We provide you with all accessories of mining machinery and equipment produced by our company, with complete models, reliable performance, stability and durability. Ensure the first time to meet customer parts replacement needs, reduce customer downtime maintenance time.
Get a QuoteThe products are exported to more than 160 countries and regions at home and abroad, and the common choice of more than 200000 users
Our Hot Products - Have been exported to more than 150 countries and well recognized as money-maker for mining and mineral industries.
2 Gypsum can be scratched by a fingernail but cannot be scratched by talc 3 Calcite can be scratched by a penny 4 Fluorite can be scratched by a steel knife or a nail file 5 Apatite can be scratched by a steel knife or a nail file but not easily 6 Feldspar knife cannot scratch it it can scratch glass 7 Quartz scratches glass and steel 8 Topaz can scratch quartz 9 Corundum can scratch topaz 10
Let us say that your unknown mineral specimen was not scratched by feldspar H6 was scratched by quartz H7 and did itself scratch quartz Then the unknown must have a hardness equal to that of quartz or H7 If your unknown specimen was not scratched by feldspar H6 was scratched by quartz H7 and did not itself scratch quartz
Can be scratched with Copper 4 FluoriteMalachite Can be scratched with knife 5 Apatite Can be scratched with knife 6 FeldsparAmazonite Knife barely scratches it 7 QuartzAgate Scratches glass easily 8 Topaz Scratches Glass and mon minerals 9 RubySaphire Scratches Topaz and mon minerals 10 Diamond Scratches Topaz and mon minerals
From softest to hardest Talc is the softest mineral and has a value of 1 Diamond the hardest of all minerals has a value of 10 A mineral can be scratched only by other minerals that have the same hardness or are harder To determine the hardness of an unknown mineral you test whether it scratches or is scratched by the minerals in the scale For
Nov 29 2017Many minerals like jade quartz feldspar tourmaline and many others I think that covers all the mon materials there are many industrial materials that work too including carborundum zircon garnet and most ceramics
16 Which one of the following statements is true about the property of cleavage in minerals a All minerals except quartz have cleavage b The type of cleavage a mineral possesses depends on its position ferromagnesian minerals do not have cleavage c The directions of cleavage is always parallel to the faces or planes of wellformed crystal shapes d The directions of cleavage
Vitreous Luster any color can occur Conchoidal fracture hexagonal crystals mon Hardness 7 Quartz Barrel shaped hexagonal crystals Hardness 9 Commonly brown Corundum Dodecahedron Crystal Balls Color often dark red or reddish brown Vitreous luster Fracture may resemble poor cleavage Hardness 775 Garnet Green Sand Grains
The powder can be rubbed or blown off and surface scratches can usually be felt by running the fingernail over the surface One can also get a relative feel for the hardness difference between two minerals For instance quartz will be able to scratch calcite with much greater ease than you can scratch calcite with fluorite
You can use the minerals in the scale to test the hardness of an unknown mineral Mohs Hardness Scale As you can see diamond is a 10 on the Mohs Hardness Scale Diamond is the hardest mineral no other mineral can scratch a diamond Quartz is a 7 It can be scratched by topaz
The MOHS scale was created by trying to scratch one mineral with another and then recording which mineral left a scratch Fro example Corundum Sapphire and Ruby was used to scratch um left a scratch on the surface of Apatite and so this mineral
Mar 16 2017Weegy TOPAZ cannot be scratched by quartz User The broad slightly domeshaped volcanoes of Hawaii are A cinder cone volcanoes B shield volcanoes C pyroclastic volcanoes D posite cone volcanoes Weegy The broad slightly dome
With a Mohs scale anyone can test an unknown mineral for its hardness Imagine you have an unknown mineral You find that it can scratch fluorite or even apatite but feldspar scratches it You know then that the minerals hardness is between 5 and 6 Note that no
Diamond is the hardest mineral no other mineral can scratch a diamond Quartz is a 7 It can be scratched by topaz corundum and diamond Quartz will scratch minerals that have a lower number on the scale Fluorite is one Suppose you had a piece of pure gold You find that calcite scratches the gold Gypsum does not
Oct 16 2010The minerals on the Mohs scale that is higher in ranking to apatite will scratch it That means feldspar quartz topaz corundum and diamond will scratch apatite The minerals on the Mohs scale that is lower however will be scratched by apatite That means talc gypsum calcite and fluorite will be scratched by apatite
Minerals The Mohs scale is a purely ordinal scale For example corundum 9 is twice as hard as topaz 8 but diamond 10 is four times as hard as corundum The table below shows the parison with the absolute hardness measured by a sclerometer with pictorial examples
If a penny does not scratch your unknown specimen but the knife blade does then you can correctly conclude that it is harder than calcite H3 but softer than orthoclase H6 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 H55 but not by the penny H3
Hardness It can be scratched with a copper coin Chalcopyrite has a hardness of 35 to 4 It can be scratched with a steel penknife but not by a copper coin Pyrite has a hardness of 6 to 65 too hard to be scratched with a steel penknife When testing for hardness people sometimes mistake the powder of the softer mineral for a scratch on the harder one
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 57 on Mohs scale A relative hardness value of 65 means that the mineral could scratch orthoclase feldspar but not quartz
This particular mineral is probably more than a six but less than an eight The correct answer is D Lets break it down If the mineral cannot be scratched by feldspar it has to be at least as tough as that Feldspar falls at a six on the Mohs scale Next the question mentions that the
Streak The streak of a mineral is the color of the mineral in powder form This can be determined by dragging the mineral across an unpolished tile The color of a minerals streak can not be changed weathering has no effect on the streak Talc has a white streak no matter what color it is on the out side
Physical Science tutorial written by Luke T a tutor on The Knowledge Roundtable One of the most diagnostic properties of minerals is their hardness This is determined by a minerals ability to scratch another rock or on the other hand a minerals ability to resist scratching The softest minerals can be scratched with your fingernail minerals a little harder can be scratched with a penny
You use the Mohs hardness scale by testing an unknown mineral against one of the standard minerals Whichever one scratches the other is harder and if both scratch each other they are the same hardness
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
You can tell what Topaz can scratch by looking at the Mohs Scale of Hardness It looks at ten well known easily available minerals and arranged them in order of their scratch hardness
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 57 on Mohs scale A relative hardness value of 65 means that the mineral could scratch orthoclase feldspar but not quartz
Mohs scale of mineral hardness There are ten minerals in Mohs scale talc gypsum calcite fluorite apatite feldspar quartz topaz corundum and for last and hardest diamond Because the Mohs scale was made long ago it is not exactly correct for example several minerals are now known to be harder than the diamond
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 57 on Mohs scale A relative hardness value of 65 means that the mineral could scratch orthoclase feldspar but not quartz
2 Mohs Vickers hardness parison This chart pares the hardness of index minerals of the Mohs hardness scale an integer scale with their Vickers hardness a continuous scale Mohs hardness is a resistance to being scratched while Vickers hardness is a resistance to indentation under pressure
Scratch tests are a mon method used to identify mineral hardness relative to Mohs scale Streak tests are often carried out on streak plates Mineral hardness is a fundamental property of minerals and can be used to identify unknown minerals In the absence of parative minerals geologists often resort to mon objects with a relatively
Can be scratched by a fingernail 2 Gypsum Plaster of paris Gypsum is formed when seawater evaporates from the Earths surface May be scratched by a fingernail or by a copper coin 3 Calcite Limestone and most shells contain calcite Can be scratched by a steel pocket knife or sometimes a
HARD Minerals that cannot be scratched with a steel nail Mineral cannot be scratched with a fingernail but can be scratched with a steel nail Mineral cannot be scratched with a steel nail Mineral cannot be scratched with a steel nail
MINERAL PROPERTIES HARDNESS Hardness is defined by how well a substance will resist scratching by another substance For example if mineral A scratches mineral B and mineral B does not scratch mineral A then mineral A is harder than mineral B If mineral A and B both scratch each other then their hardness is equal
Corundum 9 is twice as hard as topaz 8 and diamond 10 is four times as hard as corundum Note diamonds and only diamonds can scratch other diamonds Hardness Ranges The hardness of a material may vary slightly with position and also with its state of aggregation Measuring gemstone hardness can be tricky Often a mark that looks like a scratch is actually a trail of powder left by the
What mineral can scratch a piece of glass Wiki Answers Any mineral with roughly a hardness of 6 or more on the Mohs scale of mineral hardness could scratch glass which is Some minerals that could scratch glass would be quartz topaz corundum and diamond Any type of feldspar or quartz
Which mineral scratches topaz but not diamond feldspar which mineral can be scratched by a nail but cant scratch glass apatite which 2 minerals can be scratched by your fingernail gypsum and talc luster The way a mineral reflects light cleavage the splitting of a mineral along smooth flat surfaces
Nov 28 2010Minerals that will scratch apatite must be more than a 5 on the Mohs hardness scale So feldspar quartz topaz corundum and diamond will scratch apatite
