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BCR309 Mahogany-Obsidian

BCR309 Mahogany-Obsidian

$48.00

  • Here’s a great new item, an excellent quality select Tri-Color Obsidian.  This is a great rock for a cutting or carving project. It has natural “shinny” areas and will polish well.    
  • This particular select Tri-Color Obsidian specimen measures  7 3/4″ x  5 1/4″ x  5 7/8″  and weighs nearly 8 pound

MOHS hardness scale of  5-6

 

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Description

Obsidian is a type of naturally-occurring glass formed as an extrusive igneous rock. It is produced when felsic lava erupted from a volcano, cools rapidly through the glass transition temperature and freezes without sufficient time for Crystal growth. Because of the lack of Crystal structure, Obsidian blade edges can reach almost molecular thinness, leading to its ancient use of projectile points (arrow heads), and its modern use as surgical scalpel blades.

Mahogany-Obsidian is a volcanic rock that’s silica-rich and contains undulating parts of oxidized Hematite or Magnetite, which are usually colored mahogany brown or brick red within a black-colored base material. Mahogany-Obsidian can be found in places where volcanic activities have occurred.

Additional information

Weight8 lbs
Dimensions7.75 × 5.25 × 5.875 in

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