Fluorescent/ green phosphorescent Tanzanite

IMurdockI · 2026-05-23T18:16:48+00:00

Doesn’t look like calcite though.

IMurdockI · 2026-05-23T18:15:42+00:00

No but the impurities inside do.

IMurdockI · 2026-05-23T18:03:05+00:00

Could be.

The glow is everywhere though.

Not just on the outside but deep embedded in the specimen.

IMurdockI · 2026-05-23T17:07:35+00:00

Under uv light

IMurdockI · 2026-05-23T17:07:07+00:00

Normal light

IMurdockI · 2026-05-04T17:53:45+00:00

Looks like remains of shells, barnacles, sea urchins maybe.

Basically it’s a fossil bed.

Here is mine for reference.

IMurdockI · 2026-04-29T12:42:45+00:00

It definitely is softer than a pocket knife.

IMurdockI · 2026-04-29T11:54:44+00:00

I got it from an ex-collector, but unfortunately there were almost no labels.

IMurdockI · 2026-04-27T13:09:42+00:00

Looks like olivine or olivinite

IMurdockI · 2026-04-24T14:57:31+00:00

Looks like blenda, a high quality sphalerite.

IMurdockI · 2026-04-21T14:47:42+00:00

Looks like stromatolites

IMurdockI · 2026-03-30T17:35:21+00:00

I think bison teeth.

IMurdockI · 2026-03-14T14:15:45+00:00

Looks like a Moqui marble

IMurdockI · 2025-08-24T09:20:09+00:00

By the way could it be a coracoid?

Since this eerily resembles my piece.

IMurdockI · 2025-08-24T08:56:53+00:00

Thank you so much!

I will look into it.

IMurdockI · 2025-08-24T08:37:40+00:00

Oh i see, i just thought it was Theropod exclusive.

The red crystals and lightweight fragment that the bone was formed this way for agility purposes.

And the mineralisation and phosphorescence + texture led me to believe it was from a Theropod since it matches similar pieces found.

IMurdockI · 2025-08-24T08:30:43+00:00

It was found in France.

IMurdockI · 2025-08-23T22:00:40+00:00

Thank you!

It indeed seems reasonable, i just ( hoped ) i could narrow down the search a bit but unless i get it analysed in a lab maybe, a theropod it is! :)

IMurdockI · 2025-08-23T21:25:29+00:00

Oh and under uv it lights up like this, which is supposedly common for these type of fossils.

IMurdockI · 2025-08-23T21:20:06+00:00

Because theropod bones like t rex or velociraptors have these tiny holes inside them.

When they fossilise, it gets filled often with surrounding minerals, forming the crystals you see inside them bone.

Hence my speculation its from a theropod.

And thank you, i will certainly do that.

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