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Igneous rocks form by the cooling & crystallization of hot, molten rock (magma & lava). If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. If this happens deep underground, they are intrusive igneous rocks. Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy.
Obsidian is readily identifiable. It is a glassy-textured, extrusive igneous rock. Obsidian is natural glass - it lacks crystals, and therefore lacks minerals. Obsidian is typically black in color, but most obsidians have a felsic to intermediate chemistry. Felsic igneous rocks are generally light-colored, so a felsic obsidian seems a paradox. Mafic obsidians are scarce, but they are also black and glassy.
Obsidian is an uncommon rock, but can be examined at several famous localities in America, such as Obsidian Cliff at the Yellowstone Hotspot (northwestern Wyoming, USA) and Big Obsidian Flow at the Newberry Volcano (central Oregon, USA).
Obsidian is moderately hard and has a conchoidal fracture (smooth and curved fracture surface), with sharp broken edges. Freshly-broken obsidian has the sharpest edges of any material known, natural or man-made (as seen under a scanning electron microscope).
Obsidian forms two ways: 1) very rapid cooling of lava, which prevents the formation of crystals; 2) cooling of high-viscosity lava, which prevents easy movement of atoms to form crystals. An example of obsidian that formed the first way is along the margins of basaltic lava flows at Kilaeua Volcano (Hawaii Hotspot, central Pacific Ocean). Most obsidian formed the second way.
Seen here is flow-banded gray obsidian - an unusual color.
Locality: unrecorded
Howard William Gray at 7 months of age. In a group of photos from Wisconsin and Michigan. AZO stamp box dates to 1910-1930. RPPC.
505 (EU62 BYR) is a 2012 Volvo B5LH fitted with an Wrightbus Eclipse Gemini 2 10.5 metre 71 seat body. It was new to Ensignbus.
Ensignbus 505 on route 22 at Lakeside Bus Station in Grays, Essex on Tuesday, September 24th, 2013.
Cousin Dessie spotted this Gray Tree Frog resting on the guardrail of the Duck River Bridge. Humphreys County,Tennesse 10.5.2012
Westport, Washington
Standing 107 feet tall, the octagonal tower is the tallest lighthouse in Washington, and the third tallest on the West Coast. It went into operation June 30, 1898 and is listed on the NRHP.
It was featured on a US Postage stamp in 2007 honoring Pacific Coast lighthouses.
Perisoreus canadensis
Gray Jay or Camp-robber
Order Passeriformes
Family Corvidae
THey are well adapted to the North Cascades, this bird was out and about in the snow.
DSCN7736b
Vireo vicinior
Munds Wagon Trail, Coconino National Forest, Coconino County, Arizona, USA.
P530_0512
Eastern Gray Squirrel_Sciurus carolinensis, are frequent visitors to my birdfeeder. However, they can't climb the metal pole, so they wait for seeds pecked or scratched out!
I guess Quentin's been good about not bothering the kittens, but he did sniff them a few times while they were out.
This one is to prove I say ( www.freeminding.org/blog/archives/2005/01/10/gray-milan/ ) the truth! ;)
Northern Harrier - male
Circus cyaneus
I've seen a ton of immature and/or female Northern Harriers, but it's a rare treat to see an adult male - the so-called "Gray Ghost". This was one of those opportunities, and I still didn't get a great one. But I'll take it - they are just magnificent to see in the air.
FIELD MARKS- dark gray overall black cap long,black tail, often cocked undertail coverts chestnut short, dark bill