page_title: Phlogopite
section_title: Ultrapotassic association
hierarchical_section_title: Phlogopite / Paragenesis / Ultrapotassic association
caption_attribution_description: Phlogopite bearing peridotite. Location: Finero, Ivrea zone, Italian Alps. Collection of the Université de Neuchâtel. Coin of 1 Swiss franc (diameter 23,20 mm) for scale.
context_page_description: Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica.
  Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg₃AlSi₃O₁₀(F, OH)₂. Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. For physical and optical identification, it shares most of the characteristic properties of biotite.
context_section_description: Phlogopite mica is a commonly known phenocryst and groundmass phase within ultrapotassic igneous rocks such as lamprophyre, kimberlite, lamproite, and other deeply sourced ultramafic or high-magnesian melts. In this association phlogopite can form well preserved megacrystic plates to 10 cm, and is present as the primary groundmass mineral, or in association with pargasite amphibole, olivine, and pyroxene. Phlogopite in this association is a primary igneous mineral present because of the depth of melting and high vapor pressures.
caption: Phlogopite bearing peridotite from Finero, Italy. Coin of 1 Swiss franc (diameter 23 mm) for scale. The phlogopites are the glittering minerals surrounded by the green groundmass of olivine.
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