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49,128 users

I need help in identifying .

0 votes

At 70 I still have my collection from when is was ten. Over the years labels were lost. If I could get some help it would be greatly appreciated.

asked Jan 15 by Cappo (140 points)

1 Answer

0 votes
Okay, let's start by asking some questions.

 First, the brown stone. The smooth surfaces, do they feel waxy. If you have agate or chert or chalcedony in your collection, I want to know if the brown rock feels the same way.

Second, if you take a pocketknife, or a nail, does it scratch the rock? Iron is about 5.5 on the mohs scale, most silicates are around 7.0. The iron will not mark it

Lastly, if you put a strong light source behind it, does the rock allow some of the light to pass through it? Is it translucent?

There are more things you can do to assist in this identification. If you have a magnet, is either stone magnetic?

If iron scratches either and the rock is brittle that will also tell us more

Looking forward to your answers.
answered Jan 17 by Weasel (57,990 points)
Sorry, was in Florida. It is heavy and magnetic. Knife won't scratch it. It is not brittle, and the underside appears to be from the iron family
Most likely would be describing magnetite. All the descriptions you mentioned indicate as such. Can you also test the streak?

Please see https://www.minerals.net/mineral/magnetite.aspx for more information on magnetite.
 


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