Obsidian Rock Color:Deep black or blackish green Fracture:Conchoidal Mohs scale hardness:5 – 6 Luster:Vitreous Specific gravity:c. 2.4 Optical properties:Translucent Obsidian is a volcanic glass that occurs naturally as an extrusionaryigneous rock. ...
Obsidian has a 5.5 on the Mohs hardness scale which makes it relatively easy to use for artists and artisans. Prehistoric humans even used Obsidian as mirrors due to its reflectiveness. It was also used by tribal wise men in the stone age, lightworkers, spiritualists, Native American shamans,...
Mineral strength is calculated by measuring tenacity, hardness, cleavage, and fracture. Examine the methods of each of these concepts through examples, and learn about the usage of the Mohs scale to determine the hardness of a mineral, and find examples of brittle, malleable, sectile, and elast...
“Obsidius’ stone”; according to Pliny the Elder, the rock was discovered in Ethiopia by a certain Obsidius, or more accurately, Obsius), a homogeneous vitreous volcanic rock, usually dark-colored (black, reddish black), with a marked conchoidal fracture. The hardness on Mohs’ scale is...
It has a Mohs hardness scale rating of 5.5. This stone breaks into fragments with sharp, curved edges, which makes it ideal for cutting. Early peoples used Obsidian as tools and weapons, and the sharpness of the stone can be used today for ceremonial cutting, which we'll discuss below....
Hardness:5-6 on the Mohs scale, same as regular obsidian. Cleavage:None, like regular obsidian. Density:2.5-2.6 g/cm³, slightly higher than regular obsidian due to the iron content. Transparency:Translucent to opaque, like regular obsidian. ...
Hardness:5-5.5 on the Mohs scale, making it moderately durable for jewelry but susceptible to scratches. Transparency:Translucent to opaque, depending on the stone's thickness and clarity. Mineral composition:Primarily silicon dioxide (SiO₂) with trace elements like iron (Fe) and chromium (Cr)...
I could test the hardness and other properties of obsidian, which was actually my favorite piece in the set. It was so shiny, yet it was so smooth and didn’t contain any glittery crystals at all. I worked with the other stones as well, but my eye was always drawn back to the obsid...