Obsidian

image

On the show , we discussed obsidian  on the “do you know” segment,  let’s just have fun flowing in this together.
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.

It is produced when felsic lava ( felsic refers to igneous rocks that are relatively rich in elements that form feldspar and quartz) extruded from a volcano cools rapidly with minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Obsidian is hard and brittle; it therefore fractures with very sharp edges, which were used in the past in cutting and piercing tools, and has been used experimentally as surgical scalpel blades.
Origin and properties
Obsidian is the rock formed as a result of quickly cooled lava, which is the parent material. Having a low water content when newly formed typically less than 1% water by weight, obsidian becomes progressively hydrated when exposed to groundwater, forming perlite . (Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed

image

Pure obsidian is usually dark in appearance, though the color varies depending on the presence of impurities. Iron and magnesium typically give the obsidian a dark brown to black color. Very few samples are nearly colorless. In some stones, the inclusion of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). It may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled. These bubbles can produce interesting effects such as a golden sheen (sheen obsidian). An iridescent, rainbow-like sheen (rainbow obsidian) is caused by inclusions of magnetite nanoparticles.

Historical us

image

Obsidian arrowhead

e

Obsidian arrowhead,  The first archaeological evidence known of usage were made from within Kariandusi and other sites of the Acheulian age (beginning 1.5 million years previously) dated 700,000 BC, although the number of objects found at these sites were very low relative to the Neolithic. Some of its other uses include : plates, swords, tool

image

image

image

s, etc

Current use

Though not approved, obsidian is used by some surgeons for scalpel blades, as well-crafted obsidian blades have a cutting edge many times sharper than high-quality steel surgical scalpels, the cutting edge of the blade being only about 3 nanometers thick.Even the sharpest metal knife has a jagged, irregular blade when viewed under a strong enough microscope; when examined even under an electron microscope an obsidian blade is still smooth and even.One study found that obsidian incisions produced fewer inflammatory cells and less granulation tissue at 7 days, in a group of rats.
Well , this should be enough info for you who wish to a little about obsidian, keep checking out this blog for further information on points given on “do you know segment “.
Stay blessed.

TOPE KUTELU
VOICE ACTOR, CONTENT PROVIDER AND AUDIO PRODUCER

Advertisements
Standard

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s