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Techniques for CollectorsLazurite Crystal System

22nd Jan 2012 19:19 UTCRichard Felicioni

I am trying to determine the geometric shape of this Lazurite. I know Lazurite has a Isometric (Cubic) system, but I am having a hard time seeing this shape in this specimen. The Lazurite crystal looks to be a Tetragonal Trapezohedron (Photo: Tetragonal Trapezohedron). I have attached two pictures of the Lazurite (Photos: Lazurite 1 & Lazurite 2) and would appreciate feedback on the geometric shape.

22nd Jan 2012 22:36 UTCPedro Alves Expert

Hello Richard,

in your lazurite2, if I see correctly, there are two forms:

cube{100} and rhombic dodecahedron {110}.


I send you back your pic (lazurite2) with those forms cube (clear blue) and rhombic dodecahedron (deep blue).


I've a question: in 'my' pic, inside the red rectangle, is that a shadow or a face?

If yes (a face), it could be a {hll} form, like {211}


Cheers,

Pedro Alves

22nd Jan 2012 23:49 UTCRichard Felicioni

Wow, thank you. Yes it is a face. There is also a slightly thicker long thin face on the the opposite side. I will take a few additional photos and post them later tonight.

23rd Jan 2012 00:03 UTCPedro Alves Expert

Hi,

look at the image above.

It looks like your crystal, but the angle (in red) should be smaller...

Dunno, i've to spend more time.


Cheers,

Pedro

23rd Jan 2012 02:23 UTCRichard Felicioni

I have added three more photos. Let me know if there is a view I am missing. Thanks again for your input.
 
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