Epidote is a calcium aluminium iron sorosilicate mineral, Ca2(Al, Fe)3(SiO4)3(OH), crystallizing in the monoclinic system. Calcium (ˈkælsiəm is the Chemical element with the symbol Ca and Atomic number 20 WikipediaNaming Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 The silicate minerals make up the largest and most important class of rock-forming Minerals They are classified based on the structure of their silicate Ion group A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating In Crystallography, the monoclinic Crystal system is one of the 7 lattice Point groups A crystal system is described by three vectors. Well-developed crystals are of frequent occurrence: they are commonly prismatic in habit, the direction of elongation being perpendicular to the single plane of symmetry. The faces are often deeply striated and crystals are often twinned. Many of the characters of the mineral vary with the amount of iron present for instance, the color, the optical constants, and the specific gravity (3. 33). The hardness is 6. 5. The color is green, grey, brown or nearly black, but usually a characteristic shade of yellowish-green or pistachio-green. Displays strong pleochroism, the pleochroic colors being usually green, yellow and brown. Clinozoisite is white or pale rose-red variety containing very little iron, thus having the same chemical composition as the orthorhombic mineral zoisite. Clinozoisite is a mineral a complex Sorosilicate of Calcium and Aluminium and is usually a grey green colour In Crystallography, the orthorhombic Crystal system is one of the seven Lattice Point groups Orthorhombic lattices result from stretching This article is about the mineral named zoisite For the Sailor Moon character see Shitennou.
Epidote is an abundant rock-forming mineral, but one of secondary origin. It occurs in crystalline limestones and schistose rocks of metamorphic origin. Limestone is a Sedimentary rock composed largely of the Mineral Calcite ( Calcium carbonate: CaCO3 The schists form a group of medium-grade Metamorphic rocks chiefly notable for the preponderance of lamellar Minerals such as Micas chlorite Metamorphic rock is the result of the transformation of an existing rock type the protolith, in a process called Metamorphism, which means "change It is also a product of hydrothermal alteration of various minerals (feldspars, micas, pyroxenes, amphiboles, garnets, and others) composing igneous rocks. Hydrothermal circulation in its most general sense is the circulation of hot water 'hydros' in the Greek meaning water and 'thermos' meaning heat Feldspar is the name of a group of rock-forming Minerals which make up as much as 60% of the Earth 's crust. The word "mica" is thought to be derived from the Latin word la micare, "glitteren" in reference to the brilliant appearance of this mineral (especially The pyroxenes are a group of important rock-forming Silicate minerals found in many Igneous and metamorphic rocks. Amphibole (pronounced amfi-bowl defines an important group of generally dark-colored rock-forming inosilicate Minerals composed of double chain SiO4 The garnet group includes a group of minerals that have been used since the Bronze Age as gemstones and abrasives Igneous rocks (etymology from Latin ignis, fire are rocks formed by solidification of cooled Magma (molten rock A rock composed of quartz and epidote is known as epidosite. Quartz (from German) is the most abundant Mineral in the Earth 's Continental crust (although Feldspar is more common in Epidosite (ɨˈpɪdəsaɪt is a highly altered Epidote and Quartz bearing rock Well-developed crystals are found at many localities: Knappenwand, near the Großvenediger in the Untersulzbachthal in Salzburg, as magnificent, dark green crystals of long prismatic habit in cavities in epidote schist, with asbestos, adularia, calcite, and apatite; the Ala valley and Traversella in Piedmont; Arendal in Norway; Le Bourg-d'Oisans in Dauphiné; Haddam in Connecticut; Prince of Wales Island in Alaska, here as large, dark green, tabular crystals with copper ores in metamorphosed limestone. Großvenediger is generally considered to be Austria's fourth highest Mountain (although it can be up to sixteenth if every subsidiary summit is counted Asbestos is a group of Minerals with long thin fibrous Crystals The word "asbestos" (῾ἀσβεστος is derived from a Greek adjective Adularia is a tectosilicate mineral with formula K[[aluminum Al]] Si 3 O 8 Calcite is a carbonate mineral and the most stable polymorph of Calcium carbonate ( Ca[[carbon C]] O 3 Norway ( Norwegian: Norge ( Bokmål) or Noreg ( Nynorsk) officially the Kingdom of Norway, is a Constitutional Le Bourg-d'Oisans is a town and commune in the Isère département, in south-eastern France. The Dauphiné or Dauphiné Viennois is a former province in southeastern France, roughly corresponding to the present departments ' of the Connecticut ( is a state located in the New England region of the northeastern United States of America. Alaska ( Аляска Alyaska) is a state in the United States of America, in the northwest of the North American continent Copper (ˈkɒpɚ is a Chemical element with the symbol Cu (cuprum and Atomic number 29 An ore is a volume of rock containing components or Minerals in a mode of occurrence that renders it valuable for mining
The perfectly transparent, dark green crystals from the Knappenwand and from Brazil have occasionally been cut as gemstones. |utc_offset = -2 to -4 |time_zone_DST = BRST |utc_offset_DST = -2 to -5 |cctld
Belonging to the same isomorphous group with epidote are the species piemontite and allanite, which may be described as manganese and cerium epidotes respectively. Piemontite is a Sorosilicate Mineral in the Monoclinic Crystal system with the chemical formula {Ca2}{Al2Mn3+} Allanite is a sorosilicate group of minerals within the broader Epidote group that contain a significant amount of Rare earth elements It has the general Manganese (ˈmæŋgəniːz is a Chemical element, designated by the symbol Mn. Cerium (ˈsɪəriəm is a Chemical element with the symbol Ce and Atomic number 58
Piemontite occurs as small, reddish-black, monoclinic crystals in the manganese mines at San Marcel, near Ivrea in Piedmont, and in crystalline schists at several places in Japan. For a topic outline on this subject see List of basic Japan topics. The purple color of the Egyptian porfido rosso antico is due to the presence of this mineral. This article is about the country of Egypt For a topic outline on this subject see List of basic Egypt topics.
Allanite has the same general epidote formula and contains metals of the cerium group. In external appearance it differs widely from epidote, being black or dark brown in color, pitchy in lustre, and opaque in the mass; further, there is little or no cleavage, and well-developed crystals are rare. The crystallographic and optical characters are similar to those of epidote; the pleochroism is strong with reddish-, yellowish-, and greenish-brown colors. Although not a common mineral, allanite is of fairly wide distribution as a primary accessory constituent of many crystalline rocks, gneiss, granite, syenite, rhyolite, andesite, and others. Gneiss (ˈnaɪs is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from preexisting formations that were originally Granite (ˈɡrænɪt is a common and widely occurring type of intrusive, Felsic, igneous rock. Syenite is a coarse-grained intrusive Igneous rock of the same general composition as Granite but with the Quartz either absent or present in relatively This page is about a volcanic rock For the ghost town see Rhyolite Nevada, and for the satellite system see Rhyolite/Aquacade. For the extinct cephalopod genus see Andesites. Andesite (ˈændəsaɪt is an igneous, Volcanic rock, of intermediate It was first found in the granite of east Greenland and described by Thomas Allan in 1808, after whom the species was named. Greenland (Kalaallit Nunaat meaning "Land of the Greenlanders" Grønland is a self-governing Danish Province located between the Year 1808 ( MDCCCVIII) was a Leap year starting on Friday (link will display the full calendar of the Gregorian calendar (or a Leap year Allanite is a mineral readily altered by hydration, becoming optically isotropic and amorphous: for this reason several varieties have been distinguished, and many different names applied. An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Orthite was the name given by Jöns Berzelius in 1818 to a hydrated form found as slender prismatic crystals, sometimes a foot in length, at Finbo, near Falun in Sweden. Friherre Jöns Jacob Berzelius (20 August 1779 &ndash 7 August 1848 was a Swedish chemist Year 1818 ( MDCCCXVIII) was a Common year starting on Thursday (link will display the full calendar of the Gregorian Calendar (or a Common "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. . hardness: 6-7 density:3. 25-3. 45 luster: vitreous color:pistachio green to yellowish-green streak: white
References
- This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain. The Encyclopædia Britannica Eleventh Edition (1910–1911 is a 29-volume reference work that marked the beginning of the Encyclopædia Britannica The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone
External links
Dictionary
epidote
-noun
- Any of a class of mixed calcium iron aluminium sorosilicates found in metamorphic rocks
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