parting (redirected from partings)

parting

In metallurgy, the separation of gold and silver by chemical or electrochemical means. Gold and silver are often extracted together from the same ores or recovered as by-products from the extraction of other metals. A solid mixture of the two, known as bullion or doré, can be parted by boiling in nitric acid. The silver is dissolved as silver nitrate, leaving a gold residue that is filtered off and washed; silver is precipitated out of solution by adding ferrous sulfate. This is the traditional method used in assaying the content of gold and silver samples.

---

parting

Chem a division of a crystal along a plane that is not a cleavage plane

---

parting [′pärd·iŋ]

(geology)

A bed or bank of waste material dividing mineral veins or beds.

A soft, thin sedimentary layer following a surface of separation between thicker strata of different lithology.

A surface along which a hard rock can be readily separated or is naturally divided into layers.

(metallurgy)

Recovery of gold (or occasionally another metal) from its alloys by a corrosion process.

Zone of separation between cope and drag portions of mold or flask in sand casting.

In sand molding, a composition to facilitate removal of the pattern.

A shearing operation to produce two or more parts from a stamping.

(mineralogy)

Fracturing a mineral along planes weakened by deformation or twinning.