_To Calculate the Weight of a Measured Volume of Mineral or
Rock._--Multiply the cubic feet by 62.4 and then multiply by the sp. g.
of the stuff, the answer gives the weight in pounds. For example, 100
cubic feet of quartz weighs 100?62.4?2.6 = 16,224 lbs. The weight of any
mass of mineral of known extent and sp. g. is ascertained in this way.
The following table gives the specific gravities of some of the commoner
minerals.
Barytes 4.5
Blende 4.0
Calcite 2.6
Cassiterite 6.9
Chalybite 3.8
Copper pyrites 4.2
Fluor 3.1
Galena 7.5
H?matite 5.0
Mispickel 6.2
Pyrites 5.0
Quartz 2.6
FOOTNOTES:
[8] The difference of 20 or 30 milligrams is disregarded here because it
detracts equally from the actual weight of the water and liquid to be
determined. If the liquid is a heavy one the difference shows itself in
the third or second place of decimals. The correction may be made by
deducting from the weight of the flask 0.0012 grams for each gram of
water it holds.
PART II.--THE METALS.
CHAPTER IX.
SILVER, GOLD, CYANIDES, PLATINUM, MERCURY.
SILVER.
Silver is widely diffused, and has been found in most mining districts.
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