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Topic: Mohs hardness scale


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  Mohs Hardness Scale
Mohs' scale of mineral hardness quantifies the scratch resistance of minerals by comparing the ability of a harder material to scratch a softer material.
The Mohs scale was invented in 1812, by the German mineralogist Friedrich Mohs.
With the Mohs Scale, the hardness of a material is measured against the scale by finding the hardest material that it can scratch, and/or by identifying the softest material that can scratch it.
www.khulsey.com /jewelry/mohs_hardness_scale.html   (528 words)

  
  Baxter’s The Jewellers, Birthstone Information
On the Mohs scale of hardness aquamarine measures 7-5 to 8 and is therefore a durable stone.
Sapphire and ruby have a hardness of 9 on the Mohs scale.
Mohs' scale of hardness was developed by Friedrich Mohs (1773-1839) and measures the hardness of "rock" on a scale of 1 to 10.
www.baxtersjewellers.com /birthstone_information.html   (2514 words)

  
  Mohs scale of mineral hardness - Wikipedia   (Site not responding. Last check: )
Mohs' scale of mineral hardness was created by the German mineralogist Friedrich Mohs to measure hardness.
As it is an ordinal scale, you have to compare two minerals to decide which is harder.
The scale is neither linear nor logarithmic: for example, corundum is twice as hard as topaz, but diamond is almost four times as hard as corundum.
www.facetroughgemstones.com /wikipedia/mo/Mohs_scale_of_mineral_hardness.html   (106 words)

  
  NationMaster - Encyclopedia: Hardness   (Site not responding. Last check: )
One scale that measures rebound hardness is the Bennett Hardness Scale.
Hardness is a measure of dissolved mineral salts, mainly calcium and magnesium carbonates, in water.
Hardness is expressed in degrees but the units differ form country to country and test kit measurements vary depending on whether total hardness or carbonate hardness is being determined.
www.nationmaster.com /encyclopedia/Hardness   (1707 words)

  
 Mohs' Hardness Scale
The hardest element with a 10 on the Mohs hardness scale is a diamond, and the softest element is talc.
Mohs' hardness scale is used to measure the hardness of minerals because hardness is one of the most consistent physical properties in minerals.
Mohs scale of hardness is a rough measure of the resistance of a smooth surface to abrasion or scratching by another harder mineral.
www.theflooringlady.com /mohs_hardness_scale.html   (611 words)

  
 Mohs' Scale: World of Earth Science
Mohs' scale utilizes 10 specific representative materials that are arranged numerically from the softest (1) to the hardest (10).
Mohs' scale is a relative index scale, meaning that a determination of Mohs'hardness number for a mineral is based upon scratch tests.
Hardness is a property of minerals derived from the nature and strength of chemical bonds in and between crystals.
science.enotes.com /earth-science/mohs-scale   (465 words)

  
 ROCK HARDNESS CLASSIFICATION - MOHS SCALE
The hardness of a stone is one of the properties that contribute to identification.
Hardness is also an attribute which is important to be aware of, because it may determine what a stone may be used for (jewelry, carving, faceting, handling, storage, etc.) You may want to familiarize yourself with the Mohs Scale of Hardness.
The Mohs Scale of Hardness consists of 10 classifications, 1 being the softest, and 10 being the hardest.
www.bestcrystals.com /hardness.html   (357 words)

  
 Kids.Net.Au - Encyclopedia > Mohs hardness scale   (Site not responding. Last check: )
Mohs' scale of mineral hardness was created by the German mineralogist Friedrich Mohs to measure hardness.
As it is an ordinal scale, you have to compare two minerals to decide which is harder.
The scale is neither linear nor logarithmic: for example, corundum is twice as hard as topaz, but diamond is almost four times as hard as corundum.
www.kids.net.au /encyclopedia-wiki/mo/Mohs_hardness_scale   (173 words)

  
  Mohs scale of mineral hardness - Encyclopedia.WorldSearch   (Site not responding. Last check: )
Mohs' scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer.
It was created by the German mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.
Mohs' is a purely ordinal scale with, for example, corundum being twice as hard as topaz, but diamond, almost four times as hard as corundum.
encyclopedia.worldsearch.com /mohs_hardness_scale.htm   (177 words)

  
 mohs hardness scale   (Site not responding. Last check: )
Mohs' scale of mineral hardness was created by the German mineralogist Friedrich Mohs to measure hardness.
As it is an ordinal scale, you have to compare two minerals to decide which is harder.
The scale is neither linear nor logarithmic: for example, corundum is twice as hard as topaz, but diamond is almost four times as hard as corundum.
www.yourencyclopedia.net /Mohs_hardness_scale.html   (198 words)

  
 Mohs scale - Search Results - MSN Encarta
- hardness scale: a scale used to measure the hardness of minerals, with talc at zero and diamond at 10.
The Mohs scale is used to rate the relative hardness of a material by performing...
Hardness, ability of a solid substance to resist surface deformation or abrasion.
encarta.msn.com /Mohs_scale.html   (160 words)

  
 Mohs scale of mineral hardness - Wikipedia, the free encyclopedia
It was created, in 1812, by the German mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.
The hardness of a material is measured against the scale by finding the hardest material that that the given material can scratch, and/or the softest material that can scratch the given material.
Corundum (Al Diamond (C) On the Mohs scale, fingernail has hardness 2; copper penny, about 3; a knife blade, 5; window glass, 5.5; steel file, 6.5.
en.wikipedia.org /wiki/Mohs_scale_of_mineral_hardness   (278 words)

  
 StarShineLtd.com - Gem Stones Moh's Hardness scale
Hardness is the property of a material that enables it to resist plastic deformation, usually by penetration.
The hardness is determined by finding which of the standard minerals the test material will scratch or not scratch; the hardness will lie between two points on the scale - the first point being the mineral which is scratched and the next point being the mineral which is not scratched.
Some examples of the hardness of common metals in the Moh's scale are copper between 2 and 3 and tool steel between 7 and 8.
www.starshineltd.com /hardness.htm   (349 words)

  
 Mohs Scale of Hardness
This scale is a chart of relative hardness of the various minerals (1 - softest to 10 - hardest).
Since hardness depends upon the crystallographic direction (ultimately on the strength of the bonds between atoms in a crystal), there can be variations in hardness depending upon the direction in which one measures this property.
Mohs' hardness is a measure of the relative hardness and resistance to scratching between minerals.
www.minsocam.org /MSA/collectors_corner/article/mohs.htm   (629 words)

  
 Moh' s Hardness Scale - Jewelry Armoire
In 1812 the famed German mineralogist, Freidrich Mohs, devised a mineral hardness scale that is still used to measure the hardness of minerals, gems, and crystals.
The scale arranges the minerals from the hardest to the softest.
Remember Moh's Hardness Scale -- Just because a ring has a stone in it doesn't mean that it is not vulnerable to scratches.
www.homefurnish.com /bedbathstorage/bedroomfurniture/mohshardnessscale.aspx   (284 words)

  
 Testing for hardness with Mohs scale
The hardness of a mineral is an easy diagnostic tests to perform in the attempt to identify an unknown mineral.
A scale to measure hardness was devised by Austrian mineralogist Frederick (Friedrich) Mohs in 1822, and is currently the standard scale for measuring hardness.
Fluorite at 4 is not twice as hard as gypsum at 2; nor is the difference between calcite and fluorite similar to the difference between corundum and diamond.
www.inlandlapidary.com /user_area/hardness.asp   (669 words)

  
 Mohs scale of mineral hardness Summary
Hardness is a property of minerals derived from the nature and strength of chemical bonds in and between crystals.
Hardness characteristics—especially in calcite crystals—may vary as a property dependent upon the direction of the scratch (i.e., able show evidence of a particular Mohs' number if scratched along one face or direction as opposed to a different hardness number if scratched in a different direction).
Mohs' is a purely ordinal scale with, for example, corundum being twice as hard as topaz, but diamond, almost four times as hard as corundum.
www.bookrags.com /Mohs_scale_of_mineral_hardness   (732 words)

  
 Mineral Resources in Missouri
On the Mohs hardness scale carnotite is a 2 and the specific gravity ranges from 4 to 5.
On the Mohs hardness scale the feldspars are a 6 and have a specific gravity of 2.62 to 2.76.
The hardness of gypsum is 1.5 to 2 on the Mohs hardness scale and it has a specific gravity of 2.3 to 2.4.
www.emporia.edu /earthsci/amber/go336/dreyer   (1970 words)

  
 BBC - h2g2 - Mohs Scale of Hardness
Hardness is a measure of the ability of a material to resist wear and tear - ie, abrasion.
The relative hardness of minerals is determined according to Mohs Scale, named after the German mineralogist, Friedrich Mohs, who devised it in 1812.
The scale is not a linear one, and is somewhat arbitrary.
www.bbc.co.uk /dna/h2g2/A2982576   (1064 words)

  
 mohs scale   (Site not responding. Last check: )
Mohs scale of mineral hardness From Encyclopedia.in.na (Redirected from Mohs hardness scale) Mohs' scale of mineral hardness characterizes the scratch resistance of various minerals through the...
Mohs Scale of Mineral Hardness In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals because they were common or...
Mohs' Scale Mohs' scale of hardness was developed by Friedrich Mohs and measures the hardness of "rock" on a scale of 1 to 10 using a scratch test.
www.scalesale.com /mohsscale   (973 words)

  
 Sladens - Mohs' hardness scale   (Site not responding. Last check: )
Mohs' scale ranks the scratch resistance of various minerals by the ability of a harder material to scratch a softer material.
Mohs based the scale on ten minerals that are all readily available except the last one, diamond.
Mohs' is a purely ordinal scale with, for example, corundum being twice as hard as topaz, but diamond, almost four times as hard as corundum.
www.sladens.co.nz /mohs.htm   (145 words)

  
 Coolrox Limited: Hardness Scale
The scale is a standard of ten minerals by which the hardness of a mineral may be rated.
A simple method for determining hardness is through the use of a glass plate, pocket knife, copper wire, or by a harder mineral.
Mohs Hardness Scale is as follows (from softest to hardest).
coolrox.com /hardness.htm   (100 words)

  
 Mohs scale definition - Dictionaries - ninemsn Encarta
Mohs scale definition - Dictionaries - ninemsn Encarta
hardness scale: a scale used to measure the hardness of minerals, with talc at zero and diamond at 10.
Each mineral on the scale is hard enough to scratch the one below it in the scale.
au.encarta.msn.com /dictionary_1861776093/Mohs_scale.html   (84 words)

  
 Moh's Hardness Scale
In 1822, Friedrich Moh, a German mineralogist established a practical method of comparing hardness or scratch resistance of minerals.
The Mohs’ hardness scale places ten common or well-known minerals on a scale from one to ten.
The aspect of hardness which is measured by Moh's test is the scratchability of a mineral.
www.softflexcompany.com /hardness.htm   (291 words)

  
 Mohs Scale of Hardness, Stone Age Industries
The scale goes from one to ten with ten being the hardest.
Hardness 3 may be scratched by a copper coin.
Hardness 4 & 5 may be scratched by a knife blade or window glass.
www.stoneageindustries.com /mohs_scale_of_hardness.html   (182 words)

  
 Ceratec - EN 101 Standard- Mohs   (Site not responding. Last check: )
Surface hardness is the capacity of the glazed surface to resist scratching and etching.
Under EN 101 standard, tiles are classified on a scale of 1 to 10 based on the increased hardness of the minerals used to scratch them.
The higher the Mohs hardness of the tile surface, the less the risk that objects and other materials can scratch or etch it permanently.
www.ceratec.com /CaEnMohs.asp?Prodcode=IMLGIOT0404000010L00   (98 words)

  
 Mohs Hardness Comparison Chart/Review of Abrasives at READE
The scale ranges from 1 to 10, with 1 being the softest (talc) and 10 being the hardest (diamond).
The Mohs' scale of hardness, devised by Friedrich Mohs, a German mineralogist in 1826, was originally based on the susceptibility of a material to be scratched.
The sharp edges of a hard, angular abrasive produce steep peeks and valleys in the anchor profile, thus increasing the surface area and providing an excellent condition for the mechanical bonding of a coating.
www.reade.com /Particle_Briefings/mohs_hardness_abrasive_grit.html   (1308 words)

  
 Mineral Gallery: Hardness
Hardness is one measure of the strength of the structure of the mineral relative to the strength of its chemical bonds.
The Mohs Hardness Scale starting with talc at 1 and ending with diamond at 10, is universally used around the world as a way of distinguishing minerals.
Meaning that fluorite at 4 is not twice as hard as gypsum at 2; nor is the difference between calcite and fluorite similar to the difference between corundum and diamond.
mineral.galleries.com /minerals/hardness.htm   (1031 words)

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