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Gurasada agate

Gurasada agate is a beautiful mineral specimen from the Gurasada region of Romania. Agate is a ribbon-shaped chalcedony (a subspecies of quartz), the strips of which can be parallel or concentric. This agate is usually embedded in diabase, a fine to medium-grained intrusive igneous rock that is usually dark gray to black in color. This polished agate specimen measures 9 x 8.5 x 8cm and has a chemical composition of silicon dioxide (SiO₂).

Peruvian cubic pyrite

Peruvian pyrite is mainly produced in Peru's famous Huanzala mine. 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.

Muscle anatomy (3D microscopic structure diagram)

calcite

Calcite (Calcite) is a common calcium carbonate mineral with a chemical formula of CaCO. It is widely found in sedimentary rocks, metamorphic rocks and igneous rocks. Calcite has unique optical properties such as birefringence and birefringence. Veins usually form when calcite is intergrown with ore minerals. In these veins, calcite may be the main component, but may also contain other valuable ore minerals, such as pyrite, sphalerite, barite, etc. These ore minerals are usually formed in low temperature hydrothermal veins.

Cabin Creek Meteorite

The Cabin Creek meteorite is a well-known iron meteorite that landed in Arkansas, United States, in 1886. It belongs to Class IIIAB iron meteorites with a mass of about 48.5kg. The directional landing characteristics of this meteorite are very obvious, with different depths of air marks and flow lines on the surface, and it maintains a fixed flight orientation when passing through the atmosphere.

Basalt of the Canary Islands, Spain

Basalt is a volcanic magmatic rock with relatively low silicon content. The rock is usually dark black. This basalt has no visible crystals. Therefore, it is made of volcanic glass and microlith (crystals that cannot be distinguished by the naked eye).

fault breccia

Fault breccia is formed in the fault zone. They consist of angular rock fragments from rocks on either side of the fault. These angular detritus elements are usually surrounded by cements, usually calcite or siliceous, which are deposited in pores created by fragmentation caused by fault replay.

clinopyroxene

Pyroxene (pyroxene,augite) is a common single-chain silicate rock-forming mineral, which widely exists in igneous rocks and metamorphic rocks. The main framework is composed of silicon-oxygen molecular chains. The crystal structure is monoclinic or orthorhombic, and the main component is XY(Si,Al)2O6, where X represents calcium, sodium, magnesium and divalent iron, there are also some kinds of ions such as zinc, manganese and lithium. Y represents smaller ions such as chlorine, aluminum, trivalent iron, vanadium, scandium, etc.

Internal structure of pyramid (3D layered demonstration animation)

The volcanic bomb on Tenerife Island

The volcanic bomb from Tenerife is a type of igneous rock formed during volcanic eruptions. These volcanic bombs are formed by the cooling and solidification of molten magma in the air, usually with unique shapes and textures. During a volcanic eruption, molten magma ejected from the volcano is formed by flying and cooling in the air. These rock blocks undergo rapid cooling and solidification in the air before finally falling to the ground. Volcanic bombs come in various shapes and sizes, usually presenting streamlined, spindle shaped, or irregular shapes.

Uranium bearing igneous rock

Stein meteorite

The Stein meteorite fell on May 22, 1808, in the Moravian village of Stonarov (known as Stein in German) in today's Czech Republic. This type of meteorite is classified as part of the HED meteorite family, possibly from asteroid 4 Vesta, and belongs to the gabbro achondrite subgroup.

Sphalerite

There are various colors of sphalerite, including white, gray, yellow (yellow patterned stone), blue, green, pink, and brown, while the stripes are white. The zinc in the composition is sometimes replaced by iron or manganese, and occasionally by small amounts of magnesium, calcium, cadmium, copper, cobalt, or lead. Similar to most carbonate minerals, it dissolves in hydrochloric acid and produces bubbles. In the calcite group, sphalerite belongs to a type with high hardness and specific gravity. In nature, zinc containing minerals are mostly sphalerite, and the production of sphalerite is relatively much lower. In addition to extracting zinc, it can also be used as semi transparent green or green blue gemstone jewelry.

Human tracheal structure (3D medical model with annotations)

$Spiral fracture (medical pathology 3D model)$

Spiral fracture (medical pathology 3D model)

Layered cubic structure diagram of squamous tissue on the skin

Neutrophils (Microscopic 3D Schematic)

C ă limani sulfur

The large chunks of sulfur from the C ă limani open-pit mine in Romania are a mineral found in the C ă limani volcanic mountain range. This open-pit mine is located in Suceava County, Romania. It was once a large sulfur mine that began in 1969 and was closed from 1992 to 1995. The chemical formula of sulfur is S, and pure sulfur appears bright yellow. Pure sulfur is usually bright yellow, but its color may change due to impurities such as clay and selenium impurities, which can cause it to appear red, green, brown, or gray. The C ă limani open-pit mine is a volcanic sulfur deposit.

Celestite containing shiny pyrite

Lapis Lazuli with sparkling pyrite is a beautiful mineral combination mainly composed of lapis lazuli and pyrite. The chemical formula of lapis lazuli is (Na, Ca) ₈ (AlSiO ₄) ₆ (S, SO ₄, Cl) ₂, usually appearing dark blue, while pyrite is distributed in lapis lazuli with its golden yellow spots. lapis lazuli belongs to the equiaxed crystal system and usually exists in block form.

Blue crystal mineral under ultraviolet irradiation

Kyanite crystals on matrix are a common mineral combination commonly found in metamorphic rocks. Blue sapphire is an aluminosilicate mineral with unique blue or blue-green crystals, commonly used in gemstones and industrial applications. The chemical formula of kyanite is Al ₂ SiO ₅, with a color range from light blue to dark blue, sometimes appearing green or gray. The crystal is usually in the shape of long columns or blades, with obvious cleavage planes. Blue spar is usually formed in high-pressure and low-temperature metamorphic environments, commonly found in gneiss and schist.

Blue crystal

Kyanite crystals on matrix are a common mineral combination commonly found in metamorphic rocks. Blue sapphire is an aluminosilicate mineral with unique blue or blue-green crystals, commonly used in gemstones and industrial applications. The chemical formula of kyanite is Al ₂ SiO ₅, with a color range from light blue to dark blue, sometimes appearing green or gray. The crystal is usually in the shape of long columns or blades, with obvious cleavage planes. Blue spar is usually formed in high-pressure and low-temperature metamorphic environments, commonly found in gneiss and schist.

Krasnoyarsk meteorite

The Krasnojarsk meteorite is a famous type of stony iron meteorite, belonging to the Pallasite category. It was discovered in the Krasnoyarsk Krai of Russia in 1749. In 1749, local blacksmith Yakov Medvedev and mining foreman Yi Kai Metich discovered this meteorite about 145 miles south of Krasnoyarsk. In 1772, this meteorite was presented to scholar P.S. Pallas and was named after it.

Techereu Jade

Jasper from Techereu is a mineral discovered in the Bal ș a area of Hunedoara County, Romania. Jade is an opaque rock that can appear in almost any color, depending on the mineral composition of the original sediment or volcanic ash. In the Techereu region, jadeite mainly exists in the conglomerates of the Cretaceous period, forming multicolored jadeite.

$Pathological types of fractures$

Pathological types of fractures

Syenite in alkaline rock masses

It is a type of magmatic rock that belongs to neutral deep-seated intrusive rocks. Light gray, with equigranular and spotted structures. Its silica content (about 60%) is comparable to diorite, but its alkaline content (sodium oxide, potassium oxide) is slightly higher than diorite. It is mainly composed of feldspar, amphibole, and biotite, with little or no quartz. Alkaline feldspar (usually orthoclase, plagioclase, and plagioclase) accounts for over 70% of feldspar. Often appearing as small rock masses, it forms a complex with basic and alkaline rocks.

Silicified coral

Cerussite

The composition of white lead ore is lead carbonate, which is sometimes partially replaced by silver or chromium. It belongs to the carbonate, aragonite group, and orthorhombic crystal system, and reacts with dilute acid to produce carbon dioxide bubbles, containing 77.6% Pb. The crystal is in the form of a plate-like or pseudo hexagonal bipyramidal shape, and it is common to run through twin crystals. Generally, it is a dense block like aggregate, bell like emulsion, or soil like structure. White or light yellow, brown, and other colors. Diamond luster. Hardness of 3-3.5, density of 6.4-6.6. Bubbling when encountering hydrochloric acid. It is a secondary mineral of galena that has been oxidized on the surface. Usually used together with galena to extract lead or prepare various lead compounds

Layered cubic structure diagram of squamous epithelial tissue

Wurtzite

Wurtzite, also known as wurtzite, is a zinc and iron sulfide mineral with the chemical formula (Zn, Fe) S. It is a rare polymorphic form of sphalerite structure. The iron content changes by up to 8%. It is a homomorphic isomer of sphalerite. It appears in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite, barite, and pyrite, as well as in clay iron nodules at low temperatures.

White tailed sea eagle specimen

The White tailed Eagle, scientific name Haliaeetus albicilla, is a large raptor widely distributed in temperate Eurasia. They usually live near large open water bodies, such as coastal saltwater areas, inland freshwater lakes, wetlands, and rivers. The white tailed sea eagle is known for its strong hunting ability and opportunistic scavenging behavior, mainly preying on fish and waterbirds.

Weinsberg granite

Weinsberg granite is a type of granite named after the Weinsberg region in Germany. Usually appears gray or light pink with small black spots. Widely used in architecture and decoration, such as flooring, countertops, and monuments. It has a long history of use in architecture and sculpture, and is favored for its beauty and durability.