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The Rock Box - Metamorphic


The Rock Box - Metamorphic

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SKU
ED-00007961
In stock
6 available
Weight
1.10 lbs
Retail Price
$14.76
Our Internet Price
$12.55 (Save 15%)

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(from 1 to 6)


A great collection of nine specimens all enclosed in a special plastic case and all with identifying labels and information. Perfect for that young budding geologist! "The Rock Box - Metamorphic" includes: Amphibolite, Anthracite, Gneiss, Hornfel, Marble, Phyllite, Quartzite, Schist, and Slate.
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    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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    ROCK-FORMING MINERALS

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    2. Feldspar var. Microcline - This potassium aluminum silicate is common in pegmatites and in some metamorphic rocks.
    3. Mica var. Muscovite - A potassium aluminum silicate that is common in granite pegmatites. Muscovite is also common in metamorphic rocks.
    4. Mica var. Biotite - Some granites, schists, and gneisses contain this iron-bearing potassium aluminum silicate.
    5. Calcite - Calcium carbonate is the major constituent of limestones and marbles.
    6. Hornblende - This complex silicate is common in metamorphic and some igneous rocks.

    IGNEOUS ROCKS

    Igneous rocks were once lava or magma, that is, a molten collection of minerals. The rate at which a lava or magma cools and solidifies influences rock texture, making it either fine, medium or coarse grained.

    7. Pumice - A light colored volcanic rock of rhyolitic composition; the texture results from bubbles formed by escaping gasses.
    8. Obsidian - Very rapid cooling caused this volcanic rock to have its glassy appearance.
    9. Basalt - This dark-colored, extrusive rock occurs as large flows, dikes, and sills.
    10. Rhyolite - Quartz and microcline are the major components of rhyolite.
    11. Andesite - The feldspar phenocrysts present in this light-colored, extrusive rock are the result of relatively slowly cooling lava at shallow depths.
    12. Granite - Feldspars and quartz made up the majority of this intrusive rock.

    METAMORPHIC ROCKS

    Metamorphic rocks are rocks that have been changed (metamorphosed), by heat, pressure, and/or hydrothermal solutions. All three rock types can be metamorphosed.

    13. Mica Schist - This rock is a highly metamorphosed shale. All schists exhibit shistose structure; the generally parallel alignment of micaceous minerals.
    14. Slate - The low-grade metamorphism of shale results in slate.
    15. Quartzite - The "parent rock" of quartzite is quartz sandstone.
    16. Gneiss - All gneisses exhibit gneissic structure, that is, alternating layers of granular minerals and micaceous minerals.
    17. Garnet Schist - Shale that undergoes complete recrystallization due to metamorphism often contains high-pressure minerals such as garnet or andalusite.
    18. Marble - This rock results when limestones or certain dolomites are metamorphosed.

    SEDIMENTARY ROCKS

    Clastic sedimentary rocks are formed from layers of sediment (fragments of older, weathered rock) exposed to pressure. Other sedimentary rocks are of organic or chemical origin.

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  • The Rock Box - Minerals

    A great collection of nine specimens all enclosed in a special plastic case and all with identifying labels and information. Perfect for that young budding geologist! "The Rock Box - Minerals" includes: Calcite, Epidote, Fluorite, Magnetite, Microcline, Olivine, Pyrite, Amethyst, Rose Quartz.
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