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Light Blue Mineral with VERY low hardness

Posted by Daniel jacobs  
Daniel jacobs June 11, 2012 05:33AM
Mineral was found in Portland, Connecticut in 2002.

I tried searching, but there are just too many minerals in that area to pinpoint.

Mineral is brittle, just during the scratching process, 2 small pieces broke off.
Mineral can be scratched by Calcite (3)
Mineral can scratch my fingernail (2)
open | download - blue.jpg (65 KB)
open | download - blue1.jpg (58.2 KB)
open | download - blue3.jpg (58.2 KB)
Vik Vanrusselt June 11, 2012 06:31AM
This looks like Calcite to me. Try a drop of acid on it and see if it bubbles.

Eligiusz Szełęg June 11, 2012 08:23AM
blue calcite
Jeremy A. Zolan June 11, 2012 08:31AM
This looks like calcite. Try the acid test described above. Slight to moderate effervescence can also be observed if a small sample of the mineral in question is finely powdered and placed in hot vinegar although muriatic acid (HCl) produces a far more obvious result upon reaction with carbonates. Like the peridot you found, I believe this specimen is most likely from a foreign location. I have not seen this habit of calcite associated with central Connecticut pegmatites. Calcite is also quite rare in felsic environments. Be careful...
Uwe Ludwig June 11, 2012 01:07PM
Coelestine has a hardness of 3 and shows sometimes a blue colour.

Uwe Kudwig
José Zendrera June 11, 2012 03:05PM
To me, looks as calcite but could be also celestine (similar hardness, also 3 cleavage planes...).
You can check density to differentiate calcite (2,7) from celestine (3,8) in this easy way:,11,250282,250583#msg-250583

Peter Haas June 11, 2012 08:50PM
Do a flame test with one of the pieces that broke off in your scratch test. This should be conclusive enough in this case.
Daniel jacobs June 11, 2012 10:07PM
It is calcite! From Gouvenour NY.. I found a piece of paper deep in my closet. It only makes sense that it is this!
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