FEDERAL MINING CLAIM
This is a Federal Mining Claim - located, recorded, and
maintained in accordance with 43 C.F.R Part 3800 and
30 U.S.C. 22 et seg.; 43 U.S.C. 1744 and all appropriate
All persons are warned that disturbance of the monu-
menats, surface, or improvements on this claim or removal
of minerals of any type without permission of the claim-
ant, will result in their prosecution under the appropriate
state and federal statues.
Federal Serial Number
Estwing Blue Nylon Sheath for Chisel Edge Rock Hammers #24
Long handled version of the Estwing Supreme Big Face 22 oz Chisel Edge Rock Hammer E6-22BLC
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.
Sign in to post a review