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 Raytech Tumble-Vibe 5 Vibratory Tumbler (Model TV-5) is economical and versatile.
Thousands of satisfied customers testify to the durability and simplicity of the Tumble-Vibe 5. Mated with a spare bowl, and a GSH-2 Stone finish Kit, the new TV-5 Starter Kit is a must for any beginner.
This new kit comes complete and ready to operate with a motorized base, two bowls, clear lid, 2 rubber nuts and all the grits necessary for accomplishing the grinding step through the final polish step of most gemstones. The (4) steps that are included are Silicone Carbide (100/1200) Silicon Carbide (700F), Iolox 50, Raybrite TL (GS-H2 Stone Finish Kit for hard rocks and minerals). There's enough grit for 8-15 pounds of stones. This new compact system will handle a myriad of applications. (Polished stones for illustration only. They are not included with this tumbler.)
Check out this article on Vibratory Tumblers
This popular low-cost unit is a favorite of the hobbyist and is used commercially as well. Vibrating rock tumblers process rocks 5 times faster than rotary rock tumblers. See results in days rather than weeks! This vibrating rock tumbler will process about four pounds of rock in it's .05 cu ft (3 pint) bowl. Bowl diameter is 8" and has a new convenient solid lid system. Shipping weight is 12 lbs., 1.05 cu. ft.
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 Estwing Supreme 13 oz Light Weight Rock Hammer is best described as an Estwing Supreme 22oz Rock Hammer that has been slimmed down to reduce weight. The rock pick is similar is overall size to the Estwing Supreme 22 oz Rock Hammer. The handle is narrower but the length is almost the same as is the length of the head. It differs in that the hammer head (square) striking end is a slightly smaller size and length. The pick end is the same length but tapered to a sharper point.Great hammer for digging fossils from sandstone. Note that the 13 oz specifies the head weight not the total hammer weight. The 14 oz is actually the lightest pointed tip rock pick that we carry.
|Head Width||6 1/4 inches|
|Overall Length||12 1/2 inches|
|Head Weight||13 ounces|
|Total Weight||1 pound 12 ounces|
Provides a primary presentation of the basic rock types. Includes five each of igneous, sedimentary and metamorphic rocks, totaling 15 specimens, approximately 1 1/2" x 1 1/2".
INTRODUCTORY ROCK COLLECTION
This rock collection contains fifteen rocks that are representative of the three major rock types: Igneous, Sedimentary and Metamorphic.
IGNEOUS ROCKS are formed by the cooling of molten rock, either magma or lava.
1. OBSIDIAN is a black or brown volcanic rock composed of quartz and alkali feldspar.
2. GRANITE is a medium to coarse-grained rock derived from magma and is composed primarily of the minerals quartz and alkali feldspar.
3. BASALT is a microcrystalline dark colored lava rock composed mainly of calcic plagioclase and clinopyroxene.
4. SCORIA is a dark colored, vesicular, crust on the surface of lava. The vesicles are the result of escaping gas before solidification.
5. RHYOLITE is a usually light colored lava rock that is of the same composition as granite.
SEDIMENTARY ROCKS are rocks derived from preexisting rocks through the processes of erosion, followed by compaction, or chemical precipitation.
6. SHALE is a rock composed of clay, silt, or mud sized particles that is typically fissile.
7. BRECCIA is composed of angular fragments of limestone or quartz formed by friction or crushing processes.
8. SANDSTONE is essentially sand-sized particles cemented together by calcite, silica, or iron oxides.
9. CONGLOMERATE is a coarse-grained rock composed of rounded fragments set in a fine-grained matrix of sand or silt or other cementing materials.
10. LIMESTONE is a generally light colored rock composed mainly of calcium carbonate formed by either organic or inorganic processes.
METAMORPHIC ROCKS are rocks that are recrystallized by pressure and heat that may or may not be influenced by the introduction of chemically active solutions.
11. SLATE is metamorphosed shale and can be broken along planes independent of original bedding planes.
12. MARBLE is recrystallized limestone (calcite).
13. QUARTZITE is a recrystallized sandstone or chert consisting mainly of quartz.
14. GNEISS is a metamorphosed rock that exhibits alternate banding of granular mineral and flaky minerals.
15. SCHIST is a metamorphosed shale or siltstone composed of parallel aligned micas, amphiboles, pyroxenes or garnets.
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