PPL, Cleavage, Extinction & Birefringence in Thin-Section
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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12.001 LAB 1: MINERAL IDENTIFICATION INDEX
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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Mineral Identification Key
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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2.6: Properties Under Plane Polarized Light
Minerals within a solid solution group can have very different color characteristics in hand sample (as shown in Figure 2.6.6) and under the microscope. Figure 2.6.4. Garnet (pink) and clinopyroxene (green) under plane polarized light. Eclogite, California, Ward's collection sample, 40x total magnification. Figure 2.6.5.
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Mineral Identification Key
Only common mineral in which the hardness is so notably different along its length vs. across its width. Perfect in one direction ... Cream to Tan to Pale-yellow, Pink to Brownish-red: Vitreous to sub-vitreous, may be dull in granular masses, may exhibit pale blue to white opalescence ("moonstone") ... {001} cleavage plane, members towards the ...
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16 Amazing Pink Gems, Crystals, Minerals, and Rocks (Photos)
Morganite is a beautiful pinkish-peach gemstone ranging in hue from light to deep salmon. Its soft pastel tones are often accented with a hint of rose or orange, making it a unique and eye-catching gem. Hardness. Morganite is a relatively soft gemstone, with a hardness of 7.5 to 8 on the Mohs scale.
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3.3 A Visual Guide to Common Minerals – Dynamic Planet: …
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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Mineral Identification Key
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 …
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Lab 3—Mineral identification – Laboratory Manual for Earth …
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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2.6 Properties Under Plane Polarized Light
Minerals within a solid solution group can have very different color characteristics in hand sample (as shown in Figure 2.6.6) and under the microscope. Figure 2.6.4. Garnet (pink) and clinopyroxene (green) under plane polarized light. Eclogite, California, Ward's collection sample, 40x total magnification. Figure 2.6.5.
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Cleavage Minerals
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 Identification Key
White, Pale-pink, Pale-tan, Pale-blue: Vitreous to silky in fibrous material: PECTOLITE (Wollastonite Group) NaCa 2 Si 3 O 8 (OH) Triclinic: Usually in acicular sprays or radial fibrous aggregates: 2.84 to 2.90: Partly decomposed in acid forming a gel: 5 to 5½: Colorless to White, Pale-pink, may be Grey or other colors
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Mineral Properties Flashcards | Quizlet
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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Mineral Identification Flashcards | Quizlet
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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Amphiboles W0-1X2Y5Z8O22(OH)2
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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Mineral Identification Key
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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3.5: Mineral Properties
The minerals in Figure both have two planes of cleavage that are very close to 90°. The white dashed lines mark the edges of the planes, as in Figure shown above. See if you can find the planes repeated in the images. The images are close-up views of the minerals, only a few cm across. Sometimes you must look very carefully to …
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2.3 Mineral Properties – A Practical Guide to Introductory …
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.
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Basics--Minerals Table
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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Orthopyroxene
Mineral 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 …
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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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3.6: Identifying Minerals
Figure 3.6.4 3.6. 4: Azurite is ALWAYS a dark blue color and has been used for centuries for blue pigment. Surface color may be helpful in identifying minerals, although it can be quite variable within the same …
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3 Mineral Properties – Mineralogy
For 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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Mineral Reference
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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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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Geology rock and mineral identification Flashcards | Quizlet
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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04Lab Mineral Identification
The 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, …
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7.5: Cleavage
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 ...
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7.5: Cleavage
A 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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Mineral Identification Flashcards | Quizlet
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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