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Is this sea glass, mineral, or mystery?

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By no means am I a sea glass expert or even an amateur. But I have seen sea glass, which is why I begin here. This item was found on a small shore on the Rappahannock River in Virginia.  Size: 1 7/8" at longest side, 1/2" thickness.

Reasons it may be sea glass:

            It is somewhat translucent, though more so on the edges. 

It is a striking blue color, as glass can be, and I have no idea what rock/stone can have such a vibrant natural color here (VA).

It has a very interesting triangle shape that does not look natural to me, as it has an even ½” thickness on the edges.

Reasons it may NOT be sea glass:

The tips of the triangle shape are more yellow/brown-blue than blue, while the middle is a very dark blue (pics are true to color). The item loses its translucency towards the middle, and becomes very opaque. Very true to pics.

The soft parts have small but smooth bumps like stippling. NOT as smooth as frosted sea glass. Nor does it seem to really have a frosted look about it.

It has some type of sediment/orange rock layer that is very hard and will not chip off. Between the blue item and this orange layer seems to be pyrite. I have never seen glass with rock/sediment adhered to it…

There are spots that seem almost like streaks breaking through into the opaque middle part, which I don’t think occurs in glass…

Any clue what this may be?

My husband thought it may be quartz with cobalt pigment, but we don’t know if that happens naturally…

Any ideas would be helpful!

asked Sep 25, 2016 by Indy (120 points)

1 Answer

0 votes
I don't know what it is, but I have some suggestions:

Do a hardness test on the translucent part. This will quickly determine if it is quartz or glass

As for the blue color, this have happened via long term exposure to copper. As a future reference, green and blue color is normally caused by copper; red, orange, and yellow coloring is usually caused by iron

Good Luck!
answered Aug 4, 2018 by linkisnotzelda (5,370 points)

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