Can anyone help me identify the rock i have found?

it was found in lower south west WA. it is green in colour, seems to be quite dense - i can not see the particles in it. It has a Glassy appearance but is more "layered" than melted glass would look. It is hard enough to scratch metal. I found three chunks roughly the size of a grapefruit bit bigger.

Can anyone help me identify the rock i have found?
Not really sure there are a couple it may be I am thinking Tourmaline. But since you have the samples in question refer here and tell us what it really is please.
Reply:well you need to try and scratch glass with it. its hardness is key in figuring out where it lies on the Mohs scale. whether or not it scratches metal doesnt matter.





The Cascade Mountains are in the area and more fitting the Western Cascades are heavily eroded b/c of the large amount of preciptation it recieves (60-100 inches yrly)





The Cascade range formed through a sseries of volcanic episodes beginning aprx 40 mya. The entire range is predominatly made up of volcanic or igneous rock (see link for characteristics)





Without seeing your specimen its impossible to know but start out with identifying general characterisitcs: physical properties, see if you can identify specific minerals in the rock, how large are the grains? Texture? You say it has a cleveage (layered structure), notice its color and match that to minerals (google it if you dont have a textbook).





I would surmise being the region that its in and what Im familiar with....





the glass-like appearance could be biotite mica or muscovitemica (it has a good cleveage)


The green color--who knows without seeing it BUT olivine and pyroxene both are green (google those to see differences)


Im sure there is some feldpsar in there somewhere





All these are typical minerals related to igneous rocks.





You really need a microscope to determine grain size and mineral composition





Try going to your local college or university, Im sure those geology professors would be more than excited to help you!





Its certianly impossible to tell from here!!
Reply:It could be Jade or obsidian, because they both have a glassy appearance and could have layers in them.
Reply:probably a furnace clinker of glass from burning coke or coal
Reply:could it be a copper thing?

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