Rockbridgeite

Rockbridgeite is a phosphate mineral typically occurring as a secondary mineral in phosphate rich environments, primarily of interest to mineral collectors.

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Information about Rockbridgeite

A member of the frondelite-rockbridgeite group, the iron heavy end member.

Uses and History

 

Rockbridgeite has no real industrial uses and is primarily of interest to mineral collectors.

 

 

Named in 1949 by Clifford Frondel for the type locality – the Midvale Mine, Rockbridge County, Virginia, USA.

 

Mineralogy

Chemistry
An anhydrous iron phosphate mineral with the formula Fe2+Fe3+4(PO4)3(OH)5
Colours and Variations
Dark green, olive green, brown, yellow brown, black.
Streak
Green-grey
Luster
Vitreous to dull.
Transparency
Translucent to opaque.
Fracture
Uneven
Crystal habit
Typically fibrous and in crusts, sometimes botryoidal, in druzy.
Mohs hardness
3.5 – 4.5
Fluorescence
Specific Gravity
3.45 – 3.6
Easiest testing method

Hazards and Warnings

 

 

 

Mineral collectors should wash their hands after handling specimens, to avoid any exposure to potential toxins.
Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis. When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.

Translations

Arabic:

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Portuguese:

  • Rockbridgeíta

Bengali:

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Punjabi:

English:

  • Rockbridgeite

Italian:

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French:

Japanese:

  • ロックブリッジ石

Spanish:

  • Rockbridgeíta

German:

  • Rockbridgeit

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Further Reading / External Links

  • https://en.wikipedia.org/wiki/Rockbridgeite
  • https://www.mindat.org/min-3433.html
  • https://handbookofmineralogy.org/pdfs/rockbridgeite.pdf
  • http://webmineral.com/data/Rockbridgeite.shtml