Cleavage Collection

Cleavage Collection

  • Mineral Cleavage Educationa Collection


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1.50 lbs
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Cleavage is a readily recognizable property of some minerals and follows the internal crystal structure of that mineral. Terms used in a study of crystallography apply to the cleavage plans. 6 specimens approximately 1 1/2" x 1 1/2".

Cleavage is the tendency of minerals to break along preferred directions. Some minerals tend to have on direction of cleavage called pinacoidal cleavage. Some minerals cleave in two directions and this is referred to as prismatic cleavage. Minerals that have cleavage in three directions not at right angles have rhombohedral cleavage. If the cleavage is in three directions at right angles it is cubic cleavage. Cleavage in four directions is called octahedral cleavage.
1. Muscovite...Pinacoidal Cleavage
2. Feldspar....Prismatic Cleavage
3. Biotite.....Pinacoidal Cleavage
4. Spodumene...Prismatic Cleavage
5. Calcite.....Rhombohedral Cleavage
6. Halite......Cubic Cleavage
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  • Mineral Hardness Scale Ruler

    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.

  • Deluxe Moh's Mineral Hardness Pick Set

    The Deluxe Moh's Hardness Pick Set now comes in two case types. The wooden case is small enough to carry and the top screws into the base to make a perfect desk stand. The plastic case is longer but the thinner size makes it easier to carry in your field tool set.

    Hardness is an important and quantifiable physical characteristic of a mineral and in your effort to identify an unknown mineral, the hardness, if known, combined with other properties, can narrow your search to just a handful of possibilities. Simply scratch a smooth surface of your unknown mineral with the picks of various indicated hardness. As an example, if a No. 5 pick scratches the mineral, but a No. 4 pick does not, then your mineral hardness is 4.5. Then compare this against a table of minerals listing hardness values to aid in identifying the unknown mineral.
    The Deluxe Mohs' Hardness Pick Set from Mineralab is unique in that, unlike other mineral hardness test tool that use minerals or crystal points, Mineralab picks are made of metals and alloys of hardness values equal to 2 through 9 on Mohs hardness scale. Because the picks are made of metal, they are easily ground to sharp points which will not break off and which can be easily sharpened.

    What is included in the Mineralab's Deluxe Mohs' Hardness Pick Set?

    • Four double-ended picks with eight points comprising 2 and 3, 4 and 5,
      6 and 7, 8 and 9 on Mohs’ hardness scale.

    • High quality brass pinch vises.

    • A glass plate (hardness of about 5.5) which, when scratched,
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    • A second hardness plate with a hardness value of 3.5.

    • A streak plate for testing a mineral’s streak color.

    • A magnet to test magnetic rocks such as magnetite and pyrrhotite.

    • A 100 grit polishing stone to keep the points sharp.

    • An attractive, mahogany-finished and compact wooden case.

    • Complete usage instructions.

    Other Features:

    • All points are stamped with the indicated hardness value, and each double-ended
      pick body is color coded for quickly finding the desired pick.

    • Hardness points can be easily and inexpensively replaced without having to
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    • Compact. The wooden storage case is only 7" tall by 2.5" wide.

    • Also use to test hardness of various materials encountered in the industrial,
      excavation, and archeological fields.

    • 1 Year Warranty
    If you are ordering only a Deluxe Moh's Hardness Pick Set you can save money on shipping by choosing USPS Priority Mail. We will use a USPS Priority Mail Small Flat Rate Box and I'll adjust your total to pass the savings back to you.
  • North American Rock Collection

    This collection with rock types and associations with the North American continent contains 50 specimens with each group represented: igneous, metamorphic, and sedimentary. Specimens are approximately 1" x 1",number coded in compartmented container.

    The current collection contains:
    Syenite-CO Obsidian-UT
    Granite-potassium-CO Rhyolite Porphyry-CO
    Pegmatite-CO Vitrophyre-CO
    Andesite-CO Vesicular Basalt-CO
    Tuff-CO Monzonite Porphyry-CO
    Granite-sodium-CO Basalt-CO
    Diorite-CO Granodiorite-CO
    Rhyolite-CO Gabbro-WY
    Pumice-CA Anorthosite-WY
    Carbonatite-QUE Scoria-CO
    Breccia-CO Trachyte-CO

    Coquina-TX Conglomerate- CO
    Siltstone-CO Sandstone-CO
    Rock Salt-UT Oil Shale-CO
    Limestone-CO Fossiiiferous Limestone-TX
    Bituminous Coal-WY Arkose-CO
    Gypsum-CO Shale-CO
    Breccia-CO Calcareous Tufa-SD
    Dolomite-CO Sandstone-banded-WY

    Gneiss-CO Slate-VT
    Mica Schist-WY Garnet Schist-SD
    Amphibolite-CO Homfels-WY
    Serpentinite-WY Quartzite -WY
    Phyllite-SD Anthracite Coal-PA
    Marble-WY Chlorite Schist-CO
  • Crystalline Aggregate Collection

    CRYSTAL HABITS AND AGGREGATES COLLECTION Many minerals form distinct crystal patterns as the crystals grow. Minerals may form isolated or distinct crystals, in radiating or parallel groups, or in a collection of crystals call aggregates. Aggregates of minerals sometimes are composed of scales or lamellae or of grains. Below is a list of terms geologists use to describe these crystal habits:
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    BANDED -narrow bands of differing colors BLADED -elongated, flattened crystals
    BOTRYOIDAL -globular forms like a bunch of grapes CAPILLARY -hair like crystals
    COLLOFORM -spherical forms of radiating crystals COLUMNAR -column like crystal
    CONCENTRIC -spherical layers around a common center CONCRETION -minerals formed around a nucleus
    DENDRITIC -slender divergent branches DRUSY -a layer of small crystals on a surface
    FIBROUS -slender fiber aggregate of crystals FILIFORM -embedded threadlike crystals
    FOLIATED -easily separated into plates GEODE - a spherical hollow cavity lined by mineral(s)
    GLOBULAR -radiating crystals forming small spheres GRANULAR -composed of grain like crystals
    LAMELLAR -plate like crystals forming layers MAMMILLARY-round masses resembling mammae
    MASSIVE -a mineral w/o distinguishing features or form MICACEOUS -easily separated into thin sheets
    OOLITIC -aggregate of small spheres resembling fish eggs PISOLITIC -aggregate of spheres the size of peas
    RADIATED -radiating crystal groups RENIFORM -radiating crystals forming kidney shape
    RETICULATED -lattice like groups of crystals ROSETTE- a flowerlike crystal growth of minerals
    STALACTITIC-conical/cylindrical deposits of minerals STELLATED -radiating crystals forming circular groups

    1.  Calcite (in Limestone) Oolitic
    2.  Quartz Geode
    3.  Wavellite Radiated/Stellated
    4.  Barite Rosette
    5.  Vanadinite Drusy
    6.  Spodumene Columnar
    7.  Gypsum var. Satin Spar Fibrous
    8.  Biotite Micaceous/Foliated
    9.  Barite Lamellar/Tabular
    10. Olivine Granular
    11. Dolomite Granular
    12. Bauxite Pisolitic
    13. Onyx Banded
    14. Chalcedony Massive
    15. Gypsum var. Alabaster Massive
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    Glass plates for use in basic mineral identification. Minerals with a hardness of 6 or higher will scratch glass making a glass streak plate a handy tool for quick test to establish on which half of the hardness scale your specimen exists. Rocks and minerals that scratch glass, and do not have cracks and pits, are those that readily take a polish in a tumbler. 1 inch by 2 inch.

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