Crystalline Aggregate Collection


Crystalline Aggregate Collection

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SKU
ED-00002301
In stock
10 available
Weight
2.50 lbs
Retail Price
$29.50
Our Internet Price
$25.08 (Save 15%)

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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:
ACICULAR -slender, needle like crystals MYGDALOIDAL A -rock with mineral filled cavaties
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

MINERAL STATE OF AGGREGATION
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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  • Mesozoic Fossils Collection

    Specimens in this collection are representative of the varied life forms which dominated this geologic era. The dinosaurs are well-known life forms from this era. The 15 specimens are from three major periods: Triassic, Jurassic and Cretaceous.
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  • Cenocozic Fossils Collection

    Representative specmens from the Quarternary and Tertiary periods are included in this 15 specimen collection. Specimens are number coded and kit comes with a key sheet.
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  • 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:
     
    IGNEOUS ROCKS
    Syenite-CO Obsidian-UT
    Granite-potassium-CO Rhyolite Porphyry-CO
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    Andesite-CO Vesicular Basalt-CO
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    Pumice-CA Anorthosite-WY
    Carbonatite-QUE Scoria-CO
    Breccia-CO Trachyte-CO

    SEDIMENTARY ROCKS
    Coquina-TX Conglomerate- CO
    Siltstone-CO Sandstone-CO
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    Limestone-CO Fossiiiferous Limestone-TX
    Bituminous Coal-WY Arkose-CO
    Gypsum-CO Shale-CO
    Breccia-CO Calcareous Tufa-SD
    Dolomite-CO Sandstone-banded-WY

    METAMORPHIC ROCKS
    Gneiss-CO Slate-VT
    Mica Schist-WY Garnet Schist-SD
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    The rocks and minerals included in this set are: Agate, Anthracite Coal, Banded Sandstone, Barite, Basalt, Bauxite, Biotite, Calcareous Tufa, Calcite, Chrysoprase, Conglomerate, Corundum, Epidote, Feldspar, Fluorite, Fossil Limestone, Galena, Garnet, Granite, Graphite, Gypsum, Hematite, Kyanite, Lepidolite, Limestone, Magnetite, Malachite, Marble, Mica Schist, Milky Quartz, Molybdenite, Muscovite, Obsidian, Oil Shale, Olivine, Petrified Wood, Porphyry, Pumice, Pyrite, Pyrolusite, Quartzite, Rhyolite, Rose Quartz, Sandstone, Scoria, Serpentine, Slate, Sphalerite, Sulfur, and Talc.
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    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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