Analcime (; from Ancient Greek ἀνάλκιμος (análkimos) 'not strong') or analcite is a white, gray, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi2O6 · H2O. Minor amounts of potassium and calcium substitute for sodium. A silver-bearing synthetic variety also exists (Ag-analcite). Analcime is usually classified as a zeolite mineral, but structurally and chemically it is more similar to the feldspathoids. Analcime is not classified as an isometric crystal, as although the crystal structure appears to be isometric, it is usually off only by a fraction of an angle. However, there are truly isometric samples of the mineral, which makes its classification even more difficult. Due to the differences between the samples being too slight, there's no merit from having multiple species names, so as a result analcime is a common example for minerals occurring in multiple crystal systems and space groups. It was first described by French geologist Déodat de Dolomieu, who called it zéolithe dure, meaning hard zeolite. It was found in lava in Cyclops, Italy. The mineral is IMA approved, and had been grandfathered, meaning the name analcime is believed to refer to a valid species til this day.
Gabbro is a phaneritic, mafic intrusive igneous rock formed from the slow cooling magma into a holocrystalline mass deep beneath the Earth's surface. Slow-cooling, coarse-grained gabbro is chemically equivalent to rapid-cooling, fine-grained basalt. Much of the Earth's oceanic crust is made of gabbro, formed at mid-ocean ridges. Gabbro is also found as plutons associated with continental volcanism. Due to its variant nature, the term gabbro may be applied loosely to a wide range of intrusive rocks, many of which are merely "gabbroic". By rough analogy, gabbro is to basalt as granite is to rhyolite.
Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica.
A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral forms, either due to early growth within a magma, or by post-emplacement recrystallization. Normally the term phenocryst is not used unless the crystals are directly observable, which is sometimes stated as greater than 0.5 mm (0.020 in) in diameter. Phenocrysts below this level, but still larger than the groundmass crystals, are termed microphenocrysts. Very large phenocrysts are termed megaphenocrysts. Some rocks contain both microphenocrysts and megaphenocrysts. In metamorphic rocks, crystals similar to phenocrysts are called porphyroblasts.
Komatiite is a type of ultramafic mantle-derived volcanic rock defined as having crystallised from a lava of at least 18 wt% magnesium oxide (MgO). It is classified as a 'picritic rock'. Komatiites have low silicon, potassium and aluminium, and high to extremely high magnesium content. Komatiite was named for its type locality along the Komati River in South Africa, and frequently displays spinifex texture composed of large dendritic plates of olivine and pyroxene.
Picrite basalt or picrobasalt is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts (20-50%) and black to dark brown pyroxene, mostly augite.
Dobrá is a municipality and village in Frýdek-Místek District in the Moravian-Silesian Region of the Czech Republic. It has about 3,200 inhabitants.
Chotěbuz is a municipality and village in Karviná District in the Moravian-Silesian Region of the Czech Republic. It has about 1,400 inhabitants. The municipality has a significant Polish minority.
Dolní Lutyně is a municipality and village in Karviná District in the Moravian-Silesian Region of the Czech Republic. It has about 5,300 inhabitants.
Mount Quincan is a volcanic mountain near Yungaburra on the Atherton Tableland in Far North Queensland, Australia.
Kamen is a dormant stratovolcano located in the southern part of Kamchatka Peninsula, Russia, flanked by Bezymianny and Kluchevskaya. It is the second highest volcano of Kamchatka and sits above a shield volcano next to its neighboring volcanos. While the proximity between Kamen and its neighbors are relatively close, the lavas produced by all of them is different.
Karviná District is a district in the Moravian-Silesian Region of the Czech Republic. Its capital is the city of Karviná, but the most populated city is Havířov.
Třanovice is a municipality and village in Frýdek-Místek District in the Moravian-Silesian Region of the Czech Republic. It has about 1,100 inhabitants. The municipality has a significant Polish minority.
Šenov is a town in Ostrava-City District in the Moravian-Silesian Region of the Czech Republic. It has about 6,600 inhabitants.
Bohemian Paradise is a Protected Landscape Area and a region in Bohemia in the Czech Republic. It was declared in 1955, as the first nature reserve in the country. At first, it was 95 square kilometres in area; today it is almost 182 km2. This area is in the north of Bohemia and north-eastward from the capital city Prague. Borders of the region are not clearly defined, but there are some towns which could demarcate rough borders, like Turnov, Jičín, and Mnichovo Hradiště.
Moravian-Silesian Foothills are foothills and a geomorphological mesoregion of the Czech Republic.
Karel Kula is a Czech local politician and former football player and manager. He played as a midfielder and was a general manager of MFK Karviná and FK Fotbal Třinec. In 2023, he became the mayor of Český Těšín.
Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava.
The composition of Mars covers the branch of the geology of Mars that describes the make-up of the planet Mars.
The Prospect dolerite intrusion, or Prospect intrusion, is a Jurassic picrite or dolerite laccolith that is situated in Sydney, New South Wales, Australia. Lying in the heart of Cumberland Plain, in the suburb of Pemulwuy, the intrusion is Sydney's largest body of igneous rock, rising to a height of 117 metres (384 ft) above sea level. The site is formed by an intrusion of dolerite rock into Ashfield Shale. At least seven different rock types occur in the intrusion.
