ARENTE
CHAMBA CHARENTE-INFERIEURE
CHAMBAL CHARENTON-LE-PONT
CHAMBERLAIN, JOSEPH CHARES
CHAMBERLAIN, JOSHUA LAWRENCE CHARES
CHAMBERLAIN, SIR NEVILLE BOWLES CHARES
CHAMBERLAIN CHARGE
CHAMBERLAYNE, WILLIAM CHARGE D'AFFAIRES
CHAMBERS, EPHRAIM CHARGING ORDER
CHAMBERS, GEORGE CHARIBERT
CHAMBERS, ROBERT CHARIDEMUS
CHAMBERS, SIR WILLIAM CHARING CROSS

CERARGYRITE, a mineral species consisting of silver chloride; an
important ore of silver. The name cerargyrite is a Greek form (from
[Greek: keras], horn, and [Greek: argyros], silver) of the older name
hornsilver, which was used by K. Gesner as far back as 1565. The
chloro-bromide and bromide of silver were also included under this term
until they were distinguished chemically in 1841 and 1842, and described
under the names embolite and bromargyrite (or bromyrite) respectively;
the chloride then came to be distinguished as chlorargyrite, though the
name cerargyrite is often now applied to this alone. Chloro-bromo-iodide
of silver has also been recognized as a mineral and called iodembolite.
All these are strikingly alike in appearance and general characters,
differing essentially only in chemical composition, and it would seem
better to reserve the name cerargyrite for the whole group, using the
names chlorargyrite (AgCl), embolite (Ag(Cl, Bl)), bromargyrite (AgBr)
and iodembolite (Ag(Cl, Br, I)) for the different isomorphous members of
the group. They are cubic in crystallization, with the cube and the
octahedron as prominent forms, but crystals are small and usually
indistinct; there is no cleavage. They are soft (H = 2-1/2) and sectile
to a high degree, being readily cut with a knife like horn. With their
resinous to adamantine lustre and their translucency they also present
somewhat the appearance of horn; hence the name hornsilver. The colour
varies somewhat with the chemical composition, being grey or colourless
in chlorargyrite, greenish-grey in embolite and bromargyrite, and
greenish-yellow to orange-yellow in iodembolite. On exposure to light
the colour quickly darkens. The specific gravity also varies with the
composition: for the pure chloride it is 5.55, and the highest recorded
for an iodembolite is 6.3.

The hornsilvers all occur under similar conditions and are often
associated together;