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Duncan Miller

The faceting articles published over the past few years in the Mineral Chatter have been compiled into a single 128 page document, available for download for those interested in saving all the articles together. To download the pdf file click here.

A 29,18 ct cuprite from Onganja, Namibia, cut by Duncan Miller and now in a private collection in Germany.

Browsing Archive: June, 2011

Mineral of the Month - Analcime

Posted by Site Moderator Webmaster on Friday, June 24, 2011, In : Mineral of the Month 

Goboboseb crystals showing crystal clear analcime – photos and specimens PdB
NaAlSi2O6-H2O, Hydrated Sodium Aluminium Silicate

The name of the mineral comes from the Greek word analkis that means weak.

Analcime is a zeolite and occurs frequently in basalts and other basic igneous rocks associated with other Zeolites.

Crystal system: triclinic (Pseudo-cubic)

The aluminosilicate framework of the crystal structure does not change in topology at all.  The reduction...

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Mineral of the Month - Cuprite

Posted by Site Moderator Webmaster on Friday, June 24, 2011, In : Mineral of the Month 

Crystal system:                 Isometric                                             Hardness:                        3,5 - 4,0
Density:                               6,15 average                                      Streak:                             Red       
Colour:                                Red to a deep red that can appear almost black.
Cleavage:                            Is fair in four directions forming octahedrons.
Occurrence:                       Oxidized zone of co...

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