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 Post subject: Help identifying.
PostPosted: Sat Jun 01, 2019 6:28 pm 
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I've had this rock for 20ys it was found in Sydney Australia I'm curious what it actually is.


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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 1:40 am 
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looks like quarz to me...

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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 5:09 am 
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Thanks for that it has rainbows and it looks like fossils or something. I should get it checked out professionally.
Thanks


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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 10:57 am 
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It is quartz.
No fossils; it contains inclusions of other minerals.
The Quartz Page wrote:
Rainbow or Iris Quartz
There are two types of quartz crystals that are called rainbow or iris quartz.

One is fairly common: Quartz crystals often show cracks running through them, usually caused by mechanical stress, and these sometimes show rainbow-colored reflections. Due to the conchoidal fracture of quartz the cracks are curved and the width of the fissure is not the same over the whole extent, but changes gradually. The cracks are usually very thin, and often just filled with air. Light that passes through the crack will get partially reflected on both walls of the crack. If the width of the crack is of the same order of magnitude as the wavelength of light, both reflected light beams will show interference colors: Parts of the spectrum will be canceled out, and the reflected light appears colorful. The color depends on the width of the crack and the angle at which the light passes the crack. As the width of the crack changes gradually, so does the color and this causes a rainbow-colored reflection. This effect is known as iridescence (hence the name iris quartz) and can also be observed when thin layers of oil swim on water.
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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 4:57 pm 
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Normally you can't identify stones 100% from a photo, but this is one of those rare exceptions. The color and crystal form are extremely distinctive. The only thing it could be other than quartz is an extremely sophisticated fake meant to imitate quartz, which doesn't seem likely.

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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 6:49 pm 
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It's definitely real it was found in deep excavation work on the edge of Sydney Harbour. Thank you so much for your help.


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 Post subject: Re: Help identifying.
PostPosted: Mon Jun 03, 2019 8:12 pm 
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Quartz, natural Citrine.


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