Roepperite (of Brush)
A variety of Fayalite
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About Roepperite (of Brush)
Formula:
(Fe2+,Mn,Zn)2SiO4
Colour:
Black, greenish black, rarely dark yellow green
Lustre:
Sub-Vitreous, Resinous, Greasy, Dull
Hardness:
5½ - 6
Specific Gravity:
3.95 - 4.08
Name:
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 manganoan, zincian fayalite. Black slightly rounded to very rounded crystals, also black cleavages.
Unique Identifiers
Mindat ID:
43736 (as Roepperite (of Brush))
1458 (as Fayalite)
1458 (as Fayalite)
Long-form identifier:
mindat:1:1:43736:1 (as Roepperite (of Brush))
mindat:1:1:1458:4 (as Fayalite)
mindat:1:1:1458:4 (as Fayalite)
Similar Names
| Roepperite (of Kenngott) | A variety of Calcite | CaCO3 |
Physical Properties of Roepperite (of Brush)
Sub-Vitreous, Resinous, Greasy, Dull
Transparency:
Translucent, Opaque
Colour:
Black, greenish black, rarely dark yellow green
Hardness:
5½ - 6 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Very Good
{010}
{010}
Density:
3.95 - 4.08 g/cm3 (Measured)
Chemistry of Roepperite (of Brush)
Mindat Formula:
(Fe2+,Mn,Zn)2SiO4
Element Weights:
Common Associates
Associations Based on Photo Data:
Fluorescence of Roepperite (of Brush)
Not fluorescent in UV
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Roepperite (of Brush)
mindat.org URL:
https://www.mindat.org/min-43736.html
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References for Roepperite (of Brush)
Reference List:
Localities for Roepperite (of Brush)
Showing 3 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA | |
| Dana et al. (1892) |
| www.fomsnj.org (n.d.) +1 other reference | |
| Dana et al. (1892) |
Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA