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quartzite

quartzite

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Quartzite is a metamorphic rock mainly composed of quartz (with a quartz content greater than 85%), formed by metamorphic processes of quartz sandstone and siliceous rocks. It is generally formed by regional metamorphism and recrystallization of quartz sandstone or other siliceous rocks. It is also possible that siliceous rocks near magma undergo thermal contact metamorphism to form quartzite. Common colors include green, gray, yellow, brown, orange red, white, blue, purple, red, etc.

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Pyroclastic is a porous, light pyroclastic rock formed by rapid cooling after the eruption of basaltic magma. Black, dark gray or brown (depending on the degree of oxidation). Rich in pores (bubbles), loose texture, low density. Basalt, containing pyroxene, plagioclase and other dark minerals.
Pyrolusite with limonite inclusions

Pyrolusite with limonite inclusions

Pyrolusite (pyrolusite), the composition of manganese dioxide, is a common manganese mineral. Pyrolusite containing 63.19% manganese is an important manganese ore. Pyrolusite is very soft, its color is light gray to black, with a metallic luster. Pyrolusite is generally massive or kidney-like or earthy, sometimes with a radioactive fibrous morphology. Interestingly, some pyrolusite also exhibits a dendritic attachment to the rock surface, known as pseudoliths. Pyrolusite is other manganese ore into, in the swamps, lakes and other sediments can also form pyrolusite.
High Purity Peruvian Pyrite

High Purity Peruvian Pyrite

This pyrite is known for its brass-colored luster and distinctive striated surface. Pyrite derives its name from the Greek word pyr, which means fire, because it produces sparks when it collides with other minerals or metals. This pyrite is usually in the shape of a cube, with a highly glossy surface, giving a mirror-like visual effect. Not only are they of great value in mineralogical research, they are also favored by collectors and mineral lovers for their beautiful appearance.
Mica

Mica

Mica (mica) is a rock mineral, is made of potassium, aluminum, magnesium, iron, lithium and other layered structure of aluminum silicate. Its English name mica comes from the Latin micare, which means "shiny. In ancient China, mica was called "Tianpi" and "Dijin", and Tianpi Mountain, the origin of mica in Inner Mongolia, was named after it. Polytypic mica is prevalent, of which monoclinic is common, followed by trigonal, and the rest are rare. Mica is usually false hexagonal or rhombohedral plate, flake, columnar crystal form. The color varies with the change of chemical composition, mainly with the increase of Fe content. The characteristics are insulation and high temperature resistance.
Types of Garnet Minerals

Types of Garnet Minerals

This model summarizes the types of garnet group minerals, in which the aluminum garnet is usually red, and the calcium member is usually green. General formula: X, Y (SiO) X² = Mg², Ca², Fe², Mn², etc. Y³ = Al³, Fe³, Cr³, V³, etc. PyrAlSpites: aluminum garnet (Pyrope, Almandine, Spessartine) aluminum at the Y³. UGrAndites: Calcium at the X² locus of calcium garnet.
diorite

diorite

Diorite is a representative rock of neutral deep crystal rock, and it is also one of the main rock types in granite stone. It is mainly composed of plagioclase (medium-more feldspar) and one or several dark minerals, of which the total amount of dark minerals is generally about 20-35%. No or only a small amount of potassium feldspar, generally not more than 10% of the total feldspar. Does not contain or contains very little quartz, the amount of which does not exceed 5% of the total amount of light-colored minerals. Dark minerals are mainly amphibole, sometimes pyroxene and biotite. The accessory minerals are mainly apatite, magnetite, ilmenite and titanite.
synenite

synenite

It is a kind of magmatic rock, which belongs to neutral deep intrusive rock. light gray, with grainy, porphyritic structure. The content of silica (about 60%) and the diorite is quite, but the alkali (sodium oxide, potassium oxide) is slightly higher than the diorite. It is mainly composed of feldspar, hornblende and biotite, with no or very little quartz. Alkaline feldspar (usually orthoclase, microcline, striated feldspar) accounts for more than 70% of the feldspar. It is often a small rock strain, which forms a complex with basic rocks and alkaline rocks.
The orthostone of the alkaline massif

The orthostone of the alkaline massif

Syenite is a kind of magmatic rock, which belongs to neutral deep intrusive rock. light gray, with grainy, porphyritic structure. The content of silica (about 60%) and the diorite is quite, but the alkali (sodium oxide, potassium oxide) is slightly higher than the diorite. It is mainly composed of feldspar, hornblende and biotite, with no or very little quartz. Alkaline feldspar (usually orthoclase, microcline, striated feldspar) accounts for more than 70% of the feldspar. It is often a small rock strain, which forms a complex with basic rocks and alkaline rocks.
Syenite in alkaline rock mass

Syenite in alkaline rock mass

Syenite is a kind of magmatic rock, which belongs to neutral deep intrusive rock. light gray, with grainy, porphyritic structure. The content of silica (about 60%) and the diorite is quite, but the alkali (sodium oxide, potassium oxide) is slightly higher than the diorite. It is mainly composed of feldspar, hornblende and biotite, with no or very little quartz. Alkaline feldspar (usually orthoclase, microcline, striated feldspar) accounts for more than 70% of the feldspar. It is often a small rock strain, which forms a complex with basic rocks and alkaline rocks.
Ore-bearing fibrous calcite

Ore-bearing fibrous calcite

Calcite is a calcium carbonate mineral, the most common natural calcium carbonate is it. Therefore, calcite is a widely distributed mineral. Calcite is a stable form of calcium carbonate under normal temperature and pressure, soft, white or gray or transparent, calcite crystal shape is varied, their aggregates can be a cluster of crystals, can also be granular, massive, fibrous, milky, earthy and so on. Knocking calcite can get a lot of square pieces, hence the name calcite.
spinel crystal

spinel crystal

Spinel (Spinel) is a beautiful and durable gem mineral, which usually occurs together with the marble parent rock (Marble matrix), forming a unique ore combination. The chemical composition of spinel is magnesium aluminum oxide (MgAl₂ Ogo), which has a variety of colors, from red, blue, green to colorless. Spinel crystals have a high degree of transparency and a bright color, usually in the shape of octahedra or rhombohedra.
silverite

silverite

Pyroxene ore is an ore containing metallic silver. The symbol of silver in the periodic table of chemical elements is Ag, and the atomic number is 47. It is a soft, white, shiny precious metal that occurs primarily in mineral form in nature, such as silver ore.
Quartz crystals of hydrothermal deposits

Quartz crystals of hydrothermal deposits

Quartz crystals from hydrothermal deposits are very important mineral specimens in geology. Quartz is a common mineral with the chemical composition of silicon dioxide (SiO₂), which is widely found in the earth's crust. In hydrothermal deposits, quartz crystals are usually precipitated from silicon-rich hydrothermal solutions under high temperature and high pressure conditions. These crystals can exhibit complex growth textures, such as oscillatory banded textures, mosaic textures, and concentric ring-banded textures. Quartz crystals often contain fluid inclusions, which can provide important information about the formation conditions of the deposit, such as temperature, pressure and fluid composition.
Polished Amethyst

Polished Amethyst

Polished amethyst is a popular gemstone specimen. Amethyst is a purple variety of quartz that ranges in color from light purple to dark purple and is determined primarily by the presence of iron and other trace elements. Quartz is a common mineral with the chemical composition of silicon dioxide (SiO₂), which is widely found in the earth's crust. Polished amethyst and quartz are often used in jewelry and ornaments because their luster and beautiful color make them very attractive.

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