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.
Height 9.5 Width 6.4
This map packet includes five maps printed on both sides. Maps one through four features gold, silver and gem deposits. The fifth map, side one, shows gold occurrances taken from an 1871 map. Side 2 is a page outlining the history of Oregon's mining operations and how to find and mark your own gold deposits. Every map tells the greatest story! Reported and known occurrences of gold and silver, as well as the popular gem deposits are identified in red. Many secrets of prospecting and mining are revealed in this collection! This publication is attractively packaged for display.
Map identifies locations of: gold and silver, agate, apache tears, bloodstone, carnelian, chalcedony, feldspar, fossils, garnet, geodes, jasper, limb casts, nodules, obsidian, opal, petrified wood, quartz, rhondonite, rhyolite, sagenite, serpentine, sunstones, thunder eggs, tourmaline, jade
The Estwing Supreme 16oz Chisel Edge Rock Hammer (E3-16BLC) is a smaller, lighter version of the Estwing Supreme 20oz Chisel Edge Rock Hammer (E3-20PC). This rock hammer has a 16 oz head and a a slightly shorter handle. This is a great rock pick for when you have a long way to carry the rock hammer, for those that prefer a lighter rock hammer, or those other times when you want a smaller rock hammer. Lighter to pack or wear on longer hikes. Choose a chisel edge rock hammer when you want to split layers of rock apart looking for fossils. The lighter weight gives a bit more control on where you place your strikes.
We've said it before but the purpose of a rock hammer is to break rock or drive chisels. With the lighter weight of the head of this hammer you're going to have to swing a lot harder and with many more blows. The smaller head face makes it harder to use when driving chisels.
|Head Width||6 1/2 inches|
|Overall Length||10 3/4 inches|
|Head Weight||16 ounces|
|Total Weight||1 pound 9 ounces|
The BelOMO 10x21mm(.85") triplet loupe magnifier has a viewing area of 0.65 inch (17mm), much larger than the Bausch & Lomb Hastings Triplet Magnifier. The 3 elements making up this achromatic triplet provide a bright and clear view. The 10x power magnification provides the best magnification to depth of field ratio and is the most popular power for a hand held magnifier. The housing and cover are machined metal and coated with a matte black finish and assembled using flathead screws. Belorussian Optical and Mechanical Association (BelOMA), makers of sights for guided weaponry, camera lenses, and other optical components manufacturers these loupes.
We highly recommend this loupe. This is the lens we use all the time.
Each BelOMO loupe we ship is custom treated to prevent the screws from coming loose with usage.
The Estwing Leather Gripped 13 oz Light Weight Pointed Tip Rock Hammer is best described as an Estwing Leather Gripped 22 oz Pointed Tip Rock Hammer (E-30) that has been trimmed down to reduce weight. The rock pick is similar is overall size to the Estwing Leather Gripped 22 oz Pointed Tip Rock Hammer (E-30). The handle is narrower but the handle length and the the length of the head are basically the same. It differs in that the hammer head striking end is a slightly smaller size and length. The pick end is the same length but tapered to a sharper point. Note that the 13 oz specifies the head weight not the total hammer weight. The 14 oz pointed tip is actually the lightest pointed tip rock hammer we carry.
|Head Width||6 3/4 inches|
|Overall Length||12 7/8 inches|
|Head Weight||13 ounces|
|Total Weight||1 pound 10 ounces|
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