Cheshirecat 20 Posted September 18, 2019 Share Posted September 18, 2019 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. 1 Quote Link to post Share on other sites
Morlock 1,637 Posted September 18, 2019 Share Posted September 18, 2019 What color is the streak? Quote Link to post Share on other sites
Sonja 3 Posted September 18, 2019 Share Posted September 18, 2019 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!! Quote Link to post Share on other sites
d_day 326 Posted September 19, 2019 Share Posted September 19, 2019 Looks like a fragment of botryoidal hematite to me. Could be a few other things though. 1 Quote Link to post Share on other sites
wet/dry washer 197 Posted September 19, 2019 Share Posted September 19, 2019 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 Quote Link to post Share on other sites
fuss 40 Posted September 19, 2019 Share Posted September 19, 2019 like mentioned do streak test, hematite would leave a reddish streak. Quote Link to post Share on other sites
Cheshirecat 20 Posted September 19, 2019 Author Share Posted September 19, 2019 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? Quote Link to post Share on other sites
Cheshirecat 20 Posted September 19, 2019 Author Share Posted September 19, 2019 (edited) 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 September 19, 2019 by Cheshirecat Quote Link to post Share on other sites
Morlock 1,637 Posted September 19, 2019 Share Posted September 19, 2019 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. Quote Link to post Share on other sites
d_day 326 Posted September 19, 2019 Share Posted September 19, 2019 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. 1 Quote Link to post Share on other sites
Stillweaver hillbelli 272 Posted September 19, 2019 Share Posted September 19, 2019 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 Quote Link to post Share on other sites
Cheshirecat 20 Posted September 19, 2019 Author Share Posted September 19, 2019 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. Quote Link to post Share on other sites
Morlock 1,637 Posted September 19, 2019 Share Posted September 19, 2019 Hematite. 1 Quote Link to post Share on other sites
Bedrock Bob 3,960 Posted September 22, 2019 Share Posted September 22, 2019 Hematite for sure. Quote Link to post Share on other sites
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