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Some quartz and mica is produced together with the feldspar.
Soapstone is quarried in several places round Trondhjem and
in Gudbrandsdalen, and the Cathedral of Trondhjem has been its
chief consumer. It seems as if the employment of soapstone for
building purposes is becoming more common, and this kind of
stone appears in some places in considerable quantities.
Roofing-slate is produced in Valdres where the slate is of a
pretty green colour, in Voss, Stjørdalen, in Gudbrandsdalen and
in several other places.
From early ages, millstones have been produced at Selbu.
Whetstone has also been quarried from time immemorial at
Eidsborg in Telemarken.
Hewn stone has been produced in Norway in increasing
quantities. The kinds of stones that are quarried are granite, syenite,
augite-syenite, gabbro and porphyry.
The most important quarries are situated near Fredrikshald,
Fredrikstad, Larvik and Drammen.
Limestone is quarried in several places, and considerable
quarries of it are found in the Silurian strata round Kristiania. Very
rich strata of marble occur in several places, chiefly in Nordland,
in Salten near Fauske. In the last-named place the quarries
are worked on a relatively large scale. The marble is chiefly
exported to Copenhagen. The Norwegian marble is partly calcite
marble and partly dolomite marble. It is white, bluish white or
grayish white, and it also occurs with red and black shadings.
There are close and coarse-grained varieties, and it takes a
glassy polish.
The dolomite marble is sometimes brittle. The lavers
occurring at Fauske are some six hundred feet thick and can be
followed for about ten miles. The output is therefore dependent only
on the demand.
Many minerals containing rare metals and earths occur in
Norway, for instance round the Langesund Fjord and Arendal.
These minerals are highly treasured in scientific collections, and
rare specimens from Fredriksvern, Brevik, Arendal and other places
are found in almost all collections of minerals.
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