Did a scratch test and it's harder than glass, because it scratches the glass without leaving any visible damage to the stone.
I'm inclined after looking at it thru a 10 power Loupe, and comparing it with details on wikipedia to think that it's possibly a small rough diamond, because of some evidence under magnification on one of the faces, showing trigons (of positive and negative relief) formed by natural chemical etching as detailed in a wiki entry about identifying diamonds.
I've had a lot of quartz crystals in my time and this doesn't appear to be quartz to me.
That said - I did find historic mention of a diamond discovery in the Pilbara back in the late 1800s when Gold was first discovered there.
We of course all know about the Argyle Diamonds in the Kimberly.
However there's not much mention of diamonds anywhere in the southwest - so I need to do some positive ID of this little sucker.
That could prove tricky.
Obviously I'm not keen to divulge the place as yet - at least until I look and see if there's any more hanging about in the same place. It was the most brief of visits!
Spectroscopy is possibly one of the most proof positive ways to find out....not sure where I could get that done here in WA?.
The flat bed scan against white paper posted here doesn't do it justice compared to natural daylight and looking with a 10 power Loupe.
In daylight the colors more of a blue grey than the brown depicted with the scanner light source and exposed for 18% grey which makes it look brownish in color.
Interestingly up to 80% of the Argyle Kimberley Diamonds are brown - they were not considered gem quality until recently with the marketing of "argyle pink diamonds" which are really just one of the shades of brown but now considered gem quality as buyer acceptance has crept into the market place.
In years past Brown diamonds were mostly all used for industrial purposes.
So - where to from here?
How to find out for sure - and then what do I do, if there's more?
Heck I just went looking for a little gold color - I wasn't looking for diamonds.....I was just about to throw the first shovel full of gravel away, in disgust that I couldn't find even a hint of gold color, and the very last little lump of gravels I dispersed with my finger - produced the little sucker depicted.
I figured what it might be pretty much straight away - I've watched a few shows about grading argyle diamonds on the idiot box before today and thats what made me decide to pocket it for later investigation.
Maybe I better go thru my bucket of gravel sample and see if it has any mates in there!.
Anyone an expert in identifying diamonds in the rough?
How many of you keep an eye out when prospecting & detecting for anything but Gold?
My interest levels have now gone up noticeably in the last 24 hours.
And that's without finding any Gold yet!
Whats the saying again?
All that glitters is not necessarily gold!
Diamonds are a girls best friend!.
I'm pretty sure it's not broken glass after the scratch test, but there are possibilities besides diamond of course.
I'm not in a position to do thermal conductivity tests.
Maybe a professor in the University who does minerology or something could tell?wrote: diamond identification relies on its superior thermal conductivity. Electronic thermal probes are widely used in the gemological centers to separate diamonds from their imitations. These probes consist of a pair of battery-powered thermistors mounted in a fine copper tip. One thermistor functions as a heating device while the other measures the temperature of the copper tip: if the stone being tested is a diamond, it will conduct the tip's thermal energy rapidly enough to produce a measurable temperature drop. This test takes about 23 seconds.
Whereas the thermal probe can separate diamonds from most of their simulants, distinguishing between various types of diamond, for example synthetic or natural, irradiated or non-irradiated, etc., requires more advanced, optical techniques. Those techniques are also used for some diamonds simulants, such as silicon carbide, which pass the thermal conductivity test. Optical techniques can distinguish between natural diamonds and synthetic diamonds. They can also identify the vast majority of treated natural diamonds. "Perfect" crystals (at the atomic lattice level) have never been found, so both natural and synthetic diamonds always possess characteristic imperfections, arising from the circumstances of their crystal growth, that allow them to be distinguished from each other.
Laboratories use techniques such as spectroscopy, microscopy and luminescence under shortwave ultraviolet light to determine a diamond's origin. They also use specially made instruments to aid them in the identification process. Two screening instruments are the DiamondSure and the DiamondView, both produced by the DTC and marketed by the GIA.
Or the Museum maybe?
Will be an interesting exercise finding out I guess.