Large MAHOGANY OBSIDIAN Specimens * Choice of 20 * Natural Volcanic Glass * CA for Sale

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Large MAHOGANY OBSIDIAN Specimens * Choice of 20 * Natural Volcanic Glass * CA For Sale

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Large MAHOGANY OBSIDIAN Specimens * Choice of 20 * Natural Volcanic Glass * CA:
$11.28

This listing is for your choice of the Mahogany Obsidian specimens pictured from Modoc County, California. These specimens are quite showy with a nice contrast between the red and black and would make an excellent gift or addition to your collection.
This listing offers an impressive selection of large Mahogany Obsidian specimens, most ranging in size from 5-6 inches. Handpicked from the Modoc County, California, these natural volcanic glass stones are perfect for collectors of crystals and minerals. The unique shape of each specimen is sure to catch the eye, adding an interesting element to any display. The country of origin and shape of the stones are highlighted in the item aspects, making it easy for buyers to identify the specific characteristics of each piece. These specimens are perfect for anyone interested in rocks, fossils, and minerals, or for those simply looking for an eye-catching addition to their collection.
Link to Our Other Crystal and Mineral SpecimensLink to Our Other Wholesale and Bulk Minerals
Measurements:67: 4x4x3\" - 1.9 Lbs
69: 4x3x2\" - 1 Lb
71: 4x3x2\" - .9 Lbs
72: 4x4x2\" - 1.1 Lbs
76: 4x2x2\" - .6 Lbs
77: 3x3x3\" - .8 Lbs
78: 5x4x3\" - 1.7 Lbs 82: 4x3x2\" - 337 g83: 3x3x2\" - 262 g
85: 4x3x2\" - 361 g
86: 3.5x3x3\" - 340 g
87: 4x3x2\" - 332 g
88: 4.5x3x3\" - 762 g
89: 5x5x4\" - 1316 g
90: 4x3x2.5\" - 400 g
91: 4x3x3\" - 506 gLink to Our Other Obsidian Specimens
OBSIDIAN PROPERTIES:Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) causes a high viscosity, which, upon rapid cooling, results in a natural glass forming from the lava. The inhibition of atomic diffusion through this highly viscous lava explains the lack of crystal growth. Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.Category: Volcanic glass
Color: Deep black or blackish green
Fracture: Conchoidal
Mohs scale hardness: 5–6
Luster: Vitreous
Specific gravity: 2.4
Optical properties: Translucent
Other characteristics: Texture: Smooth; glassy
Courtesy of Wikipedia