294 STATE BOARD OF AGRICULTURE. 



Name of rocks and mineral 75 per cent moisture 



Hornblend granite 020 



Hornblend basalt 020 



Hornblend gabbro 018 



Hydrolic limestone . 030 



Marble (dolomitic) 013 



Mica-schist 036 



Pegmatite 025 



Peridotite 042 



Quartzite 020 



Quartzite 022 



Quartzite (Baraboo) 012 



Scotch granite 032 



Shale 050 



Shale 050 



Siliceous dolomite 050 



Siliceous sandstone 030 



Syenite 035 



Syenite 024 



Apatite 022 



Amphibole 015 



Apophyllite 069 



Calcite 012 



Chrysolite 016 



Epidote 016 , 



GjTpsum 044 



Hematite 010 



Kaolinite Oil 



Limonite 010 



Oligoclase 020 



Orthoclase 010 



Prochlorite .017 



Pyroxene 030 



Quarts 008 



Serpentine 050 



Side rite 035 



Stilbite 008 



Talc 015 



Zircon 010 



The above data show very emphatically and conclusively that there is 

 not only a measurable but also an appreciable amount of material that goes 

 into solution very readily wh&n unleached powder of rocks and rock-forming 

 minerals is brought in contact with distilled water. It "will be seen that the 

 freezing point depression varies from 0.008° in quartz to 0.057° in ferrugi- 

 neous sandstone, to 0.069°C in apophyllite. The majority of the rocks 

 and minerals have a lowering of the freezing point above 0.020°C. These 

 depressions, it must be remembered were obtained when the ratio of powder 

 to water was 1 to 0.75 or at 75 per cent moisture content. At a considerably 

 lower moisture content the freezing point depression of all those rocks and 

 minerals which do not have a definite solubility or do not form a saturated 

 solution immediately, will be considerably greater. Thus, for instance, at 



