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This rock was found in an area covered with approximately 200' of glacial till. The vein in the rock is partially oxidized. The rock is heavy; it shows some barely visible sparkle on its surface; the vesicles are all circular; and it is about 4" x 4". There is a bit of drozy (and also some lichen) in a few of the vesicles, and most of the pale green on its surface appears to be crystalized--perhaps it is olivine or remnants of fusion crust??enter image description here Any insights would be appreciated.

Location: found 3.5 miles south of the British Columbia border and 3 miles southwest of the northwest corner of Glacier National Park, Montana.

Elevation: 4300'

Surface rock: This was found on the surface, although it might have been dug up from approx. 1 foot below the surface from previous grading

Similarity to other rocks: I have lived at this local for 7 years and in this area for 20 years and I do not recall ever seeing something similar. The vesicles are unique and most hard rocks are rounded due to glacial wear. Most of the rocks I have seen in this area are glacier-worn rocks (like river rocks), mudstones, fractured limestone, some vulcanic/lava rock (15 miles south of this location).

Hardness: does not scratch with a coin but does with a knife = 5

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This looks like limestone with erosion holes and a vein running through. Studying the stratigraphy of the Glacier National Park shows limestone deposits at the height of 4300'. See here

There are tons of pictures of erosion holes so please google this on your own. They are really common, especially in sandstones and limestones.

So this is definitely no meteorite, sorry.

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  • $\begingroup$ If this is limestone, shouldn't it react to vinegar? I have poured vinegar over the rock and have seen no reaction. $\endgroup$ – James Feb 14 at 18:04

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