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Is this zircon ?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Dimce Catle




Joined: 12 Nov 2017
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PostPosted: Nov 19, 2017 14:15    Post subject: Is this zircon ?  

HI everyone! My name is Dimce, I am 47 years old. I am from Macedonia and this is my new hobby. I found this mineral in an abandoned mine and I'm not sure if it's a zircon.
SG=4.625



2.jpg
 Mineral: Zircon?
 Locality:
Čanište, Prilep, Mariovo, Macedonia Republic
 Dimensions: 20mm-35mm-15mm
 Description:
 Viewed:  828 Time(s)

2.jpg



1.jpg
 Mineral: Zircon?
 Locality:
Čanište, Prilep, Mariovo, Macedonia Republic
 Dimensions: 20mm-35mm-15mm
 Description:
 Viewed:  842 Time(s)

1.jpg


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Josele




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PostPosted: Nov 19, 2017 15:28    Post subject: Re: Is this zircon ?  

Hello Dimce, welcome to FMF
Please read Asking: "What is this? / Where is it from?" and try to determine as many features as you can. With only these photos, our answers won't be very reliable. It will help a lot if you can determine the crystalline system by estimating angles between adjacent faces.

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Pete Richards
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PostPosted: Nov 19, 2017 17:50    Post subject: Re: Is this zircon ?  

Josele wrote:
Hello Dimce, welcome to FMF
Please read Asking: "What is this? / Where is it from?" and try to determine as many features as you can. With only these photos, our answers won't be very reliable. It will help a lot if you can determine the crystalline system by estimating angles between adjacent faces.

I agree about the importance of reading this posting about identification of minerals. I suspect that what you have is garnet, not zircon, and I am not sure from your images that any crystal faces are present - the surface looks more like one where one or more crystals have broken apart from each other.
Zircon is harder and more dense than garnet, but you would have to do a specific gravity test to use the density as a criterion to separate the two. Hardness requires seeing what minerals will scratch other minerals or materials of known hardness, and may be difficult to apply in your case.

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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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Jordi Fabre
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PostPosted: Nov 19, 2017 18:03    Post subject: Re: Is this zircon ?  

Considering the locality I would say Corundum.
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Dimce Catle




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PostPosted: Nov 20, 2017 13:03    Post subject: Re: Is this zircon ?  

Sorry, Gentlemen! I tried a hardness test but it breaks down into small pieces. I didn't see any crystal faces, maybe there was too much damage from the blasting.
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Dimce Catle




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PostPosted: Nov 20, 2017 13:24    Post subject: Re: Is this zircon ?  

It's not a corundum, I have a beautiful piece of corundum from Sivec mine, Prilep, Macedonia


2.jpg
 Mineral: Corundum
 Locality:
Sivec Quarry, Sivec Mountain, Prilep, Mariovo, Macedonia Republic
 Dimensions: 42mm-40mm-18mm
 Description:
 Viewed:  609 Time(s)

2.jpg



1.jpg
 Mineral: Corundum
 Locality:
Sivec Quarry, Sivec Mountain, Prilep, Mariovo, Macedonia Republic
 Dimensions: 42mm-40mm-18mm
 Description:
 Viewed:  611 Time(s)

1.jpg


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lluis




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PostPosted: Nov 20, 2017 15:19    Post subject: Re: Is this zircon ?  

Hi, Dimce

I still think same as Jordi, probably corundum....
Corundum could have many colours...

Anyway, if you have a precision scale, you could test density, and that could give an idea...
You have already some fragments... Then, you could do this using the fragments....

Or you could do some chemical tests....

With best wishes

Lluís
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Pete Modreski
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PostPosted: Nov 20, 2017 15:47    Post subject: Re: Is this zircon ?  

I agree, that this looks more like garnet than anything else.

Here is a suggestion, if you know someone who has access to both a short and a long wave ultraviolet light. Examine it for fluorescence. Almost all ruby fluoresces red under long-wave ultraviolet. Most (not all, but much of it) zircon fluoresces yellow, best seen under short-wave ultraviolet. And garnet (especially any reddish garnet) is not fluorescent at all.
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Dimce Catle




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PostPosted: Nov 20, 2017 18:11    Post subject: Re: Is this zircon ?  

Тhanks lluis and Pete, I have a scale of 0.01-100g. and I did a SG test and got a SG = 4.625. Zircon (4.6-4.7)
Next I will do the UV test. There is no reaction with HCl
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cascaillou




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PostPosted: Nov 30, 2017 13:04    Post subject: Re: Is this zircon ?  

I wonder if your SG measurement is correct? Did you use a fragment of the mineral without attached matrix or other associated minerals? what was the weight of that fragment and what's the accuracy of your scale?.
Indeed, in regard of the appearence of your specimen, several minerals (mostly monoclinic or orthorhombic) reported from Prilep sound more likely than zircon, but these fall within lower SG ranges than what you reported.

Also it seems your specimen shows cleavage planes in at least two directions, and maybe that's just the picture but the lustre seems slightly resinous, and the brown color seems to have a slight pinkish/reddish hue, is that correct?

Does the specimen scratch glass (from a mirror for instance)? Does it scratch the facet of a quartz crystal?

Do you have polarizing sunglasses on hand? Or maybe a broken LCD screen (from a broken TV, computer or smartphone)?
In which case you actually have a polariscope on hand and thus you could test optical properties from a tiny transparent fragment (you could easily check whether the stone is isotropic or anisotropic...and with a little more efforts, you might possibly also be able to tell if uniaxial or biaxial using a 10x loupe as a conoscope)

With a 10x loupe, you could also check for doubling (of the facets, fractures or inclusions) which would be a sign of anisotropy and high birefringence.
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