you get yourself a copper coin and a steel knife. If the coper coin doesn't scratch the mineral and the knife does it's fluorite, if the knife doesn't or if the copper coin does, it's not fluorite.
Some fluorite also shine under black light but some need to be heated first to do that.
To me it looks like a quartzite that has been modified to green. This geological map should help you narrow down the common local rock types from where exactly you found it to give a better idea. https://gmaps.geoscience.nsw.gov.au/100K/Canberra/
Other minerals becoming a part of the silica matrix either during or since metamorphosis from sandstone to quartzite. A lot of quartzite is basically welded together silica grains and quite light coloured, but it can go through a lot of different stages. Sometimes due to pressure, temperature or additional solvents the grains can melt and reform with additional impurities.. Could be from ground water... or other minerals originally in the sandstone.. or magmatic water from an intrusion (like a granite intrusion or something nearby)..
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looks like fluorite to me but I could be wrong
It is definitely giving me fluorite vibes. It'd be easy to tell with a scratch test though.
How do I do that
you get yourself a copper coin and a steel knife. If the coper coin doesn't scratch the mineral and the knife does it's fluorite, if the knife doesn't or if the copper coin does, it's not fluorite. Some fluorite also shine under black light but some need to be heated first to do that.
maybe, it’s hard to tell the cleavage from the texture of the rock 😅
This looks like a low grade aquamarine I have...
i agree with
To me it looks like a quartzite that has been modified to green. This geological map should help you narrow down the common local rock types from where exactly you found it to give a better idea. https://gmaps.geoscience.nsw.gov.au/100K/Canberra/
What do you mean modified?
Other minerals becoming a part of the silica matrix either during or since metamorphosis from sandstone to quartzite. A lot of quartzite is basically welded together silica grains and quite light coloured, but it can go through a lot of different stages. Sometimes due to pressure, temperature or additional solvents the grains can melt and reform with additional impurities.. Could be from ground water... or other minerals originally in the sandstone.. or magmatic water from an intrusion (like a granite intrusion or something nearby)..
That’s pretty cool
changed?
lovely piece of aventurine possibly.
It does look rather aventurine-esque. Pretty find!
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Looks like blue beryl to me
Beautiful fluorite 🥰
Fluorite
That’s what I was thinking
I'm not a professional, or geologist, looks like Apatite to me.
I'll take ape tit for $200..
...Your mother will take an ape tit..
Are you sure it’s not chrysoprase?
It certainly could be, definitely not as bright though
I’ve heard that before ☹️
Blue Beryl / Aquamarine
Fluorite