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Roepperite (of Brush)

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Black, greenish black, rarely dark yellow green
Sub-Vitreous, Resinous, Greasy, Dull
5½ - 6
Specific Gravity:
3.95 - 4.08
Member of:
Named in 1872 by George J. Brush in honor of William Theodore Roepper [March 7, 1810 Peilau, Lower Silesia, Germany [now Poland] - March 11, 1880 Bethlehem, Pennsylvania, USA] professor of mineralogy and geology and curator of mineralogy at Lehigh University, Bethlehem, Pennsylvania, USA, noted researcher of Franklin-Ogdensburg, New Jersey minerals and who first described the species. Roepper also discovered the zinc deposits in the Saucon Valley of Pennsylvania.
A variety of Fayalite

A manganoan, zincian fayalite. Black slightly rounded to very rounded crystals, also black cleavages

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Physical Properties of Roepperite (of Brush)Hide

Sub-Vitreous, Resinous, Greasy, Dull
Translucent, Opaque
Black, greenish black, rarely dark yellow green
5½ - 6 on Mohs scale
Hardness Data:
Very Good
3.95 - 4.08 g/cm3 (Measured)    

Chemical Properties of Roepperite (of Brush)Hide


Relationship of Roepperite (of Brush) to other SpeciesHide

Member of:
Other Members of this group:
AsimowiteFe2SiO4Orth. mmm (2/m 2/m 2/m) : Imma
Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
FayaliteFe2+2SiO4Orth. mmm (2/m 2/m 2/m)
ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
GlaucochroiteCaMn2+SiO4Orth. mmm (2/m 2/m 2/m)
KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
LarniteCa2SiO4Mon. 2/m
TephroiteMn2+2SiO4Orth. mmm (2/m 2/m 2/m)

Fluorescence of Roepperite (of Brush)Hide

Not fluorescent in UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Roepperite (of Brush)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Roepper, William Theodore, 1870, Notice of Some Minerals from New Jersey, American Journal of Science, second series, v. 50, p. 35-38.
Brush, George Jarvis, 1872, Roepperite, System of Mineralogy, fifth edition,Appendix I, p. 13.
Brush, George Jarvis, 1872, Stirlingite, Roepperite, American Journal of Science, third series, v4, p. 146.

Internet Links for Roepperite (of Brush)Hide

Localities for Roepperite (of Brush)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Franklin
Dana, Edward S. (1892) System of Mineralogy
        • Ogdensburg
          • Sterling Hill
Dana, Edward S., (1892) System of Mineralogy
Mineral and/or Locality  
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