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Prehnite and Fluorite Crystal Mineral Specimen

$45.00

Cool pale to dark- green is named for Colonel Hendrik von Prehn who discovered it in 1777 , crystallizes in the orthorhombic system.

Fluorite is available in a vast array of colorings, it can be can be blue, purple, green, brown, or yellow. Usually found in isometric cubic crystals. Some have a combination of colors making for beautiful display pieces.

Size: 1.5″ x 2.5″

Locality: * Prospect Park Quarry, New Jersey USA.

*This quarry is currently being filled in for a housing development.  Once filled there is no possibility in getting any further minerals.

SKU: PRE12. Tags: , .

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Prehnite and Fluorite Crystal Mineral Specimen

PREHNITE

HISTORY, NAME, LOCALITIES: Prehnite, discovered in South Africa by Dutch colonial governor Colonel Hendrik von Prehn Africa in 1777, was recognized as a mineral species in 1789 and named for von Prehn.  Collecting localities are found in South Africa, Morocco, Switzerland, Mali, Australia, India, Canada, and the United States (New Jersey, Virginia, Michigan, Washington).

 

MINERALOGY, PROPERTIES, OCCURRENCE: Prehnite [basic calcium aluminum silicate, Ca2Al2Si3O10(OH)2], pronounced PRENN-ite, crystallizes in the orthorhombic system as pale-to-dark-green, botryoidal masses with distinctively ridged surfaces, and rarely as short, tabular or prismatic crystals.  An uncommon but widely distributed phyllosilicate mineral, prehnite has a Mohs hardness of 6.0-6.5, good cleavage in one direction, vitreous-to-waxy luster, and a specific gravity of 2.8-2.9.  As a secondary mineral, prehnite forms in vugs in basaltic rocks through hydrothermal metamorphism and is often associated with zeolite minerals.

 

METAPHYSICAL PROPERTIES, LORE, USES:  According to modern metaphysical practitioners, prehnite guards against unsettling and disruptive forces, enhances meditation, and is a “dream stone” that encourages lucid and memorable dreams.  Prehnite is the first mineral discovered that has a South African type locality.  Prehnite, a minor gemstone known as “Cape emerald,” is fashioned into cabochons for use in jewelry.  It has no technological uses.

 

FLUORITE

 

HISTORY, NAME, LOCALITIES: Fluorite was used as a metallurgical flux as early as 500 B.C.  Its name stems from the Latin fluere, meaning “to flow,” alluding to its ability to reduce the melting temperature of metals in smelting processes.  Notable sources are China, Russia, England, Mexico, Canada, Peru, and the United States (Kentucky, Illinois, Colorado, Oklahoma).

 

MINERALOGY, PROPERTIES, OCCURRENCE: Fluorite [calcium fluoride, CaF2], pronounced FLOR-ite, crystallizes in the cubic system as well-formed, often-twinned cubes and less often as octahedrons; it also occurs in massive, granular, and botryoidal forms.  It has a Mohs hardness of 4.0, perfect cleavage in four directions to form octahedrons, a specific gravity of 3.0-3.2, and is transparent to translucent.  Pure fluorite is colorless or white, but impurities impart a wide range of pastel colors, notably purples and greens.  Fluorite occurs in several mineralogical environments, including epithermal veins, hydrothermal replacement deposits, carbonatites, granite pegmatites, and contact metamorphic rocks

 

METAPHYSICAL PROPERTIES, LORE, USES: Medieval physicians prescribed powdered fluorite to treat kidney disease and arthritic pain.  Modern metaphysical practitioners use fluorite to calm the spirit and mind to prepare for meditation, increase objectivity and concentration, and clarify the decision-making process.  Fluorite is mined extensively as the primary source of fluorine and also serves as a metallurgical flux.  Massive fluorite is carved into decorative objects.

 

SKU: PRE12 Tags: , .

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