This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1896 Excerpt: ...through the rock; the common ore is cinnabar.
Native Amalgam is a rather rare mineral containing mercury and
silver, but in very varying amounts. Cinnabar. Mercury sulphide,
HgS. Cinnabar, the sulphide of mercury, and sometimes called
natural vermilion, is found in masses of a fine red color, and
sometimes also in small rhombohedral or prismatic crystals. The
hardness is 2 to 2.5, and the specific gravity is about 8, or above
that of metallic iron (7.8). The great weight of a specimen cannot
escape the observer and is a striking character; in some cases,
however, if the cinnabar is not a pure solid mass, but only
scattered through a light clayey gangue, the density of the whole
may be much lower than 8. The luster is adamantine and the color
bright cochinealred, sometimes becoming dull and dark; the streak
is scarlet; crystals are usually perfectly transparent. The formula
for mercury sulphide, HgS, gives the percentage composition:
Sulphur 13.8, mercury 86.2--100. If heated on charcoal, a piece of
pure cinnabar is volatilized entirely; if anything is left behind,
it is only the gangue. In the closed tube it is also sublimed
entire, but here it collects again in the cold part of the tube
above as a black ring of sulphide of mercury, which has the same
composition as the original mineral, for the chemist knows both a
black and a red sulphide. In the open tube, if heated very slowly,
so as to avoid forming a black ring--in other words, so as to give
the sulphur time to oxidize (go off as S03)--a ring of metallic
mercury is formed in the cold part of the tube (see also p. 148).
Cinnabar is mined at Almaden in Spain, Idria in Carniola, also at
New Almaden and other points in California, and less abundantly
elsewhere. COPPER. Copper is one of the most useful of ...
|Country of origin:
Edward Salisbury Dana
||246 x 189 x 5mm (L x W x T)
||Paperback - Trade
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