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mineral can not be scratched with a knife

  • NOTE: If it's really hard to scratch a mineral (but it can be scratched), the 2 minerals are close in hardness value.If something is really easy to scratch, the object doing the scratching must have a much higher hardness value. So quartz (hardness = 7) will scratch anything with a hardness equal to 7 or less (e.g., quartz, calcite, etc.).

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  • Topaz is a common mineral with a hardness of 8 on the Moh's hardness scale. This means it can scratch glass and cannot be scratched with a knife blade or masonry (steel) nail.

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  • This mineral cannot be scratched by a knife blade but it can easily be scratched with window glass. It is found in most igneous rocks, and is an essential component of crystalline rocks such as granite, gabbro, and basalt. 7. Quartz This is the most common mineral and often the most beautiful. It will easily mark steel and hard glass.

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  • Hardness is determined by the ability of one mineral to scratch another. Federick Mohs, a German mineralogist, produced a hardness scale (table 5) using a set of ten standard minerals. The scale arranges the minerals in order of increasing hardness. Each higher-numbered (harder) mineral will scratch any mineral with a lower number (softer).

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  • Jan 30, 2011· There is a story in a diamond book I have where a person found a colorless stone somewhere (a safe?) and wasn't sure if it was a diamond and had heard that diamonds cannot be scratched, so the person tested that out and the stone DID scratch yet turned out to be a diamond (now with a decorative line across the table) lol ETA - this is a true story, not in a novel...

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  • mineral can not be scratched with a knife . Mineral Descriptions Chapter 2 Lab 2, It''s fairly soft, you can not scratch it with your fingernail, and galena will not scratch a penny Galena in small pieces can be, cleavage, and does not fizz in HCl, then use a knife or a nail to scratch a piece of the mineral to make a powder, then put a drop ...

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  • To get the most accurate results, a sharp edge should be scratched against a smooth surface, on a small an area as possible. The scratch should not be conducted on a surface that is coated, chipped, or weathered, for it will give inaccurate results. When a mineral is scratched, a …

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  • "That which scratches is harder than that which has been scratched." "Objects of equal hardness can be scratched with difficulty." How to perform the scratch test: You should find a sharp corner of a mineral and scratch the smooth surface of the test object (fingernail, penny, glass plate, knife, steel file, etc.) This is the preferred method ...

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  • The Mineral Identification Key Table IB: Minerals with Metallic or Submetallic Luster & Hardness greater than 2½, but less than 5½: (Will not easily mark paper, but can be scratched with a pocket knife.)

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  • Note: There are very few common to rare non-metallic species less than 2½ in hardness which do not have at least one good cleavage. 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 than 2½.

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  • Rather, it is a method of gauging the relative hardness of a mineral. If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale. A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz. ©

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  • Mar 29, 2019· If you succeed with the "4" test but not with the "5," the mineral's hardness is between 4 and 5, and you can stop testing. Try to leave a permanent scratch mark using these common materials (or minerals found in mineral hardness test kit), starting with the lowest numbers and working upward if the test succeeds:

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  • If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale. A relative hardness value of 6.5 means that the mineral could scratch orthoclase (feldspar) but not quartz.

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  • Example: You select one of the minerals from Mohs Scale that looks like the one pictured here and find that it can be scratched by the knife (H=5.5) but not by the penny (H=3). Therefore, you are able to conclude that the specimen has a relative hardness between 3.0 and 5.5.

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  • Start studying Minerals. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... a steel knife can easily scratch this mineral is used in aluminum, on dishes that can go in the oven, in telescope and lenses, and for ornament use. apatite (1) 5 hardness steel knife can scratch this mineral well,though not as easily ...

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  • Hardness is a mineralogical term denoting how resistant a mineral is to being scratched. It should not be confused with a mineral's overall "toughness." (Diamond is the hardest known mineral, but it has a perfect cleavage and breaks easily along that cleavage.)

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  • To test two minerals against each other, try to scratch each mineral with the other in an inconspicuous place. If they both scratch each other, they have the same hardness. If only one causes a scratch, it is the hardest. Or, common objects can be used (such as pennies and nails) to see if they scratch or can be scratched by a mineral.

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  • May 17, 2013· I'm a bit confused with my daughters study quiz, and it would be much appreciated if someone could give me the answers so i can help her more. Thank you! 1. What property depends upon the amount of carbonate in a mineral sample? A.cleavage B.luster C.steak D.effervescence 2. The ability of a mineral to resist scratching is called _____?

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  • Jun 07, 2016· Which minerals scratch quartz? Diamond. Corundum (including sapphire and emerald). Chrysoberyl. Spinel. If you want more examples, see the Mohs scale of mineral hardness. Quartz isn't the hardest mineral to scratch, but it is the hardest which is ...

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  • Oct 15, 2013· Please watch this video by Thursday 10/17/2013. Testing Diamond Myths in 2019 | 5 Insights On Real Diamonds That Help Spot Fake Diamonds - Duration: 9:45. Diamant Agentur - Diamanten online ...

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  • One of the most important tests for identifying mineral specimens is the Mohs Hardness Test. This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left). The test is useful because most specimens of a given mineral are very close to the same hardness.

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  • Also if a penny can scratch a mineral it rates a 3, a fingernail is 2.5, knife blade 5.5, glass 5.5 and steel file 6.5. Talc rates a one on the scale meaning that it is the softest mineral and can be scratched by just about anything. Who is Moh? The Mohs hardness scale was name after Friedrich Moh, a German mineralogist of the seventeenth century.

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  • As is indicated by the ranking in the scale, if a mineral is scratched by orthoclase but not by apatite, its Mohs hardness is between 5 and 6. In the determination procedure it is necessary to be certain that a scratch is actually made and not just a "chalk" mark that will rub off.

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  • What hardness has a mineral that can scratch gypsum and can be scratched by calcite? Activity 13. Sort lowest to highest hardness of the following minerals: gypsum, diamond, calcite and quartz. Activity 14. a) What is the hardness of a mineral that can be easily scratched with a knife?

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  • Hardness: Scratch the mineral with the blade of a pocket knife. Rub off any loose powder to see if the mineral has been scratched. Gold is much softer than pyrite and can be cut. Pyrite cannot be scratched. (Beware – chalcopyrite looks similar to pyrite, but is softer and can be scratched with a knife.

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  • Hardness: 4 (cannot be scratched by fingernail or penny, can be scratched by a steel knife) Cleavage: 4 directions, but your sample may be bad; Clarity: naturally translucent, but often has cracks or impurities under the surface . Olivine Hardness: 7 (cannot be scratched by anything in the mineral kit) Streak: none (it scratches the streak plate)

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  • Hardness is a mineralogical term denoting how resistant a mineral is to being scratched. It should not be confused with a mineral's overall "toughness." (Diamond is the hardest known mineral, but it has a perfect cleavage and breaks easily along that cleavage.)

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  • Hardness is a measure of a mineral's resistant to abrasion. This property is easily determined and is used widely for field identification of minerals. More than a century ago. Friedrich Mohs (1773-1839), a German mineralogist, assigned arbitrary relative numbers to ten …

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  • Test your mineral specimen by trying to scratch it with your fingernail. If it doesn't scratch, next try a copper penny. If you are able to scratch your specimen with the penny but not with your fingernail, it has a hardness between 2.5 and 3.5. If the specimen does not scratch with a penny, try a knife …

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  • · Best Answer: If you cannot scratch the mineral with your fingernail that indicates that the mineral is harder than 2.5 (hardness of a fingernail) and if you can scratch the mineral with a knife that indicates that the mineral is softer than 5.5 (hardness of a knife) so which one of those minerals has a …

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