minerals in fractures. _uacct = "UA-3067463-1"; VEIN/FRACTURE FILLING Chlorite. function printSpecial() MINERAL NAME Plagioclase. 6a). Found inside – Page B-19The mineral identification is based on a low - intensity , sharp , 10 - A X - ray diffraction peak , and the mica is listed in figure 2 as a ... Chlorite also lines fractures and cavities at scattered locations in the drill core . Epidote may have simple twinning, and can occur with quartz and various hydrous minerals like chlorite and sericite. Most of the dredge hauls were positioned on the … Talc is so soft that it feels slippery. Espa�ol var headTags = document.getElementsByTagName("head"); Fracture: Lamellar. html += printReadyElem.innerHTML; A - Atoms On/Off Mineral Identification Table Minerals for This Lab and Some Physical Properties They Possess. Cleavage planes are distinguished from fracture by being smooth and often having reflective surfaces. cleavage or fracture: halite. Help on Above, Brown B E , Bailey S W , American Mineralogist , 48 (1963) p.42-61, Chlorite polytypism: II. Iron oxide minerals. Help on Above, Hanscom R , American Mineralogist , 65 (1980) p.534-539, The structure of triclinic chloritoid and chloritoid polymorphism. Chlorites of detrital and diagenetic origins are also found in significant amounts in sedimentary rocks. Their color, as the name implies, is various shadings of gray. Description Mineral; Cleavage: colorless, green or purple, glassy, 4 good cleavage planes, harder than penny (H=4) Fluorite: black to brown, one perfect cleavage plane (basal), thin flexible sheets, same hardness as fingernail (H=2.5) var html = '\n\n'; If a mineral exhibits no cleavage, cleavage is said to be absent; in these cases the mineral is said to have fracture. Clinopyroxene(?). Gneiss Granite/rhyolite, shale B, R, S High Grains medium to coarse; li ght and dark minerals segregated into bands. Saponite, Corrensite and Chlorite-Saponite Mixed-Layers in the Sancerre-Couy Deep Drill-Hole (France) - Volume 29 Issue 1 biotite, chlorite or muscovite) has one cleavage plane, feldspar (e.g. Location: Drandorf Fundgrube Mine, Bockau, Schwarzenberg District, Erzgebirge, Saxony, Germany. if (printReadyElem != null) } Small-scale fractures with no evidence of displacement are filled with carbonates, chlorite, iron oxides, epidote, and sulphides, and faults visible at the core scale are filled with drusy quartz (euhedral quartz crystals as coatings on or infillings in fractures), carbonates, barite, and clay minerals. Streak: White, light green or light brown. 467-526. Also an example of vitreous or glassy luster. Massive - Fibrous - Distinctly fibrous fine-grained forms. ESS 210 Lab 4: Mineral Identification 2 Mineral Properties for 22 of the Common Rock-Forming Minerals Hardness Streak Color Cleavage and Fracture Mineral Color, Specific Gravity, etc. { Pseudo Hexagonal - Crystals show a hexagonal outline. if (document.getElementsByTagName != null) Chlorite minerals, found in a great variety of rocks and geological environments, display a wide range of chemical compositions and a variety of polytypes, which reflect the physicochemical conditions under which they formed. Conchoidal 2.6 6-sided crystals and granular masses. alert("Sorry, the print ready feature is only available in modern browsers. Sheets: micas, chlorite, clay minerals Framework: feldspars and quartz. Chlorite. Cleavage - The tendency of a mineral to break along flat planar surfaces as determined by the structure of its crystal lattice. Brown B E , Bailey S W , American Mineralogist , 48 (1963) p.42-61, Chlorite polytypism: II. Mineral in metamorphic rocks (and rare igneous rocks) Formation Environment: High grade metamorphism of minerals in mudstone, granite, or basalt Description: Nonmetallic luster. What one physical property do they share in common ? html += '\n\n\n'; The Chlorite Group of minerals is a band of mostly monoclinic phyllosilicate that is micaceous that includes Amesite, Chamosite, Clinochlore (Kämmererite and Seraphinite) and Cookeite among others. Scale: 6 x 4.5 cm. Platy Quartz is a mineral with crystalline structure, but there are no planes of weakness inside the crystal. Pronunciation: KLORE•ite (accent on capitalized syllable) Color: green Luster: pearly Diaphaneity: translucent; may appear opaque in hand specimen Hardness: 2-2.5 Specific gravity: 2.6-3.3 Cleavage/fracture: 1 Description of Fracture- 1 good, 2 poor Cleavages (rarely seen in our samples) Additional Notes- fibrous (silky) in appearance. Cleavage and fracture describe different ways in which a mineral can break. Red, brown, yellowish-green, black color Complex 7 None None. Chelyabinsk, Urals, Russia. Fracture is lamellar. Mineral equilibrium and fluid inclusion studies indicate potassic alteration occurred at <6 km and 300–350 °C (Parry et al., 1991; Parry & Bruhn, 1990). The main inorganic reduc-tants are Fe(II)-containing minerals: biotite in the bedrock, and pyrite and chlorite in the fracture filling minerals as well as in the buffer and backfill. Precipitation occurred during reactivation of Proterozoic fractures, but formation of new fractures is also inferred, possibly due to far-field effects of the Caledonian orogeny, or elevated hydrostatic pressure due to its foreland basin. else P - Polyhedra On/Off It also found in amygdules, fractures in altered volcanic rocks, hydrothermal vein deposits and soils. (Mg,Fe)3(OH)6. • … Chlorite can also occur as a result of hydrothermal alteration of any rock type, where recrystallization of clay minerals or alteration of mafic minerals produce chlorite. • Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London. Kaolin and Serpentine Group Minerals. chlorite, illite and smectite) and compared with the mineral definitions as specified in the geothermal SIP. Most chlorites are green but it has a foliate presence. Chlorite Mineral. 2nd Ed. printWin.print(); It also found in amygdules, fractures in altered volcanic rocks, hydrothermal vein deposits and soils. Width of sample from Cyprus 7 cm. orthoclase or plagioclase) has two which intersect at 90°, and amphibole (e.g. Chlorite is an important constituent of many contact and regional metamorphic rocks of low to medium grade, usually with temperatures of to 400°C and pressures up to a few Kb. Specific Mineral-4-6.5 - 7 None None. Colour streak- White. Found inside – Page 126Premineral fractures partly bound some stopes ; locally these fractures are veined and ribboned with sulfide and ... this function of foliation is shown clearly by the orientation and growth of the chlorite in the fractures in the ... { Aggregates can be scaly, compact, platy and as crusts. { ... cleavage or fracture: hematite (nonmetallic & metallic) cleavage. Imperfect - Produces planes that are not smooth, e.g. 2. Found inside – Page 49Shattered garnet grains are commonly altered to chlorite + quartz + magnetite or white mica + quartz + chlorite ( fig . 2C ) . ... Secondary chlorite occurs as crystal clots that replace primary minerals along fractures . SECONDARY MINERAL NAME Actinolite. Found inside – Page B-13The secondary minerals are chiefly chlorite , sericite , epidote , and carbonate minerals . A sample of granite from outcrops a short ... Much of the Dedham Granodiorite is cut by small shear fractures , some of which are slickensided . Olivine ACCESSORY MINERAL NAME Iron oxide minerals. The Bakken Formation underlies much of eastern Montana, North Dakota and Saskatchewan, with correlative units extending in the subsurface beyond these regions. Chlorite. It is the diagnostic species of the zeolite facies and of lower greenschist facies. PERCENT PRESENT 55 1 0 « 1 PERCENT 19 20

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