Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Lazurite Crystal System

Posted by Richard Felicioni  
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)
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}

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)
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.
Pedro Alves January 23, 2012 12:03AM
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.

open | download - lazurite.jpg (37.4 KB)
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)
Sorry, only registered users may post in this forum.

Click here to login

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 20, 2018 07:29:37
Go to top of page