbonateserei pee ee 1.50 5.07 5.79 
Calciumpsuliplatesneee ake: 88.50 78.66 46.99 
NVC TS a et Aa ails oni USA A i 8.00 8.49 6.42 
PING) Ger petameter oils (ithe Le aim ears ik Cia fy Ae 100.08 99.77 99.90 
_ The analyses of four other samples” of the material used at 
the Rhoades mill will be of interest : 
No. 1. No. 2. No. 3. No. 4. 
Silicarandainsoliublemesichtie aan nas cease Y @S. | IL WS 6.33 5). 14! 
lrongandyalimmmmumMmoxiGdeswereremn rane eo soll Oo) Lo tei¢/ 0,53 0.67 
(Obulkonito ia), Opec ke) 5 ates aie es as nee ea Wie ba eR 30.23 | 28.64 | 30.70 31.56 
IMisomesiamanom em Nay mas rne es se a coal ea es 0.88 0.48 0.42 0.53 
Sil hunickanhyelridenaeenaee eee cok eerie ee BIAS || SOHO | BA. 07 39.20 
Carbonidioxider(caleulated) ye. 4s. a ee 413 Bo WD 6.38 3. to33 
Naas GO arnt tein sg eee al Sohn RAs inate hiaiik, ately attra A Mote | IS.25 | 19.283 119) G5 
PRO Gall Sere ean ee Peete te Se MeN Ouiain Vecs tts 98°86) | 99. 8il|) 96.36) | 100.88 
No. 1 is the average of eight samples, taken from different 
parts of the bed and at depths of from 2% to 3% feet. 
- No. 2 is asample from a deposit on the opposite side of the 
small stream. 
No. 3 is a sample of material said by the manufacturer to 
be ‘‘material which does not make plaster of itself, but when 
mixed with the regular material acts as a retarder. 
No. 4 is a sample said to be ‘‘average crude dirt, as gen- 
erally used in manufacturing.’’ 
If the above constituents are combined as they probably exist 
in the material, the composition would be: 
Silicaran@snsolublemesiauem ele AOS i laleas 6.33 5), 14 
rongandyallimimumyoxiGes paneer heer eee 0.89 ILS 0.53 0.67 
MlaVerMeSiUKIN CEVOOMAIS cobudveododeassobanoase 1.76 1.00 0.88 od) 
Calcimmucarbonaterne me ee enn 7.39 7.80 |) 13.63 p78 
Galciumipslpliatey yee Oc now sd ths ee ee an a) GBuBel | BGG B),'7AL 66 . 64 
NAVEMBEE OS a! Get Sa UL ra a eee EL Se nt eR Ce U7 IS 5 IG) 283 19.95 
__ Totals es alee ag CRU ATS 8, Ballons aa UA ROR 98.86 | 99.81 | 96.36 | 100.88 
81. Analysis by Paul Wilkinson. 82. Analysis by P. F. Nishkian, Kansas City. 
83. Samples received from P. Wilkinson; analysis by Bailey and Stafford. 
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