Olmsteadite

Olmsteadite with jahnsite

 

Olmsteadite with jahnsite on siderite

Origin: Big Chief mine, Keystone, Pennington Co., South Dakota, U.S.A. (type locality)

Owner: Lou Perloff

Microscopic image

 

Photo courtesy of: 

Photo-Atlas of Minerals

  

 

  

 

  

This particular specimen has a 1mm red grain showing a few crystal faces and eight other grains with two crystals to 0.5mm and less in a matrix of siderite with minor whitmoreite

  

 

  

 

  

 

  

 

 

Origin: Big Chief mine, Pennington Co., South Dakota, United States (type locality)

Sample size: 1 mm (top), 1 mm (2nd row), 15 x 12 x 8 mm (3rd row), 15 x 7 x 5 mm (4th row), 13 x 12 x 10 mm (5th row), 12 x 8 x 5 mm (6th row), 15 x 13 x 10 mm (7th row), 1 mm (8th row), 0.9 x 0.6 x 2 mm (bottom)

 

Photo courtesy of: