The book The Constitution of the Natural Silicates was written by author Frank Wigglesworth Clarke Here you can read free online of The Constitution of the Natural Silicates book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Constitution of the Natural Silicates a good or bad book?
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The latter considera- tion applies throughout the discussion. At the other end of the series we have the magnesian tourmaline from Pierrepont, New York, as analyzed by Riggs. The mixed molecules are nearly as follows : Al S iO 4 =FeH I Si0 4 E=FeH \Si0 4 Al B0 2 3 Al BO 3 =NaH x Si0 4 =Al-B0 2 Al SiO 4 =FeH \SiO 4 EEEFeH + / Si0 4 =MgH Al Si0 4 =MgH \Si0 4 =Al B0 2 2 Al BO 3 =NaH /SiO 4 = Al BO 2 Al Si0 4 =MgH /SiO 4 =MgH Al SiO 4 =MgH \Si0 4 =Al B0 2 5 Al BO 3 =Ca /SiO 4 = Al BO 2 Al Si0 4 =Mg...H \Si0 4 =MgH Found. Calculated. SiO 2 35. 61 35. 91 Ti0 2 55 B 2 O, 10. 15 10. 48 ALOo 25. 29 25. 44 FeoOo . 44 FeO 8. 19 8. 62 MffO 11. 07 11. 17 Ca g O 3. 31 2. 79 NaoO. 1. 51 1. 55 K 2 O . 20 H 2 O 3. 34 4. 04 F . 27 v 99. 93 100. 00 An interesting intermediate tourmaline is the black variety from Lost Valley, California, analyzed by Schaller. Its formula is that of a mixed crystal, as follows : Al SiO 4 ==Al \SiO 4 =Al BO, 2A1 B0 3 =Na 2 + 2 Al BO 3 = I I /oi0 4 Al BO 2 >SiO^=Al- Al SiO 4 =Al \Si0 4 =Al /Si0 4 = Al ^ S iO=FeH Al-SiO=MgH \Si0 4 =Al-B0 2 \Si0 4 =Al-B0 2 1 Al B0 3 =H 2 Si0 4 =Al B0 2 Al Si0 4 =MgH \Si0 4 =MgH Al Si0 4 =FeH 70 THE CONSTITUTION OF THE NATURAL SILICATES.
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