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Identity HelpUnknown mineral found in sandstone (Sydney Basin, NSW)

21st May 2026 04:09 UTCYash Redkar OP

05906230017793365421376.jpg
Due to the extremely tiny size I couldn't reliably test it against glass (FOV <1mm). The matrix is Permian sandstone, I found it in Wollongong, New South Wales, Australia, during a fossil hunt at Flagstaff Point in Wollongong. I suspect it is a very tiny zircon crystal? 

Questions Answered
Can it scratch glass? : Unable to test
Can you scratch it with your fingernail? : No
Is it light/heavy for the size? : Unable to test

21st May 2026 04:09 UTCYash Redkar OP

08694340017793365668442.jpg
Another isolated patch. It was only found in one area, near a fossil plant.

21st May 2026 05:50 UTCWayne Corwin 🌟

Yash Redkar OP  ✉️

Due to the extremely tiny size
 ?

21st May 2026 06:16 UTCYash Redkar OP

FOV= <1mm.

21st May 2026 06:19 UTCHamza Ilhan Sito

Have you tried poking it with a needle? you should be able to no?

21st May 2026 09:15 UTCYash Redkar OP

Sewing needle could not scratch it.

21st May 2026 12:24 UTCWayne Corwin 🌟

Garnet maybe?

21st May 2026 18:07 UTCUwe Kolitsch Manager

Superficially oxidised pyrite?

21st May 2026 21:52 UTCYash Redkar OP

Hi Uwe, the first photo shows a good crystal shape, it is not pyrite.

22nd May 2026 06:20 UTCKeith Compton 🌟 Manager

Just checking FOV - is the "crystal 1mm or only around 0.25mm  (i.e. the whole photo is 1mm across)?

Pyrite can have various crystal forms and your photo appears to be a cluster with effectively only one or maybe two faces visible.

Certainly could be either ilmenite or hematite

22nd May 2026 00:58 UTCPaul Carr

The local sandstone forms the upper part of the Permian Broughton Formation which is a marine unit composed of locally-derived basaltic fragments and minerals derived from the breakdown of the basalts. Hematite and magnetite are common components.

 

22nd May 2026 12:29 UTCWayne Corwin 🌟

Maybe more pix would help Yash.

22nd May 2026 13:33 UTCYash Redkar OP

I'll try get some more soon!

22nd May 2026 13:45 UTCWayne Corwin 🌟

Is it translucent or transparent or solid?

22nd May 2026 13:46 UTCYash Redkar OP

Translucent 100%. Also has a very distinctive coppery shine. Have found a few more patches on the sandstone behind pieces of a plant fossil I extracted (the only time I found both this mineral and graphite at the locality), so I can share pics soon.
 
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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