We are currently out of stock of this book. The book is currently being revised and will be available again in December. You may pre-order this book and we will ship your copy once they become available.
"Invaluable to rockhounds of all ages."--Science Teacher.
"One of the 100 outstanding Sci-Tech books of the year."--Library Journal.
"Anyone interested in minerals and gems will want a copy of this beautifully-illustrated book."--Science Books & Films. (all in color)
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 Prospector's Rock Hammer is a very light duty rock hammer with a 22 oz. drop forged head and a tubular handle with rubber grip. The hammer head is larger than the Estwing Rock Hammers. The pointed end is not tapered to the extent of nor is it as long as the Estwing Rock Hammers. This is not a tip for digging fossils as it is not tapered enough to really penetrate into sandstone. The larger hammer face, the thin grip, and the duller pointed end make it a great starter rock hammer for children when you're not sure the young geologist is going to stay interested.
Cheap enough that you can throw one in each of your vehicles just in case you come across an interesting roadcu.., er..., outcrop.
The Prospector's Rock Hammer is for light duty or use with soft rock. The hammer head is pressed onto a tubular steel handle. Since it isn't one solid piece of drop forged steel like the Valley Rock Hammer or Estwing Rock Hammers it can't be used for prying out specimens. As with any two piece hammer, after a little use the head will become detached from the handle. Best used as a hammer for young children without the upper body strength to really swing a hammer with any force. Consider this a toy or a one time use hammer.
|Head Width||Overall Length||Head Weight||Total Weight|
|6 inches||12 3/8 inches||22 ounces||1 pound 10.5 ounces|
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