Synonyms for pumpellyite or Related words with pumpellyite
Examples of "pumpellyite"
facies is a little higher in pressure and temperature than the zeolite facies. It is named for the minerals prehnite (a Ca-Al-phyllosilicate) and
(a sorosilicate). The prehnite-
is characterized by the mineral assemblages:
+ Chlorite + Albite = Glaucophane + Epidote + HO
is a group of closely related sorosilicate minerals:
occurs as amygdaloidal and fracture fillings in basaltic and gabbroic rocks in metamorphic terranes. It is an indicator mineral of the prehnite-
metamorphic facies. It is associated with chlorite, epidote, quartz, calcite and prehnite. It was first described in 1925 for occurrences in the Calumet mine, Houghton Co., Keweenaw Peninisula, Michigan and named for United States geologist, Raphael Pumpelly (1837–1923).
The zeolite facies is generally considered to be transitional between diagenetic processes which turn sediments into sedimentary rocks, and prehnite-
facies, which is a hallmark of subseafloor alteration of the oceanic crust around mid-ocean ridge spreading centres. The zeolite and prehnite-
facies are considered "burial metamorphism" as the processes of orogenic regional metamorphism are not required.
facies is a metamorphic facies typical of subseafloor alteration of the oceanic crust around mid-ocean ridge spreading centres.
Isle Royale greenstone (chlorastrolite, a form of
) is found here, as well as on the Upper Peninsula of Michigan. It is the official Michigan state gemstone.
In greater detail the greenschist facies is subdivided into subgreenschist, lower and upper greenschist. Lower temperatures are transitional with and overlap the prehnite-
facies and higher temperatures overlap with and include sub-amphibolite facies.
At paths up to 220–320 °C and below 4.5 kbars, subducting slabs may encounter the prehnite-
facies, characterized by the presence of the hydrous chlorite, prehnite, albite,
, tremolite, and epidote and the loss of the zeolites heulandite and laumonite. Actinolite may occur at higher grade. Aside from albite, these characteristic minerals are water bearing, and may contribute to mantle melting. These minerals are also vital in the formation of glaucophane, which is associated with blueschist facies. The onset of a low-pressure phase of lawsonite is the most significant marker of prehnite-
facies metamorphism. The occurrence of lawsonite is significant because lawsonite contains 11 wt.% HO which is released at higher grade and can initiate significant melting.
In rocks in subduction zones, that are transported to great depths in relatively low temperatures, rare types of metamorphic zones can develop. Two facies series are the Franciscan and Sanbagawa types. The rocks are characterized by prehnite-
, blueschist or eclogite facies minerals.
Though not a zeolite, prehnite is found associated with minerals such as datolite, calcite, apophyllite, stilbite, laumontite, heulandite etc. in veins and cavities of basaltic rocks, sometimes in granites, syenites, or gneisses. It is an indicator mineral of the prehnite-
Alteration not associated with the ore forming process may also be omnipresent both above and below the massive sulfide deposit. Typical alteration textures associated with devitrification of submarine volcanic rocks such as rhyolitic glasses, notably formation of spherulites, of perlite, lithophysae, and low-temperature prehnite-
facies sub-seafloor alteration is ubiquitous though often overprinted by later metamorphic events.
Dallasite is a breccia made of quartz, epidote, altered basalt and
. The stone dallasite is named after Dallas Road, Victoria, British Columbia. It is considered the unofficial stone of British Columbia’s capital city. Dallasite is found in Triassic volcanic rocks of Vancouver Island and is considered the third most important gem material in British Columbia.
crystallizes in the monoclinic-prismatic crystal system. It typically occurs as blue-green to olive green fibrous to lamellar masses. It is translucent and glassy with a Mohs hardness of 5.5 and a specific gravity of 3.2. It has refractive indices of n=1.674–1.748, n=1.675–1.754 and n=1.688–1.764.
Like almost all other Copper Country mines, the mineral sought was native copper. Some silver was said to have been recovered in the upper workings. Other minerals in the ore, but which had no economic importance include quartz, calcite, epidote,
, chlorite and feldspar.
The Victoria Mine is the name given to a series of copper mines located in Rockland Township, Ontonagon County, in Michigan’s Copper Country. It was near this location that a large piece of float copper, known as the Ontonagon Boulder, was found. The mine operated off and on from 1849 until its final closure in 1921. Most of the metal found there was low grade native copper from the Forest Lode. Quartz, epidote, calcite, prehnite, and
are also found in the rock.
Much of the formation is folded and faulted as consequence of the Andean orogeny. At Última Esperanza Province the formation metamorphosed first under Greenschist facies and then under prehnite-
facies conditions. Some rhyolites of Tobífera Formation were incorporated into Cordillera Darwin Metamorphic Complex. The incorporation of part of Tobífera Formation in the metamorphic complex was accompanied by deformation and metamorphism and occurred in the context of the Andean orogeny in the Cretaceous.
The southern edge of the Gulf of Saint-Malo between Tregor and Cancale shows the deformational structures of the Cadomian Orogeny. These are East-west to North East trending upright folding. Schistosity is developed parallel to the axial plane of the folds. Prehnite-
facies to mid-amphibolite facies have been produced by metamorphism. Movement was concentrated in shear belts such as at St Cast. The movement on the belts was sinistral and horizontal.
Chlorastrolite also known as "Isle Royale Greenstone," is a green or bluish green stone. Chlorastrolite has finely radiated or stellate masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a changeable luster. This chatoyancy can be subtranslucent to opaque. Cholorastrolite is a variety of
: Ca(Mg,Fe)Al(SiO)(SiO)(OH)·HO. Chlorastrolite was once thought to be an impure variety of prehnite or thomsonite.
Onshore Jotnian sediments at Gävle (Gävle sandstone) have an estimated maximum thickness of 900 metres. Along with the Dala sandstone the Gävle sandstone has been subject to low grade burial metamorphism of the
type, meaning they must once have been buried beneath several kilometres of sediments. Together with the Jotnian sediments of Nordingrå the Gävle sandstone share links with the Satakunta Jotnian rocks. Archaeological finds show that Gävle sandstone has been used as millstone in Lejstaån near Uppsala.
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