Special offers

Crystalline Aggregate Collection

Crystalline Aggregate Collection


In stock
10 available
2.50 lbs
Retail Price
Our Internet Price
$25.08 (Save 15%)


(from 1 to 10)

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

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
  • Customers Also Bought

  • Customer Reviews

  • Send to Friend

  • 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.
  • 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.
  • 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,
      quickly distinguishes hard from soft minerals.

    • 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
      replace the pick bodies.

    • 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
  • Rocks & Minerals of Western U.S. Collection, 50 piece.

    This mounted collection is comprised of 50 rock and mineral specimens emphasizing types found in the Western United States but also typical of those found world-wide. 50 specimens approximately 3/4". A 16 page Rocks and Minerals Study Guide is included.

    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.
  • Cleavage Collection

    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

Customer Reviews

There have been no reviews for this product.

  Sign in to post a review

: *
: *
: *
Type the characters you see in the picture:




Recently Viewed