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Hi ,

I found this yellow stone.

Is very hardness. Quartz not scratched but in opposite this stone scratch the quartz. 

Also no any damage after i try to scratched with diamond disk by hand with medium power. (no machine) 

First i have in my mind this stone is a citrine or yellow opal or something similar.

Now i don't know.

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You have either citrine, heliodor or topaz. Glass is also a distinct possibility.

 Can you give a more precise location as to where it was found?

 

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41 minutes ago, Morlock said:

You have either citrine, heliodor or topaz. Glass is also a distinct possibility.

 Can you give a more precise location as to where it was found?

 

Hi Morlock,

In the same area where i found all the other rock , where i go the dog walk near to my house.

Glass is not possible, also citrine, topaz maybe because is hardness.

Look i give photos with new test with diamond disk.

thanks

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Posted (edited)

So, one test with diamond disk up to the stone with photos.

The disk is new.

First photo before the use of the disk. 

Second after i work the disk by hand up to stone .

Third after i clear the stone.

And one more with sun lights.

In the last one you can see the place where i use the diamond disk , is dirty but not any scratch.

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Edited by ivigo

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Looks like a run of the mill agate to me. Several of the pictures show a seam between the two halves. The last photo shows some faint banding near the top. 

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Posted (edited)
52 minutes ago, d_day said:

Looks like a run of the mill agate to me. Several of the pictures show a seam between the two halves. The last photo shows some faint banding near the top. 

Sorry , but if that is agate, the diamond disk they scratched like a butter.(ok , not exactly hahahha)

This agate is from the same area and the disk scratched a lot. The photo is not good ....i lost the sun light.

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Edited by ivigo

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Its not a diamond or corundum.  Your blade did scratch it.  It is just a piece of weathered quartz, maybe weathered feldspar.

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1 hour ago, 4meter said:

Its not a diamond or corundum.  Your blade did scratch it.  It is just a piece of weathered quartz, maybe weathered feldspar.

Hi, for which of the two rocks- stone you say?

The blade is diamond, and scratch this second one and one clear quartz i have.

They didn't scratch the yellow one, so this stone is not possible to be a quartz because this stone scratch the clear quartz and for sure is not feldspar.

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It looks like a feldspar that popped out of a volcanic rock. Bytownite or something similar.

It is a neat rock. It has clarity. It would be worth tumbling. If it is bytownite, and it very well could be, it is a valuable find. A few bucks anyway. And there is probably more to be found.

You are misinterpreting your hardness test. But you did find a cool rock.:party-smiley-027[1]:

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10 minutes ago, Bedrock Bob said:

It looks like a feldspar that popped out of a volcanic rock. Bytownite or something similar.

It is a neat rock. It has clarity. It would be worth tumbling. If it is bytownite, and it very well could be, it is a valuable find. A few bucks anyway. And there is probably more to be found.

You are misinterpreting your hardness test. But you did find a cool rock.:party-smiley-027[1]:

Hi Bob, how can happen this with my hardness test?

The test is clear and i put photos about it.

This yellow stone scratch clear my quartz stone (serrated crystal) also and the diamond blade make the same, but quartz stone and diamond blade they didn't scratch the yellow stone.

So, what a  mistake i make?

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Posted (edited)
3 hours ago, ivigo said:

In the last one you can see the place where i use the diamond disk , is dirty but not any scratch.

You get what you pay for.

True diamond scratches everything.

Did you see the message on the disk,

" breath every 80 seconds!"?:WOW::tisk-tisk:

Edited by Stillweaver hillbelli

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Posted (edited)
1 hour ago, Stillweaver hillbelli said:

You get what you pay for.

True diamond scratches everything.

Did you see the message on the disk,

" breath every 80 seconds!"?:WOW::tisk-tisk:

https://suneuropa.com/en/hand-tools/tools-for-drilling-and-cutting/diamond-cutting-discs/continuous-rim-diamond-saw-blade-125mm.html?SubmitCurrency=1&id_currency=2

I know true diamond scratch everything and for sure if  i put more power to my hand they scratch and the yellow stone.

But i put the same power as i put when i make the test to my clear quartz test stone.

So, the yellow stone scratch the quartz, the same and the diamond, so the yellow stone is for sure 7,5 to 8 hardness.

Now the diamond not scratch the yellow stone and for sure is hardness but we don't know exactly how much.

In opposite, i polish a small area in the stone  with 220 silicon carbide ( 9,5 hardness ) sand paper with  wheel electric tool .

So, i polish the area very difficult but the silicon carbide  it started to burn .

I have a good tools because i work a lot with them.

Edited by ivigo

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1 hour ago, ivigo said:

 

So, the yellow stone scratch the quartz, the same and the diamond, so the yellow stone is for sure 7,5 to 8...

My vote is for topaz:ya: since it scratches your quartz.

Bytownite should not do that based on the Mohs hardness scale.

But scratch tests can be deceptive if your examination is not critical.

Make sure you breath(e) every 80 seconds:)

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Posted (edited)

Hi, after a lot of time and hard work with silicon carbide , 60,120, 400,and 800 sand paper in wheel machine i polish a big part of one side of the stone.

The Refractive luster of stone  is super duper huge and metallic .Without a properly polishing is like the luster of Hematite or metal .

It's like a mirror you can see your face inside....hahahaha. Really i show the reflection of my finger.

Tomorrow i take photos to show it here.

Thank's

Edited by ivigo

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I would leave open the very, very unlikely possibility that the sample is topaz, but...  I blew up your photos of the scratch test.  It clearly shows the sample gouged out and "white" dust along the gouges.  It also shows a metallic streak on the sample.  Your diamond blade has a small amount of tiny, industrial grade, diamonds embedded in lots of alloy.  The diamonds, gouged out spots in the sample and left the gouge and white dust, the alloy, being softer than your sample, smeared on the sample leaving the metallic streaks.  I stick with quartz or feldspar.  Nothing seen so far to point to an exotic like topaz or other hard minerals.

I stopping trying to use blades or mineral fragments to do hardness tests; the results were never easy to see.  Get a Moh's hardness test kit (metal tipped points that are calibrated) 

for tile testing from Amazon (when in stock) or a tile supply store; they are worth every penny if you do a lot of rock/mineral hunting.

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6 minutes ago, 4meter said:

I would leave open the very, very unlikely possibility that the sample is topaz, but...  I blew up your photos of the scratch test.  It clearly shows the sample gouged out and "white" dust along the gouges.  It also shows a metallic streak on the sample.  Your diamond blade has a small amount of tiny, industrial grade, diamonds embedded in lots of alloy.  The diamonds, gouged out spots in the sample and left the gouge and white dust, the alloy, being softer than your sample, smeared on the sample leaving the metallic streaks.  I stick with quartz or feldspar.  Nothing seen so far to point to an exotic like topaz or other hard minerals.

I stopping trying to use blades or mineral fragments to do hardness tests; the results were never easy to see.  Get a Moh's hardness test kit (metal tipped points that are calibrated) 

for tile testing from Amazon (when in stock) or a tile supply store; they are worth every penny if you do a lot of rock/mineral hunting.

Thank you for your answer.

I think is not a topaz, i think is something else. His luster is huge and reflect the light like mirror and not only the light , you can see reflecting things.

When the lights reflect to stone surface the results is a  huge metallic luster of surface where you can see things to reflect there. It's amazing.

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13 hours ago, ivigo said:

Thank you for your answer.

I think is not a topaz, i think is something else. His luster is huge and reflect the light like mirror and not only the light , you can see reflecting things.

When the lights reflect to stone surface the results is a  huge metallic luster of surface where you can see things to reflect there. It's amazing.

Exactly where do you live? I'm sure there's someone in your area that can identify it. It might someone from a rock and mineral club, a university, a jewelry store, etc. Someone in your area is very familiar with the geology and you should find out who it is.

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7 minutes ago, Morlock said:

Exactly where do you live? I'm sure there's someone in your area that can identify it. It might someone from a rock and mineral club, a university, a jewelry store, etc. Someone in your area is very familiar with the geology and you should find out who it is.

Hi Morlock, tomorrow i will going to a jewelry store, not only for the stone, i need to show something else, but i will take and the stone with me .

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Posted (edited)

Hi, i take some photos after i polish the stone . And after the polish the diamond blade scratch for sure the stone.

First photo is without sun light.

Second one with sunlight and my camera take makro photo with polarized result. 

Third one is without reflection of light.

Is easy to see the diamond scratch , but again no any scratch from quartz .

The need to found where i have my other gem samples ( ruby,  sapphire, diamond, etc) to make more easy a good hardness test.

 

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Edited by ivigo

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I think it is bytownite. It looks like it. The shape is right. Bytownite is mined in Greece. 

I think you are misinterpreting the hardness.

Someone in your area will recognize it and identify it for you. Seek out a local resource for advice.

I'll bet you a chunk of bytownite that it is a chunk of bytownite.

Polish a spot to 1000 grit and then scratch it with a piece of glass and then with a file. I bet the glass will not scratch it and the file will.

 

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It's hard to say for sure exactly you have. Until we have the correct hardness, it's just a guess. Then we'll be able to narrow it down.

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Posted (edited)

Hi Bob, is nice to try to help and thank you for this but for sure the stone have hardness up to 7 . I make test with different quartz more than 6 time and no one of them make any scratch to the stone still and after the polishing .

Something about the reflection luster? This type of stone  they didn't have metallic luster. 

Edited by ivigo

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I very seldom say this, but your latest photos have me convinced. I am 100% certain this is an agate.

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2 hours ago, ivigo said:

Hi Bob, is nice to try to help and thank you for this but for sure the stone have hardness up to 7 . I make test with different quartz more than 6 time and no one of them make any scratch to the stone still and after the polishing .

Something about the reflection luster? This type of stone  they didn't have metallic luster. 

Bytownite is a lot like labradorite. It has a spirit in it. Not really schiller but a luminescence. Some pieces show the labradorescence heavily. Some do not.

Bytownite or golden labradorite is about a 6.5 or so. Mighty hard for feldspar. You can't scratch it with glass but you can get it to scratch on a file.

It looks ike it formed in a gas pocket. I say this because of the cast surface. It is exactly like the bytownite crystals I am finding. And the shape is right. Those crystals fracture in cubes. 

But agate often has the same surface.

It could certainly be agate. But it has good even clarity. The hardness is about the same.

Bytownite has a conchoidal fracture as well as a blocky cleavage. Pressure will chip off a conchoidal flake. Impact will get it to spit along the feldspar planes. That is why your chunky shape has sides like that.

Agate breaks conchoidally. It has no cleavage planes. So broken agates rarely have faces that align. But sometimes they form in flows and sides do align. So it is really tough to tell.

Either way it is a nice rock. If it is agate it has great clarity. If it is bytownite it is a lot less common. Both are found in volcanic extrusive geology and can appear exactly like your rock.

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3 hours ago, d_day said:

I very seldom say this, but your latest photos have me convinced. I am 100% certain this is an agate.

I agree with you. I would place a significant wager that it is an agate.

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