Hyalite Opal – BULK 032

Description:  Twenty hyalite opal specimens covering various minerals, namely smoky quartz and schorl (crystals and chunks) and pieces of matrix, all measuring between 30 and 75 mm in length.

The hyalite opal fluoresces well under ultraviolet light, as seen in these images (all except one).

Total Weight of Specimens:  612 g 

Chemical Composition:  SiO₂•1.5(H₂O)  (opal)
                                        SiO₂  (quartz)  
                                       NaFe²⁺₃Al₆Si₆O₁₈(BO₃)₃(OH)₄  (schorl)

Hardness on Mohs Scale:  (quartz)  7     
                                          (opal)  5.5-6 
                                         (schorl)  7.5

Location:   Erongo mountains, Namibia, Africa.

Specimen Code:  BULK 032