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Identity HelpBlue stone from Lanzarote

17th Jan 2020 13:25 UTCWendy van de Wouw


I found this stone 3 years ago on the island Lanzarote, Spain.
First I thought it was lava with Azurite, but when i took this to a mineral show and collectors looked at it under a microscope, they said it isn't azurite. But also they could not name this stone.

Does anyone know?

Ps. I make jewelry, so my nails aren't pretty anymore, sorry about that haha.

17th Jan 2020 13:26 UTCWendy van de Wouw

And a photo

17th Jan 2020 14:54 UTCJosé Zendrera Expert

The only blue mineral I know from Canary Islands is haüyne but normally is found in much smaller size and different looking. Please see:
I don't think it's haüyne but to discard it you can check fluorescence under long wave UV, Canaryan haüyne turns to orange color under this wavelength: 

17th Jan 2020 15:27 UTCDavid Carter

Could it possibly be resorbed blue Azurite where the resorption of the Azurite has occurred during crystallisation as the mineral was initially forming when there was a partial or complete remelting or dissolution of the mineral by magma, which resulted from changes in temperature, pressure, or magma composition?

17th Jan 2020 17:27 UTCKnut Eldjarn Manager

Did you find it on the beach or at a rocky outcrop inland? If on the beach, could it be a coloured coral?? A test with a small grain in hydrochloric acid would reveal if it is a carbonate (i.e.azurite) - BUT a coral would react the same way...
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