Frondelite

Frondellite and kidwellite
Origin: Sapucaia, Minas Gerais, Brazil
Owner: Lou Perloff
Microscopic image
 
 
Origin: Hagendorf, Bavaria, Germany
Owner: Lou Perloff
Microscopic image
 

Photo courtesy of: 

Lou Perloff

Photo-Atlas of Minerals

 

  
Deep golden brown with a metallic-like luster of frondelite crystals to 1 mm in aggregate covering an area of 1 x 2 cm in a larger vug also containing black robertsite and mitridatite.
Origin: White Elephant mine, Custer Co., South Dakota, United States
Ex. Grenier collection
Sample size: 8 x 6 x 5 cm
 
  
Banded and concentric golden brown, tightly compact, radial, acicular crystals of frondelite. The bands more than likely represent phases between rockbridgeite and frondelite.
Origin: Sapucaia mine, Galileia, Governador Valaderas, Minas Gerais, Brazil
Sample size: 8 x 4 x 3 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Radial fibrous crusts and masses on rock with purple-blue metastrengite
Origin: Sapucaia, Minas Gerais, Brazil (type locality)
Sample size: 6.5 x 8.5 cm
 

Photo courtesy of: 

Diederik Visser

Diederik Visser Minerals & Petrological Services

 

  
  
Origin: Sapucaia, Governador Valadares, Minas Gerais, Brazil
Sample size: 22 x 12 x 23 mm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

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