Mineralpedia Details for Phlogopite

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Phlogopite

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.

Formula: KMg₃(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Micaceous, Scaly, Lamellar
Cleavage: Perfect, None, None
Luster: Vitreous - Pearly
Color: brown, gray, green, yellow, reddish brown
Streak: white
Class: Monoclinic - Prismatic
Fracture: Uneven
Hardness: 2-2.5
WebMineral: View Phlogopite
Mindat: View Phlogopite

Phlogopite from Headley mine, Old Chelsea, Quebec, Canada

Excellent cone shaped crystal 2x3cm with Calcite.

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Phlogopite from Iron mine, Kovdor Massif, Kola Peninsula, Russia

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.

Nice green crystal plate 4cm

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Phlogopite from Balmat, St. Lawrence Co., New York, United States

Phyllosilicate - Monoclinic - Mica group member. End member. Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.

Scaly mass with individual crystals to 1cm.

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Phlogopite from Palabora mine, Phalaborwa, Limpopo, South Africa

Golden to golden brown micaceous Phlogopite.

Phlogopite is the Manganese end member of Biotite-Phlogopite series. It is a Phyllosilicate - Monoclinic - Mica group member. Phlogopite is classified as an ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

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Phlogopite with Anthophyllite from Heřmanov, Žďár nad Sázavou dist., Vysočina, Czech Republic

Special Info: Type Locality

An interesting round nodule which at the center is a ellipsoidal mass of golden brown Phlogopite encased in tannish bladed and columnar Anthophyllite.

Phlogopite is the Mg end member of Biotite-Phlogopite series. It is a Phyllosilicate - Monoclinic - Mica group member. Phologpite is classified as an Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.