MINERALS INDEX
Arseniosiderite |
| Ca4Fe(AsO4)3.3Fe(OH)2 |
The Canfield collection contains specimens, reported as found in the Taylor mine in 1874, which consist of rosettes of a brown, silky-fibrous mineral implanted on a fracture surface of massive franklinite ore. Mr. Canfield believed the mineral to be a new species. The author was unable to identify the mineral from the small amount available, but it has now been identified by Larsen as probably the iron-calcium arsenate, arseniosiderite. The optical characters reported are long laths, red-brown, faintly pleochroic, nearly uniaxial, optically negative, refractive index 1.73 to 1.88.
I am indebted for this information to Mr. E. V. Shannon, formerly of the United States National Museum, who also stated that he had found arsenic in a minute speck tested, thus confirming the determination.
|
|
||
|
Website
© by Herb Yeates 1997-2006.
|
||
|
This
page created: August 12, 2006 5:43 PM
|
||