Definition

Noun: 1. A specific mineral: A naturally occurring inorganic solid, composed primarily of lead chlorophosphate (Pb₅(PO₄)₃Cl). It is characterized by its crystal structure (hexagonal system), often forming barrel-shaped or prismatic crystals, and its range of colors, which can be green, yellow, brown, or orange. It is a secondary mineral, meaning it forms from the alteration of primary lead minerals.

Examples of Usage

• Noun:
  • The museum's collection features a stunning specimen of green pyromorphite from Cornwall.
  • Mineralogists study pyromorphite for its distinctive crystal habits.
  • Although not a major ore, pyromorphite is considered a minor source of lead.

Advanced Usage

• In mineralogy and geology: The term is used precisely to identify a mineral with a specific chemical composition and crystal structure. It is often discussed in the context of oxidation zones of lead deposits.
  • The presence of pyromorphite indicates the weathering of primary galena in the deposit.

Variants and Related Words

• Green lead ore: An archaic, descriptive name for pyromorphite, referring to its common green color and lead content.
• Mimetite: A related mineral in the apatite group, where arsenate (AsO₄) replaces the phosphate (PO₄) found in pyromorphite.

Synonyms

• Mineral: (general category)
• Lead chlorophosphate: (chemical description)

Notes on Meaning

The word pyromorphite has a single, highly specific scientific meaning. It is not used in everyday language and does not have idiomatic or phrasal verb uses. Its definition is fixed within the fields of mineralogy, geology, and chemistry.

Noun

1. a mineral consisting of lead chloride and phosphate; a minor source of lead