Calcioferrite

White nodule of powdery tinticite with darker brown calcioferrite
  
Green nodules to 4 mm in chalky white tinticite
Origin: Bruguers, Barcelona, Spain
Sample size: about 2 cm (top), 3 x 2.5 x 1.5 cm (bottom)
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

 
Pale yellow crystals forming spherical masses in cavities in matrix
Origin: “Klemm’s” Moculta Phosphate Quarry, Angaston, S.A., Australia
Sample size: 2 x 2 cm matrix (top), 1.5 x 2 cm (bottom)
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

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