What is This?

HayJude69

Newbie
Jan 26, 2022
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Good Evening, This rock was found in New Jersey by one of my farmer relatives and has been in my family for as long as I can remember. It went back and forth to Geology class as a "show and tell" rock by all the children. No one could "tell" or identify what type of rock it is. The rock is covered in a rainbow of various colors. Can anyone identify this EBE55AFF-8594-45A9-A993-66D4FF133431.jpeg 498EF31C-1515-4E53-B4EF-984894ADD1B1.jpeg rock?
Thanks!
Jude
 
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MountOlymp

Jr. Member
Jul 16, 2021
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Good Evening, This rock was found in New Jersey by one of my farmer relatives and has been in my family for as long as I can remember. It went back and forth to Geology class as a "show and tell" rock by all the children. No one could "tell" or identify what type of rock it is. The rock is covered in a rainbow of various colors. Can anyone identify this View attachment 2006098 View attachment 2006097 rock?
Thanks!
Jude
Slag
 

traveller777

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Aug 20, 2017
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Agree! Also known as 'rainbow' hematite. It's usually hematite in admixture with goethite.

Your (nice) specimen is natural. but most of what passes for 'irirdescent hematite' as polished material in rock&gem outlets is man-made.

Welcome to Tnet.
Pretty good analysis without knowing hardness or weight. Impressive.
 

Back-of-the-boat

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I never knew that hematite had that look but after seeing it in pictures on the web I agree and funny thing is I have some in a curio cabinet that I found in an old gold mine I was exploring. I thought it was a type of peacock ore but now I believe it is iridescent hematite.
 

Red-Coat

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Dec 23, 2019
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What is peacock ore? Can I sell this rock?

Peacock ore is principally the mineral "bornite", a complex of copper and iron sulphides that's red-brown on fresh surfaces and often weathers and tarnishes to iridescent colours after exposure... but that isn't what you have. It has the wrong crystal habit for bornite... but the right crystal habit for hematite. Rainbow hematite acquires its surface colour from a very thin deposition of an aluminium phosphate.

Neither bornite nor rainbow hematite have any particular value in 'specimen-size' pieces and would cost you only a few dollars from a rock&gem shop. Both can be rather pretty and popular with collectors though.
 
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HayJude69

Newbie
Jan 26, 2022
3
11
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Peacock ore is principally the mineral "bornite", a complex of copper and iron sulphides that's red-brown on fresh surfaces and often weathers and tarnishes to iridescent colours after exposure... but that isn't what you have. It has the wrong crystal habit for bornite... but the right crystal habit for hematite. Rainbow hematite acquires its surface colour from a very thin deposition of an aluminium phosphate.

Neither bornite nor rainbow hematite have any particular value in 'specimen-size' pieces and would cost you only a few dollars from a rock&gem shop. Both can be rather pretty and popular with collectors though.
Thank you so much for this information! I really appreciate your response!
 

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