Minerals

Pseudomorphs are mineral specimens that have the external shape of one mineral but are composed of another.  The pseudomorph goethite after marcasite forms when marcasite is exposed to oxidizing conditions and starts to oxidize and break down. As the marcasite breaks down, goethite replaces it in the crystal structure, preserving the shape of the original marcasite crystal. The resulting specimen appears as a marcasite crystal, but is actually composed of goethite.

The Farafra Oasis, in the White Desert, has been known for a number of years to deliver incredible pseudomorph specimens. The pseudomorphs occur within the Cretaceous Khoman Chalk, from which the White Desert derives its name.

These specimens are remarkable for their relatively sharp marcasite crystal forms in aesthetic crystal clusters. They are in excellent condition.  This collector's specimen is unique, of great quality and ready for display.

Name: Goethite After Marcasite Pseudomorph
Specimen Size:  Miniature-Sized
Dimensions:  42x39x28 mm / 1.6x1.5x1.1 inches
Weight:  45.8 grams / 1.6 ounces
Origin: Found in White Desert, Farafra Oasis, Egypt

Pseudomorphs are mineral specimens that have the external shape of one mineral but are composed of another.  The pseudomorph goethite after marcasite forms when marcasite is exposed to oxidizing conditions and starts to oxidize and break down. As the marcasite breaks down, goethite replaces it in the crystal structure, preserving the shape of the original marcasite crystal. The resulting specimen appears as a marcasite crystal, but is actually composed of goethite.

The Farafra Oasis, in the White Desert, has been known for a number of years to deliver incredible pseudomorph specimens. The pseudomorphs occur within the Cretaceous Khoman Chalk, from which the White Desert derives its name.

These specimens are remarkable for their relatively sharp marcasite crystal forms in aesthetic crystal clusters. They are in excellent condition.  This collector's specimen is unique, of great quality and ready for display.

Name: Goethite After Marcasite Pseudomorph
Specimen Size:  Miniature-Sized
Dimensions:  40x36x24  mm / 1.6x1.4x0.9 inches
Weight:  51.7 grams / 1.8 ounces
Origin: Found in White Desert, Farafra Oasis, Egypt

Pseudomorphs are mineral specimens that have the external shape of one mineral but are composed of another.  The pseudomorph goethite after marcasite forms when marcasite is exposed to oxidizing conditions and starts to oxidize and break down. As the marcasite breaks down, goethite replaces it in the crystal structure, preserving the shape of the original marcasite crystal. The resulting specimen appears as a marcasite crystal, but is actually composed of goethite.

The Farafra Oasis, in the White Desert, has been known for a number of years to deliver incredible pseudomorph specimens. The pseudomorphs occur within the Cretaceous Khoman Chalk, from which the White Desert derives its name.

These specimens are remarkable for their relatively sharp marcasite crystal forms in aesthetic crystal clusters. They are in excellent condition.  This collector's specimen is unique, of great quality and ready for display.

Name: Goethite After Marcasite Pseudomorph
Specimen Size:  Cabinet-Sized
Dimensions:  62x36x32  mm / 2.4x1.4x1.2 inches
Weight: 72 grams / 2.5 ounces
Origin: Found in White Desert, Farafra Oasis, Egypt

This is a fabulous specimen of black kyanite mined in Marilac, Safira pegmatite district, Eastern Brazilian pegmatite province, Minas Gerais, Brazil.  The specimen will sit perfectly flat to allow easy display in a favorable position.

Kyanite is a silicate mineral and is known to be one of the most attractive natural minerals in the world. Frequently found with lustrous bladed crystals, the intensity of color varies by location of extraction.  Kyanite regularly forms fibrous, radiating crystals, as well as flattened and tabular. Some crystals form with white striations, color bands, and even multi-colored crystals, though typically found with a deep blue streak running down the middle.

Name:   Kyanite Crystal
Specimen Size:  Cabinet-Sized
Dimensions:  77x45x31 mm / 3.0x1.8x1.2 inches 
Weight:  164 grams / 5.8 Ounces 
Origin:  Safira pegmatite district, Eastern Brazilian pegmatite province, Minas Gerais, Brazil

Sodalite is usually found in the massive form, rather than crystals. Its name is derived from its sodium content. This stone is frequently found with lapis lazuli, but contains little or no golden pyrite specks in it as lapis does. It may, however, contain patches or streaks of white calcite. Although some people think that sodalite resembles lapis in some ways, it is entirely different in chemical composition and has more of a navy blue coloring.

Would be a beautiful addition to any new or existing collection.

Name:  Sodalite
Specimen Size:  Miniature-Sized  
Dimensions:  56x51x39 mm / 2.2x2.0x1.5 inches  
Weight:  104 Grams / 3.7 Ounces  
Origin:  Mined in Princess Sodalite Mine, Bancroft, Ontario, Canada

This is a cut section of a colorful rock material of bluish-brown Triphylite from the New Hampshire area.  The mine number is not available for this specimen, so it could have come from any of the Palermo mines.  Superb example specimen professionally prepared and in perfect condition.

Name: Triphylite
Specimen Size:  Large Cabinet-Sized
Dimensions:  111x67x35 mm /  4.4x2.6x1.4 inches
Weight:  274 Grams / 9.7 ounces
Origin: Mined in Palermo Mine, North Groton Pegmatite District, Grafton County, New Hampshire

Product Name: Natural Grossular Garnet var Hessonite 
Specimen Size:  Thumbnail-Sized  
Dimensions:  27x14x13 mm / 1.1x0.5x0.5 inches Specimen  
                       35x33x33 mm / 1.4x1.3x1.3 inches Box  
Weight:  8.5 Grams / 0.3 Ounce
Origin: Mined in Eden Mills, Vermont, USA

This Microcline feldspar cluster from Nevada is a quality specimen that would be a beautiful addition to any new or existing rock collection.

Microcline is one of the most common feldspar minerals. It can be colorless, white, cream to pale yellow, salmon pink to red, or bright green to blue-green. Microcline forms short prismatic or tabular crystals that are often of considerable size: single crystals can weigh several tons and reach yards in length.

Crystals are often multiply twinned, with two sets of fine lines at right angles to each other. This gives a plaid effect that is unique to microcline among the feldspars. 

Name:  Microcline 
Specimen Size:  Large Cabinet-Sized
Dimensions: 116x88x45 mm / 4.6x3.5x1.8 inches
Weight: 389 grams / 13.7 oz
Origin:  Search Light District, Nevada, USA

Malachite is perhaps the one of the most popular minerals for collectors, as its rich patterned coloration in shades of green is unique among gems. It is a beautiful decorative stone. Its’s low hardness makes it easy to work, though it still takes a polish very well. These qualities, combined with ready availability, make malachite a popular choice for lapidary artistry. This self standing Malachite would be a beautiful addition to any new or existing collection.

Name: Malachite
Specimen Size:  Cabinet-Sized
Dimensions: 90x75x27 mm / 3.5x2.9x1.1 inches
Weight: 242 grams / 8.5 Ounces
Origin: Mined in Concepcion del Oro, Zacatecas, Mexico

Product Type: Rock Tumbler Madagascar Mixed Rocks Refill Kit
Approx Weight (per piece):  4 X 1 Pound Bags
Size: Various
Shape: Rough
Type Variety pack (Includes Quartz, Amethyst, Jasper and Obsidian)
Origin: Madagascar

Comes with a National Geographic instruction and learning guide.