SCHORL   (TOURMALINE GROUP)
 
Schorl from Erongo, Namibia. Specimens and photo – J de Jongh
 
 
Crystal system:                        trigonal                         Hardness:         7
Density:                                    3.1 - 3.25                      Cleavage:         None
Streak:                                     white                            
Colour:                                       black, brownish ...

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