The Mineral Hardness Ruler is a stimulating visual aid, educates in one phase of mineralogy, and provides the standard ruler measurement scales needed in classes.
Rockhounds, mineral enthusiasts, students, teachers, geologists, and any one interested in rocks and minerals will find the Mineral Hardness Ruler a handy visual aid for quick information on mineral hardness.
The two-sided, flexible, glossy, vinyl ruler consists of five scales: three measurement scales and two mineral hardness scales. The measurement scales are in standard ruler measurements of tenths of inches, sixteenths of inches, and millimeters. Mohs' relative hardness numbers are integrated into the inch scales, while a separate scale exists for an absolute mineral hardness scale by Rosiwal.
On one side of the ruler are pictures of the ten common minerals, in full color, selected by Mohs for his relative hardness scale. On the reverse side of the ruler are six common items with their relative hardnesses. These items, along with known minerals, can be used as a handy field kit to test the relative hardness of an unknown mineral.
Hardness is one property of a mineral that can be used to distinguish among similar minerals. A given mineral can scratch any other mineral of the same or softer hardness. Over a hundred years ago, the German mineralogist Frederick Mohs devised the relative hardness scale that has found favor with mineralogists for over a century. Others, such as Rosiwal, formed absolute hardness scales using the same minerals as Mohs. For example, diamond, the hardest substance in Nature is not twice as hard as apatite, 10 versus 5, but over twenty thousand times as hard, 140,000 versus 6.5.
The Deluxe Moh's Hardness Pick Set now comes in two case types. The wooden case is small enough to carry and the top screws into the base to make a perfect desk stand. The plastic case is longer but the thinner size makes it easier to carry in your field tool set.Hardness is an important and quantifiable physical characteristic of a mineral and in your effort to identify an unknown mineral, the hardness, if known, combined with other properties, can narrow your search to just a handful of possibilities. Simply scratch a smooth surface of your unknown mineral with the picks of various indicated hardness. As an example, if a No. 5 pick scratches the mineral, but a No. 4 pick does not, then your mineral hardness is 4.5. Then compare this against a table of minerals listing hardness values to aid in identifying the unknown mineral.
The Valley Chisel Edge Rock Hammer, sometimes called a Paleontologist's Hammer or Fossil Hammer, has a 20 ounce head and is constructed of one piece drop forged steel with continuous forging grain flow from head to shaft. The two-tone Soft-Touch Rubber cushioned grip is shock absorbent and non-slip. The Valley Chisel Edge Rock Hammer is very similar to the Estwing 20oz Chisel Edge Rock Hammer. It differs from the Estwing mostly in the design of the grip and it is a bit shorter. The chisel edge doesn't have as much bend or bow to it as does the Estwing Chisel Edge Rock Hammer. The Valley Chisel Edge Rock Hammer has a square faced striking head on one end and a chisel edge on the other. The chisel edge is used for splitting layered rock such as shale and slate into flat sheets, usually when hunting fossils. Made in China but it's high quality. We've sold over 1300 and never had a return. The Valley Chisel Edge Rock Hammer is a great tool for the professional or recreational geologist, paleontologist or any rockhound and will last you a life time.
|Head Width||Overall Length||Head Weight||Total Weight|
|6 7/8 inches||11 inches||20 ounces||1 pound 14 ounces|
You'll spend hours studying this educational chart!! A Correlated History of Earth v8 is a full-color educational wallchart documenting 4.5 billion years of earth's natural history. Each column is a timeline from ancient times to recent. Included are plate tectonic maps, mountain building events (orogenies), major volcanic episodes, glacial epochs, all known craters from asteroid and comet impacts, over 100 classic fossil localities from around the world, fossil Ranges of plants, invertebrates and vertebrate lifeforms, and major extinction events as revealed by the fossil record. Also evident on this chart are the "cambrian" "explosion" of animal phyla and the juxtaposition of reptiles and mammals across the Cretaceous/Tertiary (K/T) boundary. Hundreds of illustrations add a striking visual dimension to the data.
Published 2016. Size 38"x 28"
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