Agricola, Georgius
,
De re metallica
,
1912/1950
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<
chap
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<
pb
pagenum
="
72
"/>
<
p
type
="
main
">
<
s
>Lastly, the seams, which are the very finest stringers (
<
emph
type
="
italics
"/>
fibrae
<
emph.end
type
="
italics
"/>
), divide
<
lb
/>
the rock, and occur sometimes frequently, sometimes rarely. </
s
>
<
s
>From
<
lb
/>
whatever direction the vein comes, its seams always turn their heads
<
lb
/>
toward the light in the same direction. </
s
>
<
s
>But, while the seams usually run
<
lb
/>
from one point of the compass to another immediately opposite it, as
<
lb
/>
for instance, from east to west, if hard stringers divert them, it may
<
lb
/>
happen that these very seams, which before were running from east to
<
lb
/>
west, then contrariwise proceed from west to east, and the direction of
<
lb
/>
the rocks is thus inverted. </
s
>
<
s
>In such a case, the direction of the veins is
<
lb
/>
judged, not by the direction of the seams which occur rarely, but by those
<
lb
/>
which constantly recur.</
s
>
</
p
>
<
figure
number
="
40
"/>
<
p
type
="
caption
">
<
s
>A—SEAMS WHICH PROCEED FROM THE EAST. B—THE INVERSE.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>Both veins or stringers may be solid or drusy, or barren of minerals,
<
lb
/>
or pervious to water. </
s
>
<
s
>Solid veins contain no water and very little air. </
s
>
<
s
>The
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lb
/>
drusy veins rarely contain water; they often contain air. </
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>
<
s
>Those which
<
lb
/>
are barren of minerals often carry water. </
s
>
<
s
>Solid veins and stringers con
<
lb
/>
sist sometimes of hard materials, sometimes of soft, and sometimes of a
<
lb
/>
kind of medium between the two.</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
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