History of the Universe eBook. 398 pages, 300 illustrations only $2.99
ARGENTITE, a mineral which belongs to the galena group,
and is cubic silver sulphide (Ag2S). It is occasionally found as uneven
cubes and octahedra, but more often as dendritic or earthy
masses, with a blackish lead-grey colour and metallic lustre.
The cubic cleavage, which is so prominent a feature in galena,
is here present only in traces. The mineral is perfectly sectile
and has a shining streak; hardness 2.5, specific gravity 7.3. It
occurs in mineral veins, and when found in large masses, as in
Mexico and in the Comstock lode in Nevada, it forms an important
ore of silver. The mineral was mentioned so long ago
as 1529 by G. Agricola, but the name argentite (from the Lat.
argentum, “silver”) was not used till 1845 and is due to W.
von Haidinger. Old names for the species are Glaserz, silver-glance
and vitreous silver. A cupriferous variety, from Jalpa in
Tabasco, Mexico, is known as jalpaite. Acanthite is a supposed
dimorphous form, crystallizing in the orthorhombic system,
but it is probable that the crystals are really distorted crystals
(L. J. S.)
A few typographical errors have been corrected. They
appear in the text like this, and the
explanation will appear when the mouse pointer is moved over the marked
passage. Sections in Greek will yield a transliteration
when the pointer is moved over them, and words using diacritic characters in the
Latin Extended Additional block, which may not display in some fonts or browsers, will
display an unaccented version.
Links to other EB articles: Links to articles residing in other EB volumes will
be made available when the respective volumes are introduced online.
"A well-rounded treatment of a vast body of facts" only $2.99