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Mohs scale of mineral hardness

Smoky quartz

Ultrahard fullerite

Garnet

Quartz

Corundum

Diamond

Friedrich Mohs

Mineral

Ruby

Beryl

Boron carbide

Specific gravity

Aluminium

Kuwait Airways

	Highbeam Encyclopedia - Search Results for Mohs Scale
		Rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised by German mineralogist Friedrich Mohs in 1812.
		Minerals are ranked in comparison with the Mohs scale, which is made up of 10 minerals that have been given arbitrary hardness values...
		The Mohs' scale is a means of expressing the comparative hardness of materials, particularly minerals, by testing them against ten standard materials.
	www.encyclopedia.com /SearchResults.aspx?Q=Mohs+Scale (1078 words)

	Friedrich Mohs (1773-1839) (Site not responding. Last check: )
		With his systematic classification of the realm of minerals, Mohs was in conflict with most of the other mineralogists of the time, due to his preference for physical attributes as the principles of classification (i.e., shape, cleavage, hardness, and specific weight), as opposed to the chemical composition of the minerals.
		In 1812, Mohs was appointed Professor of Mineralogy at the Joanneum in Graz.
		In 1826, Mohs was appointed Professor of Mineralogy at the University of Vienna.
	www.nhm-wien.ac.at /NHM/Mineral/Mohse.htm (276 words)

	Mohs scale of mineral hardness Summary
		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.
		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)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material.
		The Mohs scale is a purely ordinal scale.
		On the Mohs scale, a pencil lead has a hardness of 1; a fingernail has hardness 2.5; a copper penny, about 3.5; a knife blade, 5.5; window glass, 5.5; steel file, 6.5.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Mohs_scale (264 words)

	Moh's Hardness Scale - Mohs Scale (Mohs')
		It should more accurately be called a table, because it is not to scale, that is the numbers allocated to different minerals are not proportional to their actual scratch resistance, so that the scale is really an ordered list.
		Mohs, born in Gernrode, Germany, studied chemistry, mathematics and physics at the University of Halle and also studied at the Mining Academy in Freiberg, Saxony.
		In 1812, Mohs became professor in Graz; in 1818, professor in Freiberg, Saxony; in 1826, professor in Vienna.
	www.24carat.co.uk /hardnessmohsscale.html (1117 words)

	Gemstones :: Mohs Scale of Mineral Hardness
		Mohs' scale of mineral hardness characterises 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.
	www.bleedingedge.net /Gemstones/Mohs-Hardness-Scale.aspx (113 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.
		At the lower, softer end of the scale, the difference in hardness is close to linear, but at the extremes of harness, there are much greater increases in absolute hardness (e.g., a greater increase in the hardness between corundum and diamond than between quartz and topaz).
	science.enotes.com /earth-science/mohs-scale (465 words)

	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)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: )
		The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material.
		Mohs based the scale on ten minerals that are all readily available (except for diamond).
		The Mohs scale is a purely ordinal scale.
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Mohs_scale (300 words)

	BBC - h2g2 - Mohs Scale of Hardness
		In the original Mohs Scale, ten minerals were arranged in order of increasing hardness and were assigned the numbers one to ten.
		The scale is not a linear one, and is somewhat arbitrary.
		The Mohs scale is still used today although it has been extended, putting diamond at 15, to accommodate newly-developed materials of extreme hardness which lie between 10 and 15.
	www.bbc.co.uk /dna/h2g2/A2982576 (1064 words)

	Physical Characteristics of Minerals
		Mohs' method relies upon a scratch test to relate the hardness of a mineral specimen to the hardness of one of a set of reference minerals.
		Mohs' method thus relies upon a scratch test in order to relate the hardness of a mineral specimen to a number from the Mohs scale.
		The Mohs hardness parallel to the length of a kyanite crystal is 5, whereas the Mohs hardness perpendicular to the length of such a crystal is 7.
	dave.ucsc.edu /myrtreia/physical_character.html (5718 words)

	What is the Mohs Scale?
		The Mohs scale is a system of testing the hardness of a mineral, designed by Friedrich Mohs in 1812.
		Mohs was a mineralogist from Germany who wanted a simple way of testing the “scratching” ability of each mineral.
		On the traditional Mohs scale, the hardest mineral is the diamond.
	www.wisegeek.com /what-is-the-mohs-scale.htm (369 words)

	Mohs' scale (Site not responding. Last check: )
		A scale of hardness primarily used for minerals, devised around 1812 by Friedrich Mohs (1773 — 1839), a German minerologist, and published by him in 1824.
		Mohs’ scale consists of 10 common minerals in order of increasing hardness (shown in the second column below).
		Increasingly sophisticated methods for measuring hardness showed that the steps in Mohs' scale are far from equal, especially at the high end.
	www.sizes.com /units/mohs_scale.htm (217 words)

	Baxterâs The Jewellers, Birthstone Information
		On the Mohs scale of hardness aquamarine measures 7-5 to 8 and is therefore a durable stone.
		Mohs' scale of hardness was developed by Friedrich Mohs (1773-1839) and measures the hardness of "rock" on a scale of 1 to 10.
		The scale is not a linear scale, but somewhat arbitrary, and is based on ten minerals that were common or readily available at the time.
	www.baxtersjewellers.com /birthstone_information.html (2514 words)

	Mohs scale - Search Results - MSN Encarta
		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...
	encarta.msn.com /Mohs_scale.html (147 words)

	Hardness of Minerals (Site not responding. Last check: )
		His scale runs from 1, the softest point on the scale, to 10, the hardest.
		On that scale diamonds have a hardness of 1000 (the scale runs from 0 to 1000), corundum has a hardness of only 250, and topaz has a hardness of 160.
		Because of these known differences in hardness, the Mohs Scale becomes one of a number of tools that can be used in the process of identifying unknown mineral specimens.
	www.ohiohistorycentral.org /entry.php?rec=1354 (287 words)

	Utility Of Mohs Hardness Testing
		Evolved by the German mineralogist Friedrich Mohs in 1812, Mohs Hardness Test is one among the earliest ways of measuring hardness and it revolves round the observation whether a materials surface is scratched by a substance of known or defined hardness.
		Mohs hardness of a mineral is established through close observation of whether its surface is scratched by a standard substance of 'known or defined hardness'.
		Mohs hardness testing undoubtedly facilitates the identification of minerals, however, it is not the ideal method for gauging the hardness of industrial materials such as steel, iron or ceramics.
	www.articledashboard.com /Article/Utility-Of-Mohs-Hardness-Testing/129171 (570 words)

	Mohs Scale of Hardness \| unique-designer-jewelry.com (Site not responding. Last check: )
		The scale is based on a range of 1 through 10, using a : mineral to typify or stand for all other minerals of the same "s.
		The purpose of the scale is to use hardness as a test for identifying minerals.
		Still, the Mohs scale is pertinent to understanding gems and may sometimes be used in talking or writing about gems-and it does have practical aspects in its interpretation.
	www.unique-designer-jewelry.com /intrinsic-charakteristics3.htm (316 words)

	Blue Nile - Glossary
		A scale developed by Friedrich Mohs to determine the relative hardness of minerals and other objects.
		The scale assigns the numbers 1 to 10 to specific minerals, softest to hardest respectively, using a scratch test.
		For reference, the average fingernail has a Mohs hardness of about 2.5, while the average knife rates a hardness of 5.5.
	www.bluenile.com /glossary.asp?word=mohshardnessscale (56 words)

	Bob's Rock Shop: Mineral Hardness
		The classic scale for hardness was published in 1822 by Frederick Mohs, an Austrian mineralogist who got the basic concept from scratch tests performed routinely by miners.
		Since Mohs published the scale, it bears his name rather than that of the unknown genius who thought of it.
		Mohs' scale has stood the test of centuries as a useful tool for mineral identification.
	www.rockhounds.com /rockshop/hardness1.html (1290 words)

	On A Scale of One to Ten
		The Mohs scale ranks minerals from one to ten, with one being the softest and ten the hardest.
		Newer scales used by gemologists organize the gems according to degree of hardness.
		However, the Mohs scale continues to be the most widely-used ranking.
	www.suite101.com /article.cfm/gems_and_minerals/13835 (395 words)

	Mohs Scale of Hardness
		One of the most striking examples of this is kyanite, which has a hardness of 5.5 parallel to the 1 direction (c-axis), while it has a hardness of 7.0 parallel to the 100 direction (a-axis).
		Other hardness scales rely on the ability to create an indentation into the tested mineral (such as the Rockwell, Vickers, and Brinell hardness - these are used mainly to determine hardness in metals and metal alloys).
		The scratch hardness is related to the breaking of the chemical bonds in the material, creation of microfractures on the surface, or displacing atoms (in metals) of the mineral.
	www.minsocam.org /MSA/collectors_corner/article/mohs.htm (629 words)

	Mohs scale (Site not responding. Last check: )
		A scale for determining the relative hardness of a mineral according to its resistance to scratching by one of the minerals which follow it in the scale, arranged in order of increasing hardness.
		The scale is as follows: 1-talc; 2-gypsum; 3-calcite; 4-fluorite; 5-apatite; 6-feldspar; 7-vitreous silica; 8-quartz; 9-topaz; 10-garnet; 11-fused zirconia; 12-fused alumina; 13-silicon carbide; 14-boron carbide; 15-diamond.
		The scale was devised by Friedrich Mohs (1773-1839), German mineralogist.
	www.busakshamban.us /ref_glos_global.htm?w=433 (159 words)

	HotBot Web Search for mohs
		In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals...
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	Mineral Resources: Hardness
		A scale to measure hardness was devised by Austrian mineralogist Frederick (Friedrich) Mohs in 1822, and is currently the standard scale for measuring hardness.
		The scale consists of numbers one through ten; 1 being the softest and 10 being the hardest.
		Although the Mohs scale is very useful, it is not linear.
	www.minerals.net /resource/property/hardness.htm (916 words)

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