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e.g. augite in PPL Colour: pale pink; Pleochroism: pale pink to pale pink-purple; Relief: moderate Cleavage One of the most difficult properties to see and understand. However, as cleavage is determined by the geometric configuration of atoms with the mineral, cleavage planes are always parallel straight lines while fractures are …
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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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Some images used in this set are licensed under the Creative Commons through Flickr. Click to see the original works with their full license. Study with Quizlet and …
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Study with Quizlet and memorize flashcards containing terms like Orthoclase Feldspar (K Feldspar), Plagioclase Feldspar (Na, Ca-Feldspar), Quartz and more.
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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 - 6: 2 planes at right angles:
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Minerals may have zero, one, two, three, four, or even more cleavages, but because thin sections provide a view of only one plane through a mineral grain, we rarely see more than three at a time. And minerals that have elongate habits exhibit different cleavage patterns when viewed in a cross section than they do when viewed in a …
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habit. It has perfect cleavage but is not always evident. Thin section: Plane light: Moderate to high positive relief in thin section. Colorless to pale brown in thin section. Weak pleochroism – colorless to pale yellow. Crossed polars: Biaxial, (+) or (-), 2V 65-90°(-) and 90-58°(+). Maximum interference colors are
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Furthermore, although crystal cleavage is relatively easy to test — by breaking a sample with a hammer — different minerals demonstrate a range of cleavage quality, such that …
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Minerals with a Nonmetallic Luster – Generally Dark-Colored (Continued) Cleavage Properties Comments and Uses Name and Composition Softer than Glass Yes Brown to yellowish-brown; H = 3.5–4.0; S.G. = 4.0; translucent; L = vitreous or resinous: 3 good cleavages not at 90°, powder may effervesce in HCl acid Has been used as an ore of iron
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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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Cleavage: Good in one direction,fracture conchoidal to uneven Refractive index: 1.708-1.773 Birefringence: .031-.05 Pleochroism: Colorless, blue-green, yellow-green, pale rose, pale purple, pink Occurrence: Secondary mineral in the oxidized zone of ore deposits Crystal or stone size: To 3 cts
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Calcite displays rhombohedral cleavage, resulting from three cleavage planes at 120 and 60°. The analysis of crystal structure is important to understanding the types of minerals found in the field. The quantitative analysis of crystal structure can be performed using X-ray diffraction, or XRD.
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6-6.5; white to pink; no streak(too close to hardness of s. plate); 2 cleavage directions at 90 degrees; irregular stringers as in wood grain Plagioclase Feldspar 6-6.5; white to dark gray; no streak(too close to hardness of s. plate); 2 cleavage directions at 90 degrees; fine straight parallel striations
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The physical properties of minerals comprise various measurable and discernible attributes, including color, streak, magnetic properties, hardness, crystal growth form, and crystal cleavage. Each of these properties are mineral-specific, and they are fundamentally related to a particular mineral's chemical make-up and atomic structure.
DetailsThe necessary information for identifying these minerals is presented in two often-used formats on the following pages. First, the minerals are tabulated by property. Second, …
Details1 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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Often fluorescent, pale rose, yellow or bluish-white, effervesces in cold acids. Distinguished from calcite by its greater hardness, higher S.G. and different crystal forms and habits – …
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Table IIB-2: Streak Not Colored, Cleavage Not Prominent, Hardness less than 2½: (Can be scratched with a fingernail; ... Pale pink, Buff, Yellow, Red, Green: Dull to earthy : ... Any sample that keys out to this point and is not one of the above listed minerals needs to be re-examined. It probably either has a prominent cleavage or is harder ...
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The most commonly used physical properties used to identify minerals are 1. color, 2. luster, 3. hardness, 4. streak, 5. cleavage or fracture, and 6. crystal habit. In this lab, …
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Pink: 1½ to 2½: Pale-pink to Red: Perfect in one direction: ERYTHRITE Co 3 (AsO 4) 2. 8H 2 O: Monoclinic: Usually as earthy crusts or powdery coatings on cobalt minerals, may be reniform: 2.95: Streak same color as the sample but paler. Rare. (See also annabergite, below.) Pale-pink to Light-green: 1½ to 2½: Apple-green, Grey, Pale-rose
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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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The largest of these measures 0.4 x 0.3 x 0.2" (1.0 x 0.7 x 0.5 cm) and is also broken, showing a fresh cleavage plane that has a brighter pearly luster than that of the undamaged surfaces. All have a moderate to pale pink color and are translucent and milky. Their trigonal form is reasonably good.
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Non-metallic luster, light color Hardness: 3.5-4 Pink, saddle shaped crystals Cleavage: Rhombic, 3 directions not at 90 degrees Color: white or pink Plagioclase Feldspar Non-metallic luster, light color Hardness: 6-6.5 Glassy Luster, fine striations on cleavage planes Cleavage: orthorhombic at 90 degrees Color: white or gray
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Mineral Type: Cleavage. – A nonmetallic mineral that is grey, white, pink, or yellow in color, has 3 perfect cleavage planes that form rhombohedral crystals (crystals may …
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mineral - non metallic, with a light color - pale pink, with some orange - 2 demensional 90 degree cleavage - harder than glass calcite mineral - softer than glass - somewhat clear, but not transparent - non metallic, white yellowish in color - cleavage in 3 directions, not 90 degree (75 degrees, rhombus like) - softer than glass but harder ...
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A mineral with four directions of cleavage is termed octahedral. With 2 or more cleavage planes present, it is important to pay attention to the angle of the cleavage planes. To determine the angle of cleavage, look at the intersection of cleavage planes. Commonly, cleavage planes will intersect at 60°, 90° (right angles), or 120°. Be ...
DetailsMineral Name: Enstatite: Hypersthene: Crystal System: Orthorhombic: Orthorhombic: Chemical Comp.. Mg 2 Si 2 O 6: Fe 2 Si 2 O 6: Color: Colorless: Pale Pink: Pleochroism: None Pale Pink-Green: Cleavage: 2@90˚ in basal: 2@90˚ in basal: Relief: Moderate: Moderate: Birefringence: Low 1st order ... The first photomicrograph is taken under …
DetailsMost 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 …
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Quartz has no cleavage because it has equally strong Si–O bonds in all directions, and feldspar minerals have two cleavages at 90° to each other (Figure 2.3.6). When a mineral has more than one cleavage plane or cleavage direction, it is important to specify the number of cleavage planes and the approximate angle between them.
DetailsA mineral may have one or more cleavage planes. Planes that are parallel are considered to be in the same direction of cleavage and should only count as one. One direction of …
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Here are 10 samples of minerals that you will use to answer lab questions. Examine each sample in detail by rotating it and exploring its shape and physical characteristics. ... Cleavage? Fracture? Other properties: nonmetallic: 5.5-6: white to pale gray: Moderate. 2 planes, at about 90° to each other: No: color dark green to brown or black ...
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In two of the samples, the rhombus shape is apparent, but not in the third one. The first two samples have 2 apparent planes of cleavage. The color of the first two are transparent light yellow or white. The last one seems to be mixed with a dirty white and dark grey bit. This sample is spectacular.
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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.
DetailsFor many good examples of mineral fracture and cleavage, watch the video linked below: blank ️ Video 3-6: Examples of mineral fracture and cleavage (8 minutes) A good additional perspective on cleavage can be found at: blank ️ Video 3-7: Mineral cleavage (5 minutes) 3.5.3 Hardness. Hardness is a mineral's resistance to abrasion or scratching.
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Paragonite (NaAl 2 (AlSi 3 O 10) (OH) 2) is a pearly sodic white, grayish-white, pale yellow, colorless, or greenish mica mineral related to muscovite. It has a density of 2.78, a Mohs scale hardness of 2.5-3, and a refractive index of 1.564-1.609. Paragonite is an important host for strontium and boron, particularly during exhumation.
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Orange-pink or blue-green : White: Vitreous to Dull: 2 cleavage directions at 90° ... Variable: white, gray, pale blue, colorless: White: Vitreous to greasy: 3 Cleavage Directions, almost cubic. Conchoidal Fracture: 3.5: Oxides. ... A type of cleavage in which the mineral splits along a single plane or direction.
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