page_title: Essexite
hierarchical_section_title: Essexite
caption_attribution_description: English: Craigleith. A small island off the East Lothian coast, Craigleith lies near the mouth of mouth of the Firth of Forth 1 mile north of North Berwick harbour. It rises to 24m and was purchased by Sir Hew Dalrymple from North Berwick Town Council in 1814. Craigleith is noted for its seabirds, including cormorants, shag, guillemot and puffins. Geologically, Craigleith is a laccolith, a dome-shape igneous intrusion, composed of essexite. View of the south of the island from a safety boat for North Berwick Regatta.
context_page_description: Essexite, also called nepheline monzogabbro, is a dark gray or black holocrystalline plutonic igneous rock. Its name is derived from the type locality in Essex County, Massachusetts, in the United States.
  Modern petrology identifies rocks according to mineralogical criteria. Utilising the IUGS QAPF diagram of Streckeisen "essexite" is more formally known as nepheline monzodiorite or nepheline monzogabbro depending on the ratio of orthoclase to plagioclase and the abundance of nepheline.
context_section_description: Essexite ( /ˈɛsəkˌsaɪt/), also called nepheline monzogabbro (/ˈnɛfəˌlɪn ˌmɒnzoʊˈɡæbroʊ, -ˌliːn-/), is a dark gray or black holocrystalline plutonic igneous rock. Its name is derived from the type locality in Essex County, Massachusetts, in the United States.
  Modern petrology identifies rocks according to mineralogical criteria. Utilising the IUGS QAPF diagram of Streckeisen (1974) "essexite" is more formally known as nepheline monzodiorite or nepheline monzogabbro depending on the ratio of orthoclase to plagioclase and the abundance of nepheline.
caption: Craigleith, an island in Scotland, composed of essexite
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