A reddish-brown pebble with smooth surface

[debodun]

I was directed to this forum after posting in another. This is a reddish brown pebble, 1.75 inches long weighing 2 ounces. Cannot be scratched with a nail file, but it doesn't scratch glass. It also has a thin white vein of another type of rock on one side. Very much resembles a piece of stew beef with fat marbling. I picked it up in a gravel-paved parking lot in Rensselaer County in New York, but being paving material, could have been transported from anywhere. I am curious what it is. Thank you.

 

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[DDancer]

Brown jasper with quartz seams. The hardness is about 7 I'd say that is usually hard enough to scratch most glass but glass and silicate's like yours have very similar hardness's and are of similar material. Its also a bit harder than a file, files usually are about 6.5 to 7. The smooth luster is what gives it away.

 

[debodun]

Thank you.