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Lazurite Crystal System

Posted by Richard Felicioni  
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Richard Felicioni January 22, 2012 07:19PM
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.
open | download - Tetragonal Trapezohedron.png (58.8 KB)
open | download - Lazurite 1.jpg (783.8 KB)
open | download - Lazurite 2.jpg (756.9 KB)
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Pedro Alves January 22, 2012 10:36PM
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



Edited 2 time(s). Last edit at 01/22/2012 10:51PM by Pedro Alves.
open | download - Lazurite 2 cópia.jpg (293.6 KB)
open | download - lazurite.jpg (55.4 KB)
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Richard Felicioni January 22, 2012 11:49PM
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.
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Pedro Alves January 23, 2012 12:03AM
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
open | download - lazurite.jpg (37.4 KB)
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Richard Felicioni January 23, 2012 02:23AM
I have added three more photos. Let me know if there is a view I am missing. Thanks again for your input.
open | download - Lazurite 3.jpg (361.6 KB)
open | download - Lazurite 4.jpg (347.9 KB)
open | download - Lazurite 5.jpg (340.9 KB)
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