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Pyroxene Group XYZ2O6 - MIT OpenCourseWare

Hand sample: Displays good cleavage and will have a brown, greenish-brown to black color. Can only be distinguished from other pyroxenes by optical tests. -Augite- (Mg, Fe, Ca, Al) 2(Si,Al)2O6 – Thin section: Plane light – Colorless, grey, pale green, pale brown, or brownish green. (again, darker colors corresponding to higher Fe content).

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Introduction and Definitions Chemical Classification ...

Cleavage is the tendency of minerals to break parallel to crystallographic planes along which chemical bonds are weaker than others. Cleavage surfaces are not necessarily parallel to crystal faces. It may be difficult to distinguish between cleavage planes and crystal faces. University of Georgia

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Mineral & Rock ID

Cleavage - breakage along planes of atomic weakness. Calcite contains carbonate ion, will react with 5% HCl to produce CO 2. Calcite will react very quickly [CaCO 3],Dolomite [CaMgCO 3) 2] will react much more slowly - heat acid or powder the mineral to get the CO 2 production. Some minerals have magnetic properties, especially magnetite.

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Mineral Identification Chart – LECTURE

1 good cleavage plane. H=2. 1 cleavage plane. Translucent. Talc Mg3Si4O10(OH)2 1 2.7-2.8 White White, grey, pale green, or brown. Opaque. Greasy or silky luster. Shapeless masses (if no cleavage visible) or tabular. 1 poor cleavage plane (may not be visible). Feels greasy or soapy. H=1. Opaque.

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Mineral Identification Table

Hardness 6. Cleavage 2 planes at close to right angles, twinning striations. Streak white. Most igneous and metamorphic rocks; volcanic-derived sandstone. Sodium-rich varieties mined for use in ceramics. Potassium Feldspar (K,Al Silicate) Luster nonmetallic. Color varies white, cream, or pink. Hardness 6. Two directions of cleavage at right angles.

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Mineral Identification Tables

Sodium-rich varieties are white or light gray; calcium-rich varieties are medium to dark gray. Labradorite variety shows blue play of colors. Potassium feldspar. (Orthoclase, Microcline) 6. white, tan to orange, red, green, also colorless. colorless or white. vitreous or pearly. YES - 2 dir. at nearly 90 o.

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METALLIC LUSTER V, H Copper - Fillmore Central School

Pale yellow streak Dark brown to yellow brown color. H=3.5-4. S.G.=4. Resinous luster. Streak pale yellow. Six directions of cleavage, but seldom well developed. Powdered mineral (when streaked) smells like sulfur. I, S, H Sphalerite Pale green to dark green to black color. H=5.5-6. S.G.=3.3. Vitreous luster. Two directions of cleavage at 124°

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GeoMan's Mineral Identification: Non-metallic, H. >5.5

GeoMan's Mineral Identification. SP. GR. Crystals slender, fibrous. Often look like long, skinny rods. Commonly occur in cleavage fragments or granular masses. Typical lusters; vitreous to dull. HORNBLENDE is a common ferromagnesian mineral in intermediate silicate …

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Pink Colored Minerals - Mindat.org

Pink Minerals listed by color, luster, and streak. 307 Pink Minerals Sorted By Color, Luster, and Streak Color

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Orthopyroxene Page

Low birefringence, first order colors. Parallel extinction in longitudinal sections, pale pink to green pleochroism. Approximatly 90º cleavage planes. Thin irregular and wavy lamellae common. Occurrence: Orthopyroxene high in Mg is common in gabbro and peridotite groups.

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Basics--Minerals Table - Wenatchee Valley College

Cleavage/Fracture Mineral Name; colorless: 7: conchoidal fracture: quartz: variable: 7: conchoidal fracture: chalcedony (chert, etc.) pink or white: 5 - 6: 2 planes at right angles: orthoclase (feldspar) white: 5 - 6: 2 planes at right angles: Na-plagioclase (feldspar) white to gray: 5 - …

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Identification Tables for Common Minerals in Thin Section

Identification Tables for Common Minerals in Thin Section ... angles are only given where minerals usually show a linear feature such as a cleavage and/or long crystal faces. For plagioclase feldspars (stippled) the extinction ... pale pink (pleochroic) 1.63-1.66 mod-high + 0 70-90, -ve low: up to white.

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Optical properties of Minerals under Plane Polarized Light ...

Only certain minerals exhibit twinkling. eg. Calcite 5. Cleavage The planes along which a mineral shows a tendency to split (planes of relative weakness) are known as cleavage planes. These planes can be observed as straight lines under the microscope. Cleavage angles help to identify the minerals. eg. Hornblende - 120degree cleavage sets.

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Mineral Identification Flashcards | Quizlet

Mineral Identification. Color white-cream pink. Hardness=6. Cleavage 2 planes at about 90 degrees. Color white-grey/red-reddish brown. Hardness=6-6.5. Cleavage 2 planes at …

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Mohs Hardness Scale Vitreous Luster, any color can occur ...

Cleavage planes at 56 and 124 degrees. Hornblende Cleavage Vitreous to dull luster, black to dark green. Tends to look "blocky" ... Usually pink. Hardness 6. Potassium Feldspar (K-Spar) Red-brown Streak Strong red- ... to pale green. May have slippery feel Chlorite Can Easily Scratch with Fingernail. Sometimes might have 3

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Cleavage Minerals - GEOS 1111L: Physical Geology Lab ...

A nonmetallic mineral that is grey, grey-green, white, or blue in color, has 2 perfect cleavage planes at 90° with one plane showing striations (a growth pattern that appears as thin grooves), and a hardness of 6.0. The iridescent blue variation is known as Labradorite. Click on image to see enlarged photo.

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Anorthoclase Mineral Physical - Optical Properties and ...

Anorthoclase minerals is member of the sodium- and potassium-rich feldspar group takes its name from the Greek word anorthos, which means "not straight"—a reference to its oblique cleavage.Anorthoclase is colorless, white, cream, pink, pale yellow, gray, or green. Its crystals are prismatic or tabular and are often multiply twinned.

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FOMS - Rhodonite - Franklin Mineral Information

Franklin rhodonite is pink, red, brownish red, and gray; Sterling Hill rhodonite is generally pale grayish pink, but bright pink material is known. The color has been the subject of much comment. Manning (1968) attributed it to Mn 2+ based on absorption spectra in the visible and near-ultraviolet regions.

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Orthopyroxene Page

Low birefringence, first order colors. Parallel extinction in longitudinal sections, pale pink to green pleochroism. Approximatly 90º cleavage planes. Thin irregular and wavy lamellae common . Occurrence. Orthopyroxene high in Mg is common in gabbro and peridotite. groups. Rich Fe is typically found in diorite, syenite and granite.

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How to Identify Common Minerals? - Geology In

Crystalline minerals are most often quartz. Quartz cluster. Quartz is an extremely common mineral, and its glittering or crystalline appearance catches the eye of many collectors. Quartz has a hardness of 7 on the Mohs scale, and demonstrates any type of fracture when broken, never the flat surface of cleavage.

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Mineral Properties - University of Wisconsin–Oshkosh

Non-metallic (Pink to white) Slightly harder than glass: 2 cleavages at about 90°; Striations not present; can be pink, white (sometimes green). Quartz: Non-metallic (any color) Harder than glass: Hexagonal crystals; No cleavage planes; Conchoidal Fracture; Hardness greater than glass (H=7 on Moh's scale). Muscovite: Non-metallic (gold-clear)

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04Lab Mineral Identification

6 No streak 2 cleavage planes at ~90° White, pale or dark gray, translucent to nearly opaque Dull to vitreous Plagioclase Feldspar 6 No streak 2 cleavage planes at ~90° Pink to white or gray, translucent to nearly opaque Dull to vitreous Potassium Feldspar (Orthoclase) 5 to 6 Green to black or no streak 2 cleavage planes at 60° and 120°

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Morganite : Mineral Information Page - MINERALMINERS.COM

Morganite mineral information page at mineralminers.com: your on-line link direct to the mines and lapidary shops for natural color morganite mineral specimens, crystals, gemstones, mineral spheres, and handcrafted morganite jewelry gift ideas. Also on this page is morganite mineral information including its physical properties and discussing its occurance, diagnostic features, uses, history ...

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Vitusite-(Ce) Na3(Ce La Nd)(PO4 2 - Handbook of Mineralogy

Vitusite-(Ce) Na3(Ce,La,Nd)(PO4)2 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Orthorhombic, pseudohexagonal. Point Group: mm2. Crystals prismatic, to

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Pyroxene Group Minerals | Properties, Occurrence and Uses

Low birefringence, first order colors. Parallel extinction in longitudinal sections, pale pink to green pleochroism. Approximatly 90º cleavage planes. Thin irregular and wavy lamellae common. Associated Minerals: Feldspars, clinopyroxene, garnet, biotite and hornblende. Editors: Elizabeth Thomas (2003), Andrea Gohl (2007) and Emma Hall (2013 ...

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Cleavage: Mineral Properties - The Mineral and Gemstone ...

If a mineral exhibits different cleavage on different crystal planes, there will be two cleavage indicators separated by a semi-colon (;). For example, if the cleavage of a mineral is written as 1,2;3,1, than it has perfect cleavage in two directions, and poor cleavage in one other direction.

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GEO143 Mineral Webpages - Forsterite

The cleavage runs in two directions at 90 degrees. The cleavage is indistinct and rarely noticed. The fracture is conchoidal, which is characterized by smooth, curving surface. (1)(12) Crystal Form: Its crystal form is orthorhombic, which means it has three planes that intersect at angles other than 90 degrees. The mineral can also be ...

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Mineral Identification Key - Table IIIA-1

Most of the Epidote group minerals may exhibit a second, poor, cleavage, but it is usually not seen. See also clinozoisite below. Perfect in one direction : 6½ to 7: Colorless to White, Grey, Pale-brown to Pale-yellow, more rarely Pale-blue to Pale-green

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striations on some cleavage planes Plagioclase Cleavage ...

white to gray; striations on good cleavage planes Feldspar Cleavage absent Conchoidal fracture; H=7; transparent to translucent; vitreous to waxy luster; 6-sided prismatic crystals in well-developed crystal form; colors often vary from colorless to white, pink, violet, or gray Quartz Softer than glass Cleavage prominent Perfect cubic cleavage; salty taste; colorless to white, soluble in water ...

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Solved Activity 2: Identifying Sediment Characteristics ...

Activity 2: Identifying Sediment Characteristics For the following questions, use the sediment images and descriptions below to identify the: 1. Sediment size name (e.g. gravel, fine sand, coarse sand, silt, clay, etc.) 2. Sorting 3. Rounding 4. Minerals present (These don't have to be perfect; just make good guesses based on the materials you ...

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PETTERDITE, THE Cr-DOMINANT ANALOGUE OF DUNDASITE, …

Cleavage is fair parallel to {100}, and possibly also parallel to {010}. Density could not be measured. Petterdite is biaxial negative, 1.704(5), ≈ 1.802, and 1.842(5). The 2Vcalc. is close to 62°, and the optical orientation is X = a, Y = b, Z = c, with pleochroism X = Y colorless to pale greyish pink, Z greyish pink. Chemical analysis by a ...

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Pyrope - Wikipedia

Garnets tend to be less strongly coloured than other silicate minerals in thin section, although pyrope may show a pale pinkish-purple hue in plane-polarized light. The lack of cleavage, commonly euhedral crystal morphology, and mineral associations should also …

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Orthoclase Feldspar – Scotland | Geology Superstore

Orthocalse feldspar mineral specimens from Strathpeffer, Ross-Shire, Scotland. It exhibits a very pale pink almost white colouration and details excellent cleavage planes with rhombic crystal forms, a common mineral found in granites and rhyolites, …

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