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Tacharanite
Tacharanite is a calcium aluminium silicate hydrate (C-A-S-H) mineral of general chemical formula with some resemblance to the calcium silicate hydrate (C-S-H) mineral tobermorite. It is often found in mineral assemblage with zeolites and other hydrated calcium silicates. C-S-H and C-A-S-H mineral phases are important hydration products of cements but can also be found, although much less frequently, in natural conditions in particular geological environments. The natural specimens are rare and of small size (often available only in limited quantity) but often well crystallised while the hydrated cement phases are disordered and cryptocrystalline or amorphous with a poorly defined stoichiometry denoted by the use of dashes in the abreviations C-S-H and C-A-S-H. Etymology Tachanarite (pronunciation as ''tă·kherenait'': ) was named by Sweet ''et al.'' (1961) from the Gaelic word ''"tacharan"'', a changeling, ''"an object or a thing left in place of a thing stolen"'' alludi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyrolite
Gyrolite, NaCa16(Si23Al)O60(OH)8·14H2O, is a rare silicate mineral (basic sodium calcium silicate hydrate: N-C-S-H, in cement chemist notation) belonging to the class of phyllosilicates. Gyrolite is also often associated with zeolites. It is most commonly found as spherical or radial formations in hydrothermally altered basalt and basaltic tuffs. These formations can be glassy, dull or fibrous in appearance. Gyrolite is also known as ''centrallasite'', ''glimmer zeolite'' or ''gurolite''. Discovery and natural occurrence It was first described in 1851 for an occurrence at The Storr on the Isle of Skye, Scotland and is named from the ancient Greek word for circle, ''guros'' (γῦρος), based on the round form in which it is commonly found. Minerals associated with gyrolite include apophyllite, okenite and many of the other zeolites. Gyrolite is found in Scotland, Ireland; Italy, Faroe Islands, Greenland, India, Japan, USA, Canada and various other localities. Occurren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palagonia
Palagonia ( Sicilian: ''Palagunìa'', Latin: ''Palica'') is a ''comune'' (municipality) in the Metropolitan City of Catania in the Italian region Sicily, located about southeast of Palermo and about southwest of Catania. Palagonia borders the following municipalities: Lentini, Militello in Val di Catania, Mineo, Ramacca. Palagonia is well-known for the cultivation of oranges. The main catholic church is the Chiesa Madre San Pietro Apostolo. See also *Palagonia double homicide Palagonia ( Sicilian: ''Palagunìa'', Latin: ''Palica'') is a ''comune'' (municipality) in the Metropolitan City of Catania in the Italian region Sicily, located about southeast of Palermo and about southwest of Catania. Palagonia borders the ... References External links Official website [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolerite
Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). ''Diabase'' is the preferred name in North America, while ''dolerite'' is the preferred name in the rest of the English-speaking world, where sometimes the name ''diabase'' refers to altered dolerites and basalts. Some geologists prefer to avoid confusion by using the name ''microgabbro''. The name ''diabase'' comes from the French ', and ultimately from the Greek - meaning "act of crossing over, transition". Petrography Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set in a finer matrix of clinopyroxene, typically augite (20–29%), with minor olivine (3% up to 12% in olivine diabase), magnetite (2%), and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trotternish
Trotternish or Tròndairnis (Scottish Gaelic) is the northernmost peninsula of the Isle of Skye, in Scotland. Its most northerly point, Rubha Hùinis, is the most northerly point of Skye. One of the peninsula's better-known features is the Trotternish landslip, a massive landslide that runs almost the full length of the peninsula, some .Ordnance Survey ''Landranger'' 1:50000 Map. Sheet 23. North Skye, Dunvegan & Portree. The landslip contains two of Skye's most famous landmarks: the Old Man of Storr, an isolated rocky pinnacle, and the Quiraing, an area of dramatic and unusual rock formations. The summit of The Storr, on whose slopes the Old Man of Storr is located, is the highest point of the peninsula. The north-eastern part of the peninsula around Quiraing is designated as a National Scenic Area and the entire landslip is a Special Area of Conservation. Dinosaur footprints have been found at ''An Corran'', which is also a Mesolithic hunter-gatherer site dating to the 7th m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portree
Portree (; gd, Port Rìgh, ) is the largest town on, and capital of, the Isle of Skye in the Inner Hebrides of Scotland. Murray, W.H. (1966) ''The Hebrides''. London. Heinemann. Pages 154-155. It is the location for the only secondary school on the island, Portree High School. Public transport services are limited to buses. Portree has a harbour, fringed by cliffs, with a pier designed by Thomas Telford. Attractions in the town include the Aros centre which celebrates the island's Gaelic heritage. Further arts provision is made through arts organisation ATLAS Arts, a Creative Scotland regularly-funded organisation. The town also serves as a centre for tourists exploring the island.Haswell-Smith, Hamish. (2004) ''The Scottish Islands''. Edinburgh. Canongate. Pages 173-4 Around 939 people (37.72% of the population) can speak Scottish Gaelic. The A855 road leads north out of the town, passing through villages such as Achachork, Staffin and passes the rocky landscape of the Sto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parent Rock
In the earth sciences, parent rock, also sometimes ''substratum'', is the original rock from which younger rock or soil is formed. In soil formation the parent rock (or parent material) normally has a large influence on the nature of the resulting soil; for example, clay soil is derived from mudstone while sandy soil comes from the weathering of sandstones. Parent rock can be sedimentary, igneous or metamorphic. In the context of metamorphic rocks, the parent rock (or protolith) is the original rock before metamorphism occurred. See also *Bedrock *Regolith Regolith () is a blanket of unconsolidated, loose, heterogeneous superficial deposits covering solid rock. It includes dust, broken rocks, and other related materials and is present on Earth, the Moon, Mars, some asteroids, and other terrestria ... References Petrology Regolith {{geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vein (geology)
In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. The hydraulic flow involved is usually due to hydrothermal circulation. Veins are classically thought of as being the ones in the body not the rock veins and arteries planar fractures in rocks, with the crystal growth occurring normal to the walls of the cavity, and the crystal protruding into open space. This certainly is the method for the formation of some veins. However, it is rare in geology for significant open space to remain open in large volumes of rock, especially several kilometers below the surface. Thus, there are two main mechanisms considered likely for the formation of veins: ''open-space filling'' and ''crack-seal growth''. Open space filling Open space filling is the hallmark of epithermal vein systems, such as a stockwork, in greisens or in cert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intrusive Rock
Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form ''Igneous intrusion, intrusions'', such as batholiths, dike (geology), dikes, Sill (geology), sills, laccoliths, and volcanic necks.Intrusive RocksIntrusive rocks accessdate: March 27, 2017.Igneous intrusive rocks, accessdate: March 27, 2017.Britannica.comintrusive rock , geology , Britannica.com accessdate: March 27, 2017. Intrusion is one of the two ways igneous rock can form. The other is extrusive rock, extrusion, such as a Types of volcanic eruptions, volcanic eruption or similar event. An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an ''extrusion'' consists of extrusive rock, formed above the surface of the crust. Some geologists use the term plutonic rock synonymously with intrusive rock, but other geologists subdivide intrusive rock, by crystal size, into coarse-grai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vesicular Texture
Vesicular texture is a volcanic rock texture characterized by a rock being pitted with many cavities (known as vesicles) at its surface and inside. This texture is common in aphanitic, or glassy, igneous rocks that have come to the surface of the earth, a process known as extrusion. As magma rises to the surface the pressure on it decreases. When this happens gasses dissolved in the magma are able to come out of solution, forming gas bubbles (the cavities) inside it. When the magma finally reaches the surface as lava and cools, the rock solidifies around the gas bubbles and traps them inside, preserving them as holes filled with gas called vesicles. A related texture is amygdaloidal in which the volcanic rock, usually basalt or andesite, has cavities, or vesicles, that are filled with secondary minerals, such as zeolites, calcite, quartz, or chalcedony. Individual cavity fillings are termed amygdules (American usage) or amygdales (British usage). Sometimes these can be source ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroxide
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. It functions as a base, a ligand, a nucleophile, and a catalyst. The hydroxide ion forms salts, some of which dissociate in aqueous solution, liberating solvated hydroxide ions. Sodium hydroxide is a multi-million-ton per annum commodity chemical. The corresponding electrically neutral compound HO• is the hydroxyl radical. The corresponding covalently bound group –OH of atoms is the hydroxy group. Both the hydroxide ion and hydroxy group are nucleophiles and can act as catalysts in organic chemistry. Many inorganic substances which bear the word ''hydroxide'' in their names are not ionic compounds of the hydroxide ion, but covalent compounds which contain hydroxy groups. Hydroxide ion The hydroxide ion is a natural par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxygen
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula . Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides.Atkins, P.; Jones, L.; Laverman, L. (2016).''Chemical Principles'', 7th edition. Freeman. Many major classes of organic molecules in living organisms contain oxygen atoms, such as proteins, nucleic acids, carbohydrates, and fats, as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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