Mica (silicates): Phlogopite
Diagnostic card.
K Mg 3 (F, OH) 2 Al Si 3 O 10
Singonia monoclinic
Hardness 2-2,5
Specific weight 2.75-2.97
Cleavage is very good
Fracture leafy, flexible
Color from light yellow to pinkish brown
Color in powder white
Glitter pearl, glass
Phlogopite has a light yellow, greenish or pinkish brown color, perfect cleavage, characteristic for micas, glass shine, tending to pearl on the cleavage planes. Phlogopite is magnesian mica, very similar in appearance to biotite.
It crystallizes in the form of lamellas of pseudohexagonal outlines, which are sometimes combined into bundles of rather large sizes. Chemical composition. Potassium oxide (K2O) 7.0-10.3%, magnesium oxide (MgO) 21.4-29.4%, alumina (Al2O3) 10.8-17%, silica (SiO2) 38.7-45 %, Water (H2O) 0.3-6.4%, fluorine (F) up to 6%; Impurities: oxides of iron, barium, sodium, manganese, calcium, chromium, nickel.
The shape of the crystals. Tablit, short-prismatic. Crystal structure. Layered lattice. Class of symmetry. Prismatic - 2 / m. Cleavage. Very perfect in terms of the basis (001). Aggregates. Dense, scaly.
Diagnostic signs.
Suitable for concentrated sulfuric acid; The melting point is about 1330 ° C. The behavior in acids. It decomposes in hot H2SO4. Colorless, silvery, gray, white, light yellow, brown, dark brown.
Origin.
The typical location of phlogopite is contact-metamorphosed limestones.
Deposits and applications.
The finest crystals of enormous sizes are found in some places in Canada and Madagascar. Due to its refractoriness and excellent insulating properties, phlogopite is widely used in engineering as an electrically insulating material. The powdered phlogopite is used to make explosives, refractories, ceramics, etc.
Pegmatite vein with large crystals of phlogopite. Kotui, Siberia, the Russian Federation (CIS).
At the Odikhintch, the industrial deposit of mica-phlogopite was explored, 2014.
A large diopside is an amphibole-phlogopite vein. A small adit is broken through the vein (7.5 m).
The tunnel is punched through a large (3 m thick) diopside-phlogopite vein. Zonal, central
The zone is coarse-grained, the edges are fine-grained and contain a lot of light blue amphibole.
Expressed green altered basaltic separations (slope) - metamorphite
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Poisonous and radioactive dangerous stones and minerals
** - poisonous stones and minerals (mandatory check in the chemical laboratory + explicit indication of toxicity)
** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
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