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I purchased this rock at an estate sale along with some rose quartz. The sellers had no information on it. My husband was able to break it today with a hammer, but I have no idea what the material is. I'm new to this and wanting to learn.

The outside looks like a regular grey rock and had a bit of "orange" peaking through so I decided to break it and see what was inside. I tried the knife test and it doesn't really scratch it (it's very light and when you wipe it off there are no scratch marks). It weighs 661 grams, I couldn't find a ruler to measure it though. There is a small thin part that broke off and when held to the light it's like a foggy clear ( you can see an item's shape and color but the image is foggy). I'm located in Washington state and purchased the rock here, but don't know if it's from this area.

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This is the microcrystalline variety of quartz known as agate. It is very good for slabbing and cutting cabochons. It will take a high shine that is very durable making it suitable for rings and bracelets that see hard wear.

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Looks and sounds like a typical agate. The reddish-brown staining is likely iron oxide from the soil the agate was found in after it weathered out of the location where the agate originally formed in. Agates similar to the one you have can be found in any of the Western states, so it is possible that the Agate is local, though I have personally only found an agate with the horizontal banding like yours in New Mexico. The banding in the center looks like there may be some quartz crystals and there might also be some banding of common opal though I cannot tell from the photo. See this site for a description on agates with a Pacific Northwest feel to it.

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