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.
Heavy duty 3/4'' plain black nylon loupe lanyard with a quick release buckle and a split ring. This lanyard may be used for any purpose but we've had it custom manufactured specifically for use with the BelOMO loupe.
Important: We offer this lanyard for no additional charge when you buy the combo package of the BelOMO loupe with attached lanyard. Attaching the lanyard requires a screw to be removed so let us do it. We've been doing it for years and you save money!
Use the split ring on loupes with a mounting hook. To use the lanyard with a BelOMO loupe remove one screw on the support shaft of your BelOMO loupe, swivel the frame out of the way and slide the end over the support shaft then install the screw again. Don't use the split ring to attach the lanyard to the loupe. (We suggest that you purchase the loupe with the lanyard already installed.)
Amateur Geologist is the licensed importer of the BelOMO loupes for North America. These BelOMO 20x Quadruplet Loupe Magnifiers have a minor blemish and I won't sell them as new.
They're just as good as new, there's never a problem with the lens and you save 20% more off our already low internet price.
About the seconds:
If a screw is stripped then you'll receive a replacement screw. Never have I had the threads in the shaft stripped but if it is I'll send you a replacement.
Anyway, the optics of the loupe are always "as new" from the factory. The loupe case just has a minor blemish, the box is dirty, the screw slot has minor scuffs or something like that and I wont to sell it as new.
Limit one per customer.
The famous Estwing Geo/Paleo Pick GP100 has made a grand reentry after being out of production for several years. The handle has been beefed up to make the unit even stronger. It is 25 inches long with a total weight of 3 pounds. Painted steel with a soft vinyl grip. The light weight but great strength of this makes it a great field tool for any geologist or rockhound.
Not only is this a great digging tool but I use mine to help me navigate the steep slopes of mine tailings. Jab the tip in and pull yourself up then use the hoe end to cut a quick shelf to work from.
Estwing's Cushion Grip drilling chisel. Foam cushion grip to reduce impact. Heavy duty wide Hard Cap minimizes chips from flying off the chisel head and provides a wider head to help protect the hands from missed blows. Even has a centering target! This Estwing rock chisel has a bull or pointed edge. The tip is square, 4 sided, with each side tapering to a point. The bull point chisel for drilling into rock. Use it to gain accuracy when trying to remove specimens from the country rock. Maximum design hammer head weight: 3 lbs.
The BelOMO 15x Triplet Loupe magnifier has a viewing area of 0.38in (9mm). The 3 elements making up this achromatic triplet provide a bright and clear view. The 15x power magnification provides a nice level of magnification, good depth of field (the area that appears in focus on an object having an irregular surface like a rock or mineral). The lens glass isn't as large, wide, as the famous BelOMO 10x Triplet Loupe Magnifier but there's still lots of light for a very bright view when you need or want just more magnification than the BelOMO 10x Triplet Loupe Magnifier but not as much magnification as the BelOMO 20x Quadruplet Magnifier.
The housing and cover are coated with a matte black finish and assembled using flathead screws. Screws allow you to adjust the swing tension to your liking. Belarusian 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! The BelOMO loupes are the loupes we always use though it's the 10x that we typically carry in the field. The 15x has a more magnification with a good field of view. But the magnification is just too much for the field so it's the BelOMO 10x Triplet Loupe Magnifier carry.
Don't let this price fool you. The BelOMO loupe is a FANTASTIC buy. These are quality lenses that stand on their own against the higher priced competition. Take advantage of the recovering Belarus economy and a military supplier finding other revenue streams in a capitalistic market.
Each BelOMO loupe we ship is custom treated to prevent the screws from coming loose with usage.
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