The Valley Rock 20 oz Pointed Tip Hammer is similar in weight, and quality, to the Estwing 22oz Pointed Tip Rock Hammer. It is a smaller rock hammer than all the Estwing Rock Hammers except the Estwing 14 oz Pointed Tip Rock Hammer.. One piece drop forged design creates a virtually unbreakable heavy duty hammer - drop forged, heat treated, fully polished. The two-tone Soft-Touch Rubber cushioned grip is form fitting, shock absorbent and non-slip.rubber grip is finger fitted, shock absorbent and non-slip.
The Valley 20 oz Pointed Tip Rock Hammer is similar in weight, and quality, to the Estwing 22oz Pointed Tip Rock Hammer. It is a smaller rock pick than all the Estwing rock picks except the Estwing 14 oz Pointed Tip Rock Hammer. It has a square faced striking surface, larger than the Estwing rock picks, on one end and a pointed pick tip on the other. Made in China but it's high quality. We've sold over 2100 and have only had one returned for a broken tip. (The hammer had what looked like vice marks on it so I suspect the damage was artificially introduced.). This Valley 20 oz Pointed Tip Rock Hammer is a great tool for the professional, student, or recreational geologist and a great rock hammer for rockhounds. It will last you a life time.
|Head Width||Overall Length||Head Weight||Total Weight|
|7 inches||11 inches||20 ounces||1 pound 14.5 ounces|
The book's four sections give a short introduction to geology and Minnesota's place in geologic history; a historic timeline; a look at the metallic minerals, nonmetals, and water present today; and a geologic picture of today's Minnesota arranged in five geographical regions. This book is both a wonderful source of information for rock hounds and the perfect backpacking companion for tourists and outdoor enthusiasts. Lavishly illustrated with color and black-and-white photographs, as well as extensive graphs and maps, Minnesota's Geology will inform and delight for years to come.
"This is certainly one of the finest books about the geology of any state in the United States. It is written at a level that should satisfy the visitor, the student, and even most professionals." American Scientist
"A stunning guide . . . Minnesota's Geology will be as valuable to the rock hound or student as it is to a trained geologist." Duluth News-Tribune
"Minnesota's Geology sets a standard of excellence for books about the geology of a region. . . . an unusually well-written and well-balanced book." Science Books and Films
Richard W. Ojakangas and Charles L. Matsch are professors in the Department of Geological Sciences at the University of Minnesota, Duluth.
This is a great little pocket guide to rocks and minerals. It uses color drawings to illustrate the rocks and minerals which I find is far more handy that pictures of museum quality specimens. Rocks and minerals in the field often don't know what they're supposed to look like so they are more average than those museum exhibits!
The colors, shapes and properties of minerals vary from the bland to the magnificent. Guide to Minerals, Rocks and Fossils is a practical and authoritative handbook that is both comprehensive and easy to use.
Each of the 600 specimens is shown in full color, sometimes in two or more forms. There are also drawings that show the structure of the crystalline specimens. It covers the basics like granite, as well as oddities like meteorites and tektites.
Fossils include sponges, corals, arthropods, brachiopods, and fossil land plants.
Each is described in detail, with notes on: - color and transparency - grain size - hardness - structure - occurrence - mineralogy - distinguishing features - habit - cleavage - texture - alteration - luster
Mineral names, chemical formulae and structural data accord to international standards. This is a very complete, but attractive and useful volume in a respected series.
Amateur Geologist note: This book originally was published by Cambridge under the title of Cambridge Guide to Minerals, Rocks and Fossils with this description: Whether hiking along a mountain trail, setting up camp in the field, or working in a garden, this is the definitive resource for anyone interested in identifying the rocks, minerals, or fossils they come across. Easily portable and with nearly 250 illustrations, with 145 in full-color, Cambridge Guide to Minerals, Rocks and Fossils is an indispensable handbook for amateur collectors and specialists alike. For each mineral, the authors explain and list the physical and optical properties, from crystal systems, hardness and fracture to color, transparency, and luster. They also discuss the occurrence of each mineral, as well as handy tips on their distinguishing features. For each type of rock, the Guide lists the color, color index, grain size, texture, structure, mineralogy, and field relations. In addition, for each fossil, the authors provide their corresponding type, age, and geographical distributions, along with detailed descriptions of their sizes and shapes. The clear, informative illustrations help elucidate technical concepts that often befuddle amateur collectors.
In this book two renowned experts share their lifelong passion for geodes and their extensive knowledge of world-class geode deposits as they present the latest theories on the formation and occurrence of these amazing mineral gifts of nature.
The most comprehensive book ever written on geodes of the Americas - a definitive reference for serious collectors and a delightful mineral exploration for both experts and novices.
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.
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