Flourite Rock Samples - 10 specimens. Call 1-800-411-DINO (3466) for volume discounts.
Fluorite is also used as a source of fluorine for hydrofluoric acid and fluorinated water. Fluorite, calcium fluoride is a major industrial mineral used as a flux in steel making as well as in the preparation of hydrofluoric acid and in the ceramics industry. Mainly used for glasses and enamels.
Fluorite's vitreous, cubic crystals (isometric system) and cleavable, granular masses have a wide color range (often green, blue, or purple) and may fluoresce under ultraviolet light. Hardness is 4, specific gravity 3.0-3.3. Fluorite deposits form under a wide variety of conditions: as veins produced by hydrothermal alteration, as beds and cavities in sedimentary rocks, in hot spring deposits, and in pegmatites.
Granite rock samples. 10 specimens. Call 1-800-411-DINO (3466) for volume discounts. Granite is the signature rock of the continents. More than that, granite is the signature rock of the planet Earth itself.
ID Chart - MOHS Hardness Scale - Rock and Mineral Collection
Great earth science resource - Chart with samples on the Mohs Hardness Scale
Includes numbers 1-9 (all except diamond)
Specific samples included are Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum
Wonderful for Science Fair presentations on Rocks, Minerals or Geology
The chart measures 8 1/2" x 5 1/4" with samples affixed to a sturdy card with ziplock protective plastic covering
Includes 9 genuine rocks/minerals/gemstones that are one through nine on the Mohs Hardness Scale. The Moh's scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.
One pound of natural sandstone - Sandstone is a clastic sedimentary rock composed mainly of sand-sized silicate grains. Sandstones make up about 20 to 25 percent of all sedimentary rocks. Sandstone was a popular building material from ancient times. It is relatively soft, making it easy to carve. It has been widely used around the world in constructing temples, homes, and other buildings. It has also been used for artistic purposes to create ornamental fountains and statues. 10+ pieces in the lb.