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I hope I'm not posting too much. This piece was given to my mom years ago so I have no idea where it came from. It is heavy for it's size. Feels like hematite but it has this strange embedded stone in it.

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What color is the streak?

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Do they seem to be man-made carvings/markings? Or more like a fossil?

Very neat in any case.

Someday I hope to be more helpful!!

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Looks like a fragment of botryoidal hematite to me. Could be a few other things though. 

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augite, color, brown green; black; green-black; brown purplish brown.

cleavage- distinct/good on (110) degrees.

streak- greenish gray, light to dark brown.

hardness- 5-6.5

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like mentioned do streak test, hematite would leave a reddish streak.

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7 hours ago, fuss said:

like mentioned do streak test, hematite would leave a reddish streak.

I don't have a streak plate. Is there another way to do this test?

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7 hours ago, wet/dry washer said:

augite, color, brown green; black; green-black; brown purplish brown.

cleavage- distinct/good on (110) degrees.

streak- greenish gray, light to dark brown.

hardness- 5-6.5

What D_day said then? botryoidal hematite? I googled that and it does look like it. Like someone carved away at it to expose the inside.

Edited by Cheshirecat

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Use a file.

File some shavings onto s piece of white paper. Smear it with your finger. All a streak test does it determine the color of a particular minerals powder. I suspect it will be reddish brown.

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1 hour ago, Cheshirecat said:

What D_day said then? botryoidal hematite? I googled that and it does look like it. Like someone carved away at it to expose the inside.

Doesn’t look like anyone’s carved it to me. Looks like it was broken by geological pressures and lots of time. If my ID is correct, the stone in the middle is a remnant of whatever it formed on. It could be other minerals too. If you do a streak test and the streak is brownish black, then it’s probably psilomelane. 

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4 hours ago, Cheshirecat said:

I don't have a streak plate. Is there another way to do this test?

Underside of porcelain toilet tank lid

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3 minutes ago, Stillweaver hillbelli said:

Underside of porcelain toilet tank lid

Thanks! The outside part leaves a red streak and inside is a darker, more brown red streak.

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Hematite.

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